From e17744faf081a013f38936573a076cf957a3afe6 Mon Sep 17 00:00:00 2001
From: undergroundwires <git@undergroundwires.dev>
Date: Thu, 26 Sep 2024 16:07:37 +0200
Subject: [PATCH] Bump to TypeScript 5.5 and enable `noImplicitAny`

This commit upgrades TypeScript from 5.4 to 5.5 and enables the
`noImplicitAny` option for stricter type checking. It refactors code to
comply with `noImplicitAny` and adapts to new TypeScript features and
limitations.

Key changes:

- Migrate from TypeScript 5.4 to 5.5
- Enable `noImplicitAny` for stricter type checking
- Refactor code to comply with new TypeScript features and limitations

Other supporting changes:

- Refactor progress bar handling for type safety
- Drop 'I' prefix from interfaces to align with new code convention
- Update TypeScript target from `ES2017` and `ES2018`.
  This allows named capturing groups. Otherwise, new TypeScript compiler
  does not compile the project and shows the following error:
  ```
  ...
  TimestampedFilenameGenerator.spec.ts:105:23 - error TS1503: Named capturing groups are only available when targeting 'ES2018' or later
  const pattern = /^(?<timestamp>\d{4}-\d{2}-\d{2}_\d{2}-\d{2}-\d{2})-(?<scriptName>[^.]+?)(?:\.(?<extension>[^.]+))?$/;// timestamp-scriptName.extension
  ...
  ```
- Refactor usage of `electron-progressbar` for type safety and
  less complexity.
---
 package-lock.json                             |  17 +-
 package.json                                  |   2 +-
 src/application/Common/Enum.ts                |  10 +-
 src/application/Context/ApplicationContext.ts |  37 +++-
 .../Parser/Executable/CategoryParser.ts       |   2 +-
 .../Parser/Executable/Script/ScriptParser.ts  |   2 +-
 .../Analyzers/AnalyzeDuplicateLines.ts        |   2 +-
 .../RuntimeSanity/Common/FactoryValidator.ts  |   8 +-
 .../RuntimeSanity/Common/ISanityValidator.ts  |   7 -
 ...yCheckOptions.ts => SanityCheckOptions.ts} |   2 +-
 .../RuntimeSanity/Common/SanityValidator.ts   |   7 +
 .../RuntimeSanity/SanityChecks.ts             |  25 ++-
 .../EnvironmentVariablesValidator.ts          |   4 +-
 .../Validators/WindowVariablesValidator.ts    |   4 +-
 .../bootstrapping/ApplicationBootstrapper.ts  |   4 +-
 .../Modules/RuntimeSanityBootstrapper.ts      |  15 ++
 .../Modules/RuntimeSanityValidator.ts         |  15 --
 .../TreeView/Node/HierarchicalTreeNode.vue    |   4 +-
 .../Tree/TreeView/TreeRoot/TreeRootManager.ts |  12 +-
 .../components/Shared/TooltipWrapper.vue      |  18 +-
 .../electron/main/IpcRegistration.ts          |   3 +-
 .../main/Update/AutomaticUpdateCoordinator.ts |   8 +-
 .../main/Update/ManualUpdater/Downloader.ts   |   2 +-
 .../ManualUpdater/ManualUpdateCoordinator.ts  |   4 +-
 .../ElectronProgressBarWithLifecycle.ts       | 158 ++++++++++++++++++
 .../ProgressBar/ProgressBarWithLifecycle.ts   |  31 ++++
 .../Update/ProgressBar/UpdateProgressBar.ts   |  92 ++++++++++
 .../electron/main/Update/UpdateProgressBar.ts |  95 -----------
 .../ContextBridging/MethodContextBinder.ts    |   5 +-
 .../electron/shared/IpcBridging/IpcProxy.ts   |   4 +-
 .../desktop-runtime-errors/main.spec.ts       |   4 +-
 .../RuntimeSanity/SanityChecks.spec.ts        |   6 +-
 .../Validators/ValidatorTestRunner.ts         |   4 +-
 .../View/Tree/TreeView/TreeView.spec.ts       |   6 +-
 .../Assertions/ExpectDeepThrowsError.ts       |   2 +-
 .../TestCases/SupportedOperatingSystems.ts    |   4 +-
 .../Common/Timing/PlatformTimer.spec.ts       |  15 +-
 .../Context/ApplicationContext.spec.ts        |  58 +++++--
 .../State/CategoryCollectionState.spec.ts     |   2 +-
 .../State/Code/ApplicationCode.spec.ts        |   2 +-
 .../Generation/UserScriptGenerator.spec.ts    |   3 +-
 .../Script/DebouncedScriptSelection.spec.ts   |   2 +-
 .../Parser/Common/TypeValidator.spec.ts       |   4 +-
 .../Parser/Regex/RegexParser.spec.ts          |   2 +-
 .../Expressions/Pipes/PipeFactory.spec.ts     |   3 +-
 .../Pipes/PipelineCompiler.spec.ts            |  10 +-
 .../SyntaxParsers/SyntaxParserTestsRunner.ts  |   2 +-
 .../SyntaxParsers/WithParser.spec.ts          |   6 +-
 .../Analyzers/AnalyzeTooLongLines.spec.ts     |  13 +-
 .../TimestampedFilenameGenerator.spec.ts      |  18 +-
 ...ecificTerminalLaunchCommandFactory.spec.ts |   3 +-
 .../Vite/ViteEnvironmentVariables.spec.ts     |   7 +-
 .../ConditionBasedOsDetector.spec.ts          |   7 +-
 .../WindowVariablesValidator.spec.ts          |  15 +-
 .../RuntimeSanity/SanityChecks.spec.ts        |  14 +-
 .../FactoryValidatorConcreteTestRunner.ts     |  18 +-
 .../bootstrapping/DependencyProvider.spec.ts  |  15 +-
 ...c.ts => RuntimeSanityBootstrapper.spec.ts} |  19 ++-
 .../Steps/PlatformInstructionSteps.spec.ts    |   7 +-
 .../CompositeMarkdownRenderer.spec.ts         |   2 +-
 .../Node/Hierarchy/TreeNodeHierarchy.spec.ts  |   4 +-
 .../Rendering/UseGradualNodeRendering.spec.ts |   2 +-
 .../NodeCollection/TreeInputParser.spec.ts    |   2 +-
 .../Tree/TreeView/TreeRoot/TreeRootManager.ts |  41 ++++-
 .../UseSelectedScriptNodeIds.spec.ts          |   3 +-
 .../UseExpandCollapseAnimation.spec.ts        |   7 +-
 .../Hooks/Clipboard/UseClipboard.spec.ts      |  16 +-
 .../Hooks/UseUserSelectionState.spec.ts       |   7 +-
 .../electron/main/IpcRegistration.spec.ts     |   2 +-
 .../RendererApiProvider.spec.ts               |   2 +-
 .../shared/IpcChannelDefinitions.spec.ts      |   3 +-
 tests/unit/shared/Stubs/ExpressionStub.ts     |   2 +-
 .../shared/Stubs/SanityCheckOptionsStub.ts    |   4 +-
 .../unit/shared/Stubs/SanityValidatorStub.ts  |  10 +-
 .../Stubs/VueDependencyInjectionApiStub.ts    |   2 +-
 tsconfig.json                                 |   3 +-
 vite-config-helper.ts                         |   6 +-
 77 files changed, 656 insertions(+), 332 deletions(-)
 delete mode 100644 src/infrastructure/RuntimeSanity/Common/ISanityValidator.ts
 rename src/infrastructure/RuntimeSanity/Common/{ISanityCheckOptions.ts => SanityCheckOptions.ts} (71%)
 create mode 100644 src/infrastructure/RuntimeSanity/Common/SanityValidator.ts
 create mode 100644 src/presentation/bootstrapping/Modules/RuntimeSanityBootstrapper.ts
 delete mode 100644 src/presentation/bootstrapping/Modules/RuntimeSanityValidator.ts
 create mode 100644 src/presentation/electron/main/Update/ProgressBar/ElectronProgressBarWithLifecycle.ts
 create mode 100644 src/presentation/electron/main/Update/ProgressBar/ProgressBarWithLifecycle.ts
 create mode 100644 src/presentation/electron/main/Update/ProgressBar/UpdateProgressBar.ts
 delete mode 100644 src/presentation/electron/main/Update/UpdateProgressBar.ts
 rename tests/unit/presentation/bootstrapping/Modules/{RuntimeSanityValidator.spec.ts => RuntimeSanityBootstrapper.spec.ts} (60%)

diff --git a/package-lock.json b/package-lock.json
index 9ba6192d..8fbaf00c 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -6,7 +6,7 @@
   "packages": {
     "": {
       "name": "privacy.sexy",
-      "version": "0.13.5",
+      "version": "0.13.6",
       "hasInstallScript": true,
       "dependencies": {
         "@floating-ui/vue": "^1.1.1",
@@ -53,7 +53,7 @@
         "start-server-and-test": "^2.0.4",
         "terser": "^5.31.3",
         "tslib": "^2.6.3",
-        "typescript": "^5.4.5",
+        "typescript": "~5.5.4",
         "vite": "^5.3.4",
         "vitest": "^2.0.3",
         "vue-tsc": "^2.0.26",
@@ -15689,10 +15689,11 @@
       "dev": true
     },
     "node_modules/typescript": {
-      "version": "5.4.5",
-      "resolved": "https://registry.npmjs.org/typescript/-/typescript-5.4.5.tgz",
-      "integrity": "sha512-vcI4UpRgg81oIRUFwR0WSIHKt11nJ7SAVlYNIu+QpqeyXP+gpQJy/Z4+F0aGxSE4MqwjyXvW/TzgkLAx2AGHwQ==",
+      "version": "5.5.4",
+      "resolved": "https://registry.npmjs.org/typescript/-/typescript-5.5.4.tgz",
+      "integrity": "sha512-Mtq29sKDAEYP7aljRgtPOpTvOfbwRWlS6dPRzwjdE+C0R4brX/GUyhHSecbHMFLNBLcJIPt9nl9yG5TZ1weH+Q==",
       "devOptional": true,
+      "license": "Apache-2.0",
       "bin": {
         "tsc": "bin/tsc",
         "tsserver": "bin/tsserver"
@@ -28699,9 +28700,9 @@
       "dev": true
     },
     "typescript": {
-      "version": "5.4.5",
-      "resolved": "https://registry.npmjs.org/typescript/-/typescript-5.4.5.tgz",
-      "integrity": "sha512-vcI4UpRgg81oIRUFwR0WSIHKt11nJ7SAVlYNIu+QpqeyXP+gpQJy/Z4+F0aGxSE4MqwjyXvW/TzgkLAx2AGHwQ==",
+      "version": "5.5.4",
+      "resolved": "https://registry.npmjs.org/typescript/-/typescript-5.5.4.tgz",
+      "integrity": "sha512-Mtq29sKDAEYP7aljRgtPOpTvOfbwRWlS6dPRzwjdE+C0R4brX/GUyhHSecbHMFLNBLcJIPt9nl9yG5TZ1weH+Q==",
       "devOptional": true
     },
     "uc.micro": {
diff --git a/package.json b/package.json
index 91bbfdcb..4e803fe8 100644
--- a/package.json
+++ b/package.json
@@ -78,7 +78,7 @@
     "start-server-and-test": "^2.0.4",
     "terser": "^5.31.3",
     "tslib": "^2.6.3",
-    "typescript": "^5.4.5",
+    "typescript": "~5.5.4",
     "vite": "^5.3.4",
     "vitest": "^2.0.3",
     "vue-tsc": "^2.0.26",
diff --git a/src/application/Common/Enum.ts b/src/application/Common/Enum.ts
index 81b9384a..3688ed44 100644
--- a/src/application/Common/Enum.ts
+++ b/src/application/Common/Enum.ts
@@ -33,23 +33,25 @@ function parseEnumValue<T extends EnumType, TEnumValue extends EnumType>(
   if (!casedValue) {
     throw new Error(`unknown ${enumName}: "${value}"`);
   }
-  return enumVariable[casedValue as keyof typeof enumVariable];
+  return enumVariable[casedValue as keyof EnumVariable<T, TEnumValue>];
 }
 
 export function getEnumNames
 <T extends EnumType, TEnumValue extends EnumType>(
   enumVariable: EnumVariable<T, TEnumValue>,
-): string[] {
+): (string & keyof EnumVariable<T, TEnumValue>)[] {
   return Object
     .values(enumVariable)
-    .filter((enumMember): enumMember is string => isString(enumMember));
+    .filter((
+      enumMember,
+    ): enumMember is string & (keyof EnumVariable<T, TEnumValue>) => isString(enumMember));
 }
 
 export function getEnumValues<T extends EnumType, TEnumValue extends EnumType>(
   enumVariable: EnumVariable<T, TEnumValue>,
 ): TEnumValue[] {
   return getEnumNames(enumVariable)
-    .map((level) => enumVariable[level]) as TEnumValue[];
+    .map((name) => enumVariable[name]) as TEnumValue[];
 }
 
 export function assertInRange<T extends EnumType, TEnumValue extends EnumType>(
diff --git a/src/application/Context/ApplicationContext.ts b/src/application/Context/ApplicationContext.ts
index 4828947a..7c9cd289 100644
--- a/src/application/Context/ApplicationContext.ts
+++ b/src/application/Context/ApplicationContext.ts
@@ -17,7 +17,7 @@ export class ApplicationContext implements IApplicationContext {
   public currentOs: OperatingSystem;
 
   public get state(): ICategoryCollectionState {
-    return this.states[this.collection.os];
+    return this.getState(this.collection.os);
   }
 
   private readonly states: StateMachine;
@@ -26,30 +26,51 @@ export class ApplicationContext implements IApplicationContext {
     public readonly app: IApplication,
     initialContext: OperatingSystem,
   ) {
+    this.setContext(initialContext);
     this.states = initializeStates(app);
-    this.changeContext(initialContext);
   }
 
   public changeContext(os: OperatingSystem): void {
-    assertInRange(os, OperatingSystem);
     if (this.currentOs === os) {
       return;
     }
-    const collection = this.app.getCollection(os);
-    this.collection = collection;
     const event: IApplicationContextChangedEvent = {
-      newState: this.states[os],
-      oldState: this.states[this.currentOs],
+      newState: this.getState(os),
+      oldState: this.getState(this.currentOs),
     };
+    this.setContext(os);
     this.contextChanged.notify(event);
+  }
+
+  private setContext(os: OperatingSystem): void {
+    validateOperatingSystem(os, this.app);
+    this.collection = this.app.getCollection(os);
     this.currentOs = os;
   }
+
+  private getState(os: OperatingSystem): ICategoryCollectionState {
+    const state = this.states.get(os);
+    if (!state) {
+      throw new Error(`Operating system "${OperatingSystem[os]}" state is unknown.`);
+    }
+    return state;
+  }
+}
+
+function validateOperatingSystem(
+  os: OperatingSystem,
+  app: IApplication,
+): void {
+  assertInRange(os, OperatingSystem);
+  if (!app.getSupportedOsList().includes(os)) {
+    throw new Error(`Operating system "${OperatingSystem[os]}" is not supported.`);
+  }
 }
 
 function initializeStates(app: IApplication): StateMachine {
   const machine = new Map<OperatingSystem, ICategoryCollectionState>();
   for (const collection of app.collections) {
-    machine[collection.os] = new CategoryCollectionState(collection);
+    machine.set(collection.os, new CategoryCollectionState(collection));
   }
   return machine;
 }
diff --git a/src/application/Parser/Executable/CategoryParser.ts b/src/application/Parser/Executable/CategoryParser.ts
index 1adba82e..80c7e8b8 100644
--- a/src/application/Parser/Executable/CategoryParser.ts
+++ b/src/application/Parser/Executable/CategoryParser.ts
@@ -82,7 +82,7 @@ function ensureValidCategory(
   });
   validator.assertType((v) => v.assertObject({
     value: category,
-    valueName: `Category '${category.category}'` ?? 'Category',
+    valueName: category.category ? `Category '${category.category}'` : 'Category',
     allowedProperties: [
       'docs', 'children', 'category',
     ],
diff --git a/src/application/Parser/Executable/Script/ScriptParser.ts b/src/application/Parser/Executable/Script/ScriptParser.ts
index 0eaf507c..05e6b8a8 100644
--- a/src/application/Parser/Executable/Script/ScriptParser.ts
+++ b/src/application/Parser/Executable/Script/ScriptParser.ts
@@ -106,7 +106,7 @@ function validateScript(
 ): asserts script is NonNullable<ScriptData> {
   validator.assertType((v) => v.assertObject<CallScriptData & CodeScriptData>({
     value: script,
-    valueName: `Script '${script.name}'` ?? 'Script',
+    valueName: script.name ? `Script '${script.name}'` : 'Script',
     allowedProperties: [
       'name', 'recommend', 'code', 'revertCode', 'call', 'docs',
     ],
diff --git a/src/application/Parser/Executable/Script/Validation/Analyzers/AnalyzeDuplicateLines.ts b/src/application/Parser/Executable/Script/Validation/Analyzers/AnalyzeDuplicateLines.ts
index 06256a1e..b41de254 100644
--- a/src/application/Parser/Executable/Script/Validation/Analyzers/AnalyzeDuplicateLines.ts
+++ b/src/application/Parser/Executable/Script/Validation/Analyzers/AnalyzeDuplicateLines.ts
@@ -15,7 +15,7 @@ export type DuplicateLinesAnalyzer = CodeValidationAnalyzer & {
 export const analyzeDuplicateLines: DuplicateLinesAnalyzer = (
   lines: readonly CodeLine[],
   language: ScriptingLanguage,
-  syntaxFactory = createSyntax,
+  syntaxFactory: SyntaxFactory = createSyntax,
 ) => {
   const syntax = syntaxFactory(language);
   return lines
diff --git a/src/infrastructure/RuntimeSanity/Common/FactoryValidator.ts b/src/infrastructure/RuntimeSanity/Common/FactoryValidator.ts
index 8207d3b1..d6112aed 100644
--- a/src/infrastructure/RuntimeSanity/Common/FactoryValidator.ts
+++ b/src/infrastructure/RuntimeSanity/Common/FactoryValidator.ts
@@ -1,16 +1,16 @@
-import type { ISanityValidator } from './ISanityValidator';
-import type { ISanityCheckOptions } from './ISanityCheckOptions';
+import type { SanityValidator } from './SanityValidator';
+import type { SanityCheckOptions } from './SanityCheckOptions';
 
 export type FactoryFunction<T> = () => T;
 
-export abstract class FactoryValidator<T> implements ISanityValidator {
+export abstract class FactoryValidator<T> implements SanityValidator {
   private readonly factory: FactoryFunction<T>;
 
   protected constructor(factory: FactoryFunction<T>) {
     this.factory = factory;
   }
 
-  public abstract shouldValidate(options: ISanityCheckOptions): boolean;
+  public abstract shouldValidate(options: SanityCheckOptions): boolean;
 
   public abstract name: string;
 
diff --git a/src/infrastructure/RuntimeSanity/Common/ISanityValidator.ts b/src/infrastructure/RuntimeSanity/Common/ISanityValidator.ts
deleted file mode 100644
index 6de0c05b..00000000
--- a/src/infrastructure/RuntimeSanity/Common/ISanityValidator.ts
+++ /dev/null
@@ -1,7 +0,0 @@
-import type { ISanityCheckOptions } from './ISanityCheckOptions';
-
-export interface ISanityValidator {
-  readonly name: string;
-  shouldValidate(options: ISanityCheckOptions): boolean;
-  collectErrors(): Iterable<string>;
-}
diff --git a/src/infrastructure/RuntimeSanity/Common/ISanityCheckOptions.ts b/src/infrastructure/RuntimeSanity/Common/SanityCheckOptions.ts
similarity index 71%
rename from src/infrastructure/RuntimeSanity/Common/ISanityCheckOptions.ts
rename to src/infrastructure/RuntimeSanity/Common/SanityCheckOptions.ts
index 574bc3a8..16a004df 100644
--- a/src/infrastructure/RuntimeSanity/Common/ISanityCheckOptions.ts
+++ b/src/infrastructure/RuntimeSanity/Common/SanityCheckOptions.ts
@@ -1,4 +1,4 @@
-export interface ISanityCheckOptions {
+export interface SanityCheckOptions {
   readonly validateEnvironmentVariables: boolean;
   readonly validateWindowVariables: boolean;
 }
diff --git a/src/infrastructure/RuntimeSanity/Common/SanityValidator.ts b/src/infrastructure/RuntimeSanity/Common/SanityValidator.ts
new file mode 100644
index 00000000..9c3f706e
--- /dev/null
+++ b/src/infrastructure/RuntimeSanity/Common/SanityValidator.ts
@@ -0,0 +1,7 @@
+import type { SanityCheckOptions } from './SanityCheckOptions';
+
+export interface SanityValidator {
+  readonly name: string;
+  shouldValidate(options: SanityCheckOptions): boolean;
+  collectErrors(): Iterable<string>;
+}
diff --git a/src/infrastructure/RuntimeSanity/SanityChecks.ts b/src/infrastructure/RuntimeSanity/SanityChecks.ts
index cc46ec2d..9b9c5bd7 100644
--- a/src/infrastructure/RuntimeSanity/SanityChecks.ts
+++ b/src/infrastructure/RuntimeSanity/SanityChecks.ts
@@ -1,16 +1,23 @@
 import { EnvironmentVariablesValidator } from './Validators/EnvironmentVariablesValidator';
-import type { ISanityCheckOptions } from './Common/ISanityCheckOptions';
-import type { ISanityValidator } from './Common/ISanityValidator';
+import type { SanityCheckOptions } from './Common/SanityCheckOptions';
+import type { SanityValidator } from './Common/SanityValidator';
 
-const DefaultSanityValidators: ISanityValidator[] = [
+const DefaultSanityValidators: SanityValidator[] = [
   new EnvironmentVariablesValidator(),
 ];
 
+export interface RuntimeSanityValidator {
+  (
+    options: SanityCheckOptions,
+    validators?: readonly SanityValidator[],
+  ): void;
+}
+
 /* Helps to fail-fast on errors */
-export function validateRuntimeSanity(
-  options: ISanityCheckOptions,
-  validators: readonly ISanityValidator[] = DefaultSanityValidators,
-): void {
+export const validateRuntimeSanity: RuntimeSanityValidator = (
+  options: SanityCheckOptions,
+  validators: readonly SanityValidator[] = DefaultSanityValidators,
+) => {
   if (!validators.length) {
     throw new Error('missing validators');
   }
@@ -26,9 +33,9 @@ export function validateRuntimeSanity(
   if (errorMessages.length > 0) {
     throw new Error(`Sanity check failed.\n${errorMessages.join('\n---\n')}`);
   }
-}
+};
 
-function getErrorMessage(validator: ISanityValidator): string | undefined {
+function getErrorMessage(validator: SanityValidator): string | undefined {
   const errorMessages = [...validator.collectErrors()];
   if (!errorMessages.length) {
     return undefined;
diff --git a/src/infrastructure/RuntimeSanity/Validators/EnvironmentVariablesValidator.ts b/src/infrastructure/RuntimeSanity/Validators/EnvironmentVariablesValidator.ts
index 8c61d267..4cefe97c 100644
--- a/src/infrastructure/RuntimeSanity/Validators/EnvironmentVariablesValidator.ts
+++ b/src/infrastructure/RuntimeSanity/Validators/EnvironmentVariablesValidator.ts
@@ -1,7 +1,7 @@
 import type { IEnvironmentVariables } from '@/infrastructure/EnvironmentVariables/IEnvironmentVariables';
 import { EnvironmentVariablesFactory } from '@/infrastructure/EnvironmentVariables/EnvironmentVariablesFactory';
 import { FactoryValidator, type FactoryFunction } from '../Common/FactoryValidator';
-import type { ISanityCheckOptions } from '../Common/ISanityCheckOptions';
+import type { SanityCheckOptions } from '../Common/SanityCheckOptions';
 
 export class EnvironmentVariablesValidator extends FactoryValidator<IEnvironmentVariables> {
   constructor(
@@ -14,7 +14,7 @@ export class EnvironmentVariablesValidator extends FactoryValidator<IEnvironment
 
   public override name = 'environment variables';
 
-  public override shouldValidate(options: ISanityCheckOptions): boolean {
+  public override shouldValidate(options: SanityCheckOptions): boolean {
     return options.validateEnvironmentVariables;
   }
 }
diff --git a/src/infrastructure/RuntimeSanity/Validators/WindowVariablesValidator.ts b/src/infrastructure/RuntimeSanity/Validators/WindowVariablesValidator.ts
index 3de64bf0..51132a67 100644
--- a/src/infrastructure/RuntimeSanity/Validators/WindowVariablesValidator.ts
+++ b/src/infrastructure/RuntimeSanity/Validators/WindowVariablesValidator.ts
@@ -1,6 +1,6 @@
 import type { WindowVariables } from '@/infrastructure/WindowVariables/WindowVariables';
 import { FactoryValidator, type FactoryFunction } from '../Common/FactoryValidator';
-import type { ISanityCheckOptions } from '../Common/ISanityCheckOptions';
+import type { SanityCheckOptions } from '../Common/SanityCheckOptions';
 
 export class WindowVariablesValidator extends FactoryValidator<WindowVariables> {
   constructor(factory: FactoryFunction<WindowVariables> = () => window) {
@@ -9,7 +9,7 @@ export class WindowVariablesValidator extends FactoryValidator<WindowVariables>
 
   public override name = 'window variables';
 
-  public override shouldValidate(options: ISanityCheckOptions): boolean {
+  public override shouldValidate(options: SanityCheckOptions): boolean {
     return options.validateWindowVariables;
   }
 }
diff --git a/src/presentation/bootstrapping/ApplicationBootstrapper.ts b/src/presentation/bootstrapping/ApplicationBootstrapper.ts
index 90447a81..a94fec07 100644
--- a/src/presentation/bootstrapping/ApplicationBootstrapper.ts
+++ b/src/presentation/bootstrapping/ApplicationBootstrapper.ts
@@ -1,4 +1,4 @@
-import { RuntimeSanityValidator } from './Modules/RuntimeSanityValidator';
+import { RuntimeSanityBootstrapper } from './Modules/RuntimeSanityBootstrapper';
 import { AppInitializationLogger } from './Modules/AppInitializationLogger';
 import { DependencyBootstrapper } from './Modules/DependencyBootstrapper';
 import { MobileSafariActivePseudoClassEnabler } from './Modules/MobileSafariActivePseudoClassEnabler';
@@ -17,7 +17,7 @@ export class ApplicationBootstrapper implements Bootstrapper {
 
   private static getAllBootstrappers(): Bootstrapper[] {
     return [
-      new RuntimeSanityValidator(),
+      new RuntimeSanityBootstrapper(),
       new DependencyBootstrapper(),
       new AppInitializationLogger(),
       new MobileSafariActivePseudoClassEnabler(),
diff --git a/src/presentation/bootstrapping/Modules/RuntimeSanityBootstrapper.ts b/src/presentation/bootstrapping/Modules/RuntimeSanityBootstrapper.ts
new file mode 100644
index 00000000..79d67497
--- /dev/null
+++ b/src/presentation/bootstrapping/Modules/RuntimeSanityBootstrapper.ts
@@ -0,0 +1,15 @@
+import { validateRuntimeSanity, type RuntimeSanityValidator } from '@/infrastructure/RuntimeSanity/SanityChecks';
+import type { Bootstrapper } from '../Bootstrapper';
+
+export class RuntimeSanityBootstrapper implements Bootstrapper {
+  constructor(private readonly validator: RuntimeSanityValidator = validateRuntimeSanity) {
+
+  }
+
+  public async bootstrap(): Promise<void> {
+    this.validator({
+      validateEnvironmentVariables: true,
+      validateWindowVariables: true,
+    });
+  }
+}
diff --git a/src/presentation/bootstrapping/Modules/RuntimeSanityValidator.ts b/src/presentation/bootstrapping/Modules/RuntimeSanityValidator.ts
deleted file mode 100644
index 3a6adde6..00000000
--- a/src/presentation/bootstrapping/Modules/RuntimeSanityValidator.ts
+++ /dev/null
@@ -1,15 +0,0 @@
-import { validateRuntimeSanity } from '@/infrastructure/RuntimeSanity/SanityChecks';
-import type { Bootstrapper } from '../Bootstrapper';
-
-export class RuntimeSanityValidator implements Bootstrapper {
-  constructor(private readonly validator = validateRuntimeSanity) {
-
-  }
-
-  public async bootstrap(): Promise<void> {
-    this.validator({
-      validateEnvironmentVariables: true,
-      validateWindowVariables: true,
-    });
-  }
-}
diff --git a/src/presentation/components/Scripts/View/Tree/TreeView/Node/HierarchicalTreeNode.vue b/src/presentation/components/Scripts/View/Tree/TreeView/Node/HierarchicalTreeNode.vue
index 5d04c734..add02e84 100644
--- a/src/presentation/components/Scripts/View/Tree/TreeView/Node/HierarchicalTreeNode.vue
+++ b/src/presentation/components/Scripts/View/Tree/TreeView/Node/HierarchicalTreeNode.vue
@@ -39,7 +39,7 @@
           :tree-root="treeRoot"
           :rendering-strategy="renderingStrategy"
         >
-          <template #node-content="slotProps">
+          <template #node-content="slotProps: NodeMetadata">
             <slot name="node-content" v-bind="slotProps" />
           </template>
         </HierarchicalTreeNode>
@@ -55,6 +55,7 @@ import { useCurrentTreeNodes } from '../UseCurrentTreeNodes';
 import { useNodeState } from './UseNodeState';
 import LeafTreeNode from './LeafTreeNode.vue';
 import InteractableNode from './InteractableNode.vue';
+import type { NodeMetadata } from '../../NodeContent/NodeMetadata';
 import type { TreeRoot } from '../TreeRoot/TreeRoot';
 import type { TreeNode, TreeNodeId } from './TreeNode';
 import type { NodeRenderingStrategy } from '../Rendering/Scheduling/NodeRenderingStrategy';
@@ -107,6 +108,7 @@ export default defineComponent({
     );
 
     return {
+      NodeMetadata: Object as PropType<NodeMetadata>,
       renderedNodeIds,
       isExpanded,
       toggleExpand,
diff --git a/src/presentation/components/Scripts/View/Tree/TreeView/TreeRoot/TreeRootManager.ts b/src/presentation/components/Scripts/View/Tree/TreeView/TreeRoot/TreeRootManager.ts
index f2d0b0e9..37b02985 100644
--- a/src/presentation/components/Scripts/View/Tree/TreeView/TreeRoot/TreeRootManager.ts
+++ b/src/presentation/components/Scripts/View/Tree/TreeView/TreeRoot/TreeRootManager.ts
@@ -11,11 +11,17 @@ export class TreeRootManager implements TreeRoot {
 
   constructor(
     collection: TreeNodeCollection = new TreeNodeInitializerAndUpdater(),
-    createFocusManager: (
-      collection: TreeNodeCollection
-    ) => SingleNodeFocusManager = (nodes) => new SingleNodeCollectionFocusManager(nodes),
+    createFocusManager: FocusManagerFactory = (
+      nodes,
+    ) => new SingleNodeCollectionFocusManager(nodes),
   ) {
     this.collection = collection;
     this.focus = createFocusManager(this.collection);
   }
 }
+
+export interface FocusManagerFactory {
+  (
+    collection: TreeNodeCollection
+  ): SingleNodeFocusManager;
+}
diff --git a/src/presentation/components/Shared/TooltipWrapper.vue b/src/presentation/components/Shared/TooltipWrapper.vue
index 2c89e354..cf030e1e 100644
--- a/src/presentation/components/Shared/TooltipWrapper.vue
+++ b/src/presentation/components/Shared/TooltipWrapper.vue
@@ -120,17 +120,15 @@ function getArrowPositionStyles(
   coordinations: Partial<Coords>,
   placement: Placement,
 ): CSSProperties {
-  const style: CSSProperties = {};
-  style.position = 'absolute';
-  const { x, y } = coordinations;
-  if (x) {
-    style.left = `${x}px`;
-  } else if (y) { // either X or Y is calculated
-    style.top = `${y}px`;
-  }
+  const { x, y } = coordinations; // either X or Y is calculated
   const oppositeSide = getCounterpartBoxOffsetProperty(placement);
-  style[oppositeSide.toString()] = `-${ARROW_SIZE_IN_PX}px`;
-  return style;
+  const newStyle: CSSProperties = {
+    [oppositeSide]: `-${ARROW_SIZE_IN_PX}px`,
+    position: 'absolute',
+    left: x ? `${x}px` : undefined,
+    top: y ? `${y}px` : undefined,
+  };
+  return newStyle;
 }
 
 function getCounterpartBoxOffsetProperty(placement: Placement): keyof CSSProperties {
diff --git a/src/presentation/electron/main/IpcRegistration.ts b/src/presentation/electron/main/IpcRegistration.ts
index 490a87d1..ff1cfb38 100644
--- a/src/presentation/electron/main/IpcRegistration.ts
+++ b/src/presentation/electron/main/IpcRegistration.ts
@@ -22,7 +22,8 @@ export function registerAllIpcChannels(
   };
   Object.entries(ipcInstanceCreators).forEach(([name, instanceFactory]) => {
     try {
-      const definition = IpcChannelDefinitions[name];
+      const definitionKey = name as keyof typeof IpcChannelDefinitions;
+      const definition = IpcChannelDefinitions[definitionKey] as IpcChannel<unknown>;
       const instance = instanceFactory();
       registrar(definition, instance);
     } catch (err) {
diff --git a/src/presentation/electron/main/Update/AutomaticUpdateCoordinator.ts b/src/presentation/electron/main/Update/AutomaticUpdateCoordinator.ts
index c235f871..aad1ba16 100644
--- a/src/presentation/electron/main/Update/AutomaticUpdateCoordinator.ts
+++ b/src/presentation/electron/main/Update/AutomaticUpdateCoordinator.ts
@@ -1,6 +1,6 @@
 import { app, dialog } from 'electron/main';
 import { ElectronLogger } from '@/infrastructure/Log/ElectronLogger';
-import { UpdateProgressBar } from './UpdateProgressBar';
+import { UpdateProgressBar } from './ProgressBar/UpdateProgressBar';
 import { getAutoUpdater } from './ElectronAutoUpdaterFactory';
 import type { AppUpdater, UpdateInfo } from 'electron-updater';
 import type { ProgressInfo } from 'electron-builder';
@@ -26,11 +26,13 @@ function startHandlingUpdateProgress(autoUpdater: AppUpdater) {
       So the indeterminate progress will continue until download is finished.
     */
     ElectronLogger.debug('@download-progress@\n', progress);
-    progressBar.showProgress(progress);
+    if (progressBar.isOpen) { // May be closed by the user
+      progressBar.showProgress(progress);
+    }
   });
   autoUpdater.on('update-downloaded', async (info: UpdateInfo) => {
     ElectronLogger.info('@update-downloaded@\n', info);
-    progressBar.close();
+    progressBar.closeIfOpen();
     await handleUpdateDownloaded(autoUpdater);
   });
 }
diff --git a/src/presentation/electron/main/Update/ManualUpdater/Downloader.ts b/src/presentation/electron/main/Update/ManualUpdater/Downloader.ts
index a0356468..2f8fd1cf 100644
--- a/src/presentation/electron/main/Update/ManualUpdater/Downloader.ts
+++ b/src/presentation/electron/main/Update/ManualUpdater/Downloader.ts
@@ -3,7 +3,7 @@ import { unlink, mkdir } from 'node:fs/promises';
 import path from 'node:path';
 import { app } from 'electron/main';
 import { ElectronLogger } from '@/infrastructure/Log/ElectronLogger';
-import { UpdateProgressBar } from '../UpdateProgressBar';
+import { UpdateProgressBar } from '../ProgressBar/UpdateProgressBar';
 import { retryFileSystemAccess } from './RetryFileSystemAccess';
 import type { UpdateInfo } from 'electron-updater';
 import type { ReadableStream } from 'node:stream/web';
diff --git a/src/presentation/electron/main/Update/ManualUpdater/ManualUpdateCoordinator.ts b/src/presentation/electron/main/Update/ManualUpdater/ManualUpdateCoordinator.ts
index 49c99913..c6f6ce16 100644
--- a/src/presentation/electron/main/Update/ManualUpdater/ManualUpdateCoordinator.ts
+++ b/src/presentation/electron/main/Update/ManualUpdater/ManualUpdateCoordinator.ts
@@ -4,7 +4,7 @@ import { GitHubProjectDetails } from '@/domain/Project/GitHubProjectDetails';
 import { Version } from '@/domain/Version';
 import { parseProjectDetails } from '@/application/Parser/ProjectDetailsParser';
 import { OperatingSystem } from '@/domain/OperatingSystem';
-import { UpdateProgressBar } from '../UpdateProgressBar';
+import { UpdateProgressBar } from '../ProgressBar/UpdateProgressBar';
 import {
   promptForManualUpdate, promptInstallerOpenError,
   promptIntegrityCheckFailure, promptDownloadError,
@@ -100,7 +100,7 @@ async function withProgressBar(
 ) {
   const progressBar = new UpdateProgressBar();
   await action(progressBar);
-  progressBar.close();
+  progressBar.closeIfOpen();
 }
 
 async function isIntegrityPreserved(
diff --git a/src/presentation/electron/main/Update/ProgressBar/ElectronProgressBarWithLifecycle.ts b/src/presentation/electron/main/Update/ProgressBar/ElectronProgressBarWithLifecycle.ts
new file mode 100644
index 00000000..c9bc4b88
--- /dev/null
+++ b/src/presentation/electron/main/Update/ProgressBar/ElectronProgressBarWithLifecycle.ts
@@ -0,0 +1,158 @@
+// @ts-expect-error Outdated `@types/electron-progressbar` causes build failure on macOS
+import ProgressBar from 'electron-progressbar';
+import { BrowserWindow } from 'electron/main';
+import { ElectronLogger } from '@/infrastructure/Log/ElectronLogger';
+import type { Logger } from '@/application/Common/Log/Logger';
+import { EventSource } from '@/infrastructure/Events/EventSource';
+import type {
+  InitialProgressBarWindowOptions,
+  ProgressBarUpdater,
+  ProgressBarStatus,
+  ProgressBarUpdateCallback, ProgressBarWithLifecycle,
+} from './ProgressBarWithLifecycle';
+
+/**
+ * It provides a type-safe way to manage `electron-progressbar` instance,
+ * through its lifecycle, ensuring correct usage, state transitions, and cleanup.
+ */
+export class ElectronProgressBarWithLifecycle implements ProgressBarWithLifecycle {
+  private state: ProgressBarWithState = { status: 'closed' };
+
+  public readonly statusChanged = new EventSource<ProgressBarStatus>();
+
+  private readyCallbacks = new Array<ProgressBarUpdateCallback>();
+
+  constructor(
+    private readonly logger: Logger = ElectronLogger,
+  ) { }
+
+  public update(handler: ProgressBarUpdateCallback): void {
+    switch (this.state.status) { // eslint-disable-line default-case
+      case 'closed':
+        // Throwing an error here helps catch bugs early in the development process.
+        throw new Error('Cannot update the progress bar because it is not currently open.');
+      case 'ready':
+        handler(wrapForUpdate(this.state));
+        break;
+      case 'loading':
+        this.readyCallbacks.push(handler);
+        break;
+    }
+  }
+
+  public resetAndOpen(options: InitialProgressBarWindowOptions): void {
+    this.closeIfOpen();
+    const bar = createElectronProgressBar(options);
+    this.state = { status: 'loading', progressBar: bar };
+    bar.on('ready', () => this.handleReadyEvent(bar));
+    bar.on('aborted' /* closed by user */, (value: number) => {
+      this.changeState({ status: 'closed' });
+      this.logger.info(`Progress bar window closed by user. State: ${this.state.status}, Value: ${value}.`);
+    });
+  }
+
+  public closeIfOpen() {
+    if (this.state.status === 'closed') {
+      return;
+    }
+    this.state.progressBar.close();
+    this.changeState({
+      status: 'closed',
+    });
+  }
+
+  private handleReadyEvent(bar: ProgressBar): void {
+    if (this.state.status !== 'loading' || this.state.progressBar !== bar) {
+      // Handle race conditions if `open` called rapidly without closing to avoid leaks
+      this.logger.warn('Unexpected state when handling ready event. Closing the progress bar.');
+      bar.close();
+      return;
+    }
+    const readyBar: ReadyProgressBar = {
+      status: 'ready',
+      progressBar: bar,
+      browserWindow: getWindow(bar),
+    };
+    this.readyCallbacks.forEach((callback) => callback(wrapForUpdate(readyBar)));
+    this.changeState(readyBar);
+  }
+
+  private changeState(newState: ProgressBarWithState): void {
+    if (isSameState(this.state, newState)) {
+      return;
+    }
+    this.readyCallbacks = [];
+    this.state = newState;
+    this.statusChanged.notify(newState.status);
+  }
+}
+
+type ProgressBarWithState = { readonly status: 'closed' }
+| { readonly status: 'loading', readonly progressBar: ProgressBar }
+| ReadyProgressBar;
+
+interface ReadyProgressBar {
+  readonly status: 'ready';
+  readonly progressBar: ProgressBar;
+  readonly browserWindow: BrowserWindow;
+}
+
+function getWindow(bar: ProgressBar): BrowserWindow {
+  // Note: The ProgressBar library does not provide a public method or event
+  // to access the BrowserWindow, so we access the internal `_window` property directly.
+  if (!('_window' in bar)) {
+    throw new Error('Unable to access the progress bar window.');
+  }
+  const browserWindow = bar._window as BrowserWindow; // eslint-disable-line no-underscore-dangle
+  if (!browserWindow) {
+    throw new Error('Missing internal browser window');
+  }
+  return browserWindow;
+}
+
+function isSameState( // eslint-disable-line consistent-return
+  first: ProgressBarWithState,
+  second: ProgressBarWithState,
+): boolean {
+  switch (first.status) { // eslint-disable-line default-case
+    case 'closed':
+      return second.status === 'closed';
+    case 'loading':
+      return second.status === 'loading'
+        && second.progressBar === first.progressBar;
+    case 'ready':
+      return second.status === 'ready'
+        && second.progressBar === first.progressBar
+        && second.browserWindow === first.browserWindow;
+  }
+}
+
+function wrapForUpdate(bar: ReadyProgressBar): ProgressBarUpdater {
+  return {
+    setText: (text: string) => {
+      bar.progressBar.detail = text;
+    },
+    setClosable: (closable: boolean) => {
+      bar.browserWindow.setClosable(closable);
+    },
+    setProgress: (progress: number) => {
+      bar.progressBar.value = progress;
+    },
+  };
+}
+
+function createElectronProgressBar(
+  options: InitialProgressBarWindowOptions,
+): ProgressBar {
+  const bar = new ProgressBar({
+    indeterminate: options.type === 'indeterminate',
+    title: options.title,
+    text: options.initialText,
+  });
+  if (options.type === 'percentile') { // Indeterminate progress bar does not fire `completed` event, see `electron-progressbar` docs
+    bar.on('completed', () => {
+      bar.detail = options.textOnCompleted;
+    });
+  }
+  return bar;
+}
diff --git a/src/presentation/electron/main/Update/ProgressBar/ProgressBarWithLifecycle.ts b/src/presentation/electron/main/Update/ProgressBar/ProgressBarWithLifecycle.ts
new file mode 100644
index 00000000..68c73cd8
--- /dev/null
+++ b/src/presentation/electron/main/Update/ProgressBar/ProgressBarWithLifecycle.ts
@@ -0,0 +1,31 @@
+import type { IEventSource } from '@/infrastructure/Events/IEventSource';
+
+/*
+  Defines interfaces to abstract the progress bar implementation,
+  serving as an anti-corruption layer. This approach allows for
+  flexibility in switching implementations if needed in the future,
+  while maintaining a consistent API for the rest of the application.
+*/
+export interface ProgressBarWithLifecycle {
+  resetAndOpen(options: InitialProgressBarWindowOptions): void;
+  closeIfOpen(): void;
+  update(handler: ProgressBarUpdateCallback): void;
+  readonly statusChanged: IEventSource<ProgressBarStatus>;
+}
+
+export type ProgressBarStatus = 'closed' | 'loading' | 'ready';
+
+export type ProgressBarUpdateCallback = (bar: ProgressBarUpdater) => void;
+
+export interface InitialProgressBarWindowOptions {
+  readonly type: 'indeterminate' | 'percentile';
+  readonly title: string,
+  readonly initialText: string;
+  readonly textOnCompleted: string;
+}
+
+export interface ProgressBarUpdater {
+  setText(text: string): void;
+  setClosable(closable: boolean): void;
+  setProgress(progress: number): void;
+}
diff --git a/src/presentation/electron/main/Update/ProgressBar/UpdateProgressBar.ts b/src/presentation/electron/main/Update/ProgressBar/UpdateProgressBar.ts
new file mode 100644
index 00000000..d750ec76
--- /dev/null
+++ b/src/presentation/electron/main/Update/ProgressBar/UpdateProgressBar.ts
@@ -0,0 +1,92 @@
+import { app } from 'electron/main';
+import { ElectronLogger } from '@/infrastructure/Log/ElectronLogger';
+import type { Logger } from '@/application/Common/Log/Logger';
+import { ElectronProgressBarWithLifecycle } from './ElectronProgressBarWithLifecycle';
+import type { ProgressInfo } from 'electron-builder';
+import type { InitialProgressBarWindowOptions, ProgressBarWithLifecycle } from './ProgressBarWithLifecycle';
+
+export class UpdateProgressBar {
+  private visibilityState: ProgressBarVisibilityState = 'closed';
+
+  constructor(
+    private readonly logger: Logger = ElectronLogger,
+    private readonly currentApp: Electron.App = app,
+    private readonly progressBar: ProgressBarWithLifecycle = new ElectronProgressBarWithLifecycle(),
+  ) {
+    this.progressBar.statusChanged.on((status) => {
+      if (status === 'closed') {
+        this.visibilityState = 'closed';
+      }
+    });
+  }
+
+  public get isOpen(): boolean {
+    return this.visibilityState !== 'closed';
+  }
+
+  public showIndeterminateState() {
+    if (this.visibilityState === 'showingIndeterminate') {
+      return;
+    }
+    this.progressBar.resetAndOpen(createInitialProgressBarWindowOptions('indeterminate', this.currentApp.name));
+    this.visibilityState = 'showingIndeterminate';
+  }
+
+  public showProgress(progress: ProgressInfo) {
+    const percentage = getUpdatePercent(progress);
+    this.showPercentage(percentage);
+  }
+
+  public showPercentage(percentage: number) {
+    if (this.visibilityState !== 'showingPercentile') {
+      this.progressBar.resetAndOpen(createInitialProgressBarWindowOptions('percentile', this.currentApp.name));
+      this.visibilityState = 'showingPercentile';
+    }
+    this.progressBar.update((bar) => {
+      bar.setProgress(percentage);
+      bar.setText(`${percentage}% ...`);
+    });
+  }
+
+  public showError(e: Error) {
+    this.logger.warn(`Error displayed in progress bar. Visibility state: ${this.visibilityState}. Error message: ${e.message}`);
+    if (this.visibilityState === 'closed') {
+      throw new Error('Cannot display error because the progress bar is not visible.');
+    }
+    this.progressBar.update((bar) => {
+      bar.setText('An error occurred while downloading updates.'
+        + `\n${e && e.message ? e.message : e}`);
+      bar.setClosable(true);
+    });
+  }
+
+  public closeIfOpen() {
+    if (this.visibilityState === 'closed') {
+      return;
+    }
+    this.progressBar.closeIfOpen();
+    this.visibilityState = 'closed';
+  }
+}
+
+type ProgressBarVisibilityState = 'closed' | 'showingIndeterminate' | 'showingPercentile';
+
+function getUpdatePercent(progress: ProgressInfo) {
+  let { percent } = progress;
+  if (percent) {
+    percent = Math.round(percent * 100) / 100;
+  }
+  return percent;
+}
+
+function createInitialProgressBarWindowOptions(
+  type: 'indeterminate' | 'percentile',
+  appName: string,
+): InitialProgressBarWindowOptions {
+  return {
+    type,
+    title: `${appName} Update`,
+    initialText: `Downloading ${appName} update...`,
+    textOnCompleted: 'Download completed.',
+  };
+}
diff --git a/src/presentation/electron/main/Update/UpdateProgressBar.ts b/src/presentation/electron/main/Update/UpdateProgressBar.ts
deleted file mode 100644
index 9ee7c025..00000000
--- a/src/presentation/electron/main/Update/UpdateProgressBar.ts
+++ /dev/null
@@ -1,95 +0,0 @@
-import ProgressBar from 'electron-progressbar';
-import { app, BrowserWindow } from 'electron/main';
-import { ElectronLogger } from '@/infrastructure/Log/ElectronLogger';
-import type { ProgressInfo } from 'electron-builder';
-
-export class UpdateProgressBar {
-  private progressBar: ProgressBar | undefined;
-
-  private get innerProgressBarWindow(): BrowserWindow {
-    // eslint-disable-next-line no-underscore-dangle
-    return this.progressBar._window;
-  }
-
-  private showingProgress = false;
-
-  public showIndeterminateState() {
-    this.progressBar?.close();
-    this.progressBar = progressBarFactory.createWithIndeterminateState();
-  }
-
-  public showProgress(progress: ProgressInfo) {
-    const percentage = getUpdatePercent(progress);
-    this.showPercentage(percentage);
-  }
-
-  public showPercentage(percentage: number) {
-    if (!this.showingProgress) { // First time showing progress
-      this.progressBar?.close();
-      this.showingProgress = true;
-      this.progressBar = progressBarFactory.createWithPercentile(percentage);
-    } else {
-      this.progressBar.value = percentage;
-    }
-  }
-
-  public showError(e: Error) {
-    const reportUpdateError = () => {
-      this.progressBar.detail = 'An error occurred while fetching updates.'
-        + `\n${e && e.message ? e.message : e}`;
-      this.innerProgressBarWindow.setClosable(true);
-    };
-    if (this.progressBar?.innerProgressBarWindow) {
-      reportUpdateError();
-    } else {
-      this.progressBar?.on('ready', () => reportUpdateError());
-    }
-  }
-
-  public close() {
-    if (!this.progressBar?.isCompleted()) {
-      this.progressBar?.close();
-    }
-  }
-}
-
-function getUpdatePercent(progress: ProgressInfo) {
-  let { percent } = progress;
-  if (percent) {
-    percent = Math.round(percent * 100) / 100;
-  }
-  return percent;
-}
-
-const progressBarFactory = {
-  createWithIndeterminateState: () => {
-    return new ProgressBar({
-      title: `${app.name} Update`,
-      text: `Downloading ${app.name} update...`,
-    });
-  },
-  createWithPercentile: (initialPercentage: number) => {
-    const progressBar = new ProgressBar({
-      indeterminate: false,
-      title: `${app.name} Update`,
-      text: `Downloading ${app.name} update...`,
-      detail: `${initialPercentage}% ...`,
-      initialValue: initialPercentage,
-    });
-    progressBar
-      .on('completed', () => {
-        progressBar.detail = 'Download completed.';
-      })
-      .on('aborted', (value: number) => {
-        ElectronLogger.info(`Progress aborted... ${value}`);
-      })
-      .on('progress', (value: number) => {
-        progressBar.detail = `${value}% ...`;
-      })
-      .on('ready', () => {
-        // initialValue doesn't set the UI, so this is needed to render it correctly
-        progressBar.value = initialPercentage;
-      });
-    return progressBar;
-  },
-};
diff --git a/src/presentation/electron/preload/ContextBridging/MethodContextBinder.ts b/src/presentation/electron/preload/ContextBridging/MethodContextBinder.ts
index fb530774..96328e7b 100644
--- a/src/presentation/electron/preload/ContextBridging/MethodContextBinder.ts
+++ b/src/presentation/electron/preload/ContextBridging/MethodContextBinder.ts
@@ -43,9 +43,10 @@ function bindMethodsOfObject<T>(obj: T): T {
     if (!prototype.hasOwnProperty.call(obj, property)) {
       return; // Skip properties not directly on the prototype
     }
-    const value = obj[property];
+    const propertyKey = property as keyof (typeof obj);
+    const value = obj[propertyKey];
     if (isFunction(value)) {
-      (obj as object)[property] = value.bind(obj);
+      obj[propertyKey] = value.bind(obj);
     }
   });
   return obj;
diff --git a/src/presentation/electron/shared/IpcBridging/IpcProxy.ts b/src/presentation/electron/shared/IpcBridging/IpcProxy.ts
index 64039fe2..b7ea9f58 100644
--- a/src/presentation/electron/shared/IpcBridging/IpcProxy.ts
+++ b/src/presentation/electron/shared/IpcBridging/IpcProxy.ts
@@ -7,9 +7,9 @@ export function createIpcConsumerProxy<T>(
   channel: IpcChannel<T>,
   electronIpcRenderer: Electron.IpcRenderer = ipcRenderer,
 ): AsyncMethods<T> {
-  const facade: Partial<T> = {};
+  const facade: Partial<AsyncMethods<T>> = {};
   channel.accessibleMembers.forEach((member) => {
-    const functionKey = member as string;
+    const functionKey = member as (keyof T & string);
     const ipcChannel = getIpcChannelIdentifier(channel.namespace, functionKey);
     facade[functionKey] = ((...args: unknown[]) => {
       return electronIpcRenderer.invoke(ipcChannel, ...args);
diff --git a/tests/checks/desktop-runtime-errors/main.spec.ts b/tests/checks/desktop-runtime-errors/main.spec.ts
index 7e49fadf..07de347b 100644
--- a/tests/checks/desktop-runtime-errors/main.spec.ts
+++ b/tests/checks/desktop-runtime-errors/main.spec.ts
@@ -78,10 +78,12 @@ function setCommandLineFlagsFromEnvironmentVariables() {
   };
   Object.entries(flagEnvironmentVariableKeyMappings)
     .forEach(([flag, environmentVariableKey]) => {
+      const flagValue = Number.parseInt(flag, 10) as CommandLineFlag;
+      const flagDefinition = COMMAND_LINE_FLAGS[flagValue];
       if (process.env[environmentVariableKey] !== undefined) {
         process.argv = [
           ...process.argv,
-          COMMAND_LINE_FLAGS[flag],
+          flagDefinition,
         ];
       }
     });
diff --git a/tests/integration/infrastructure/RuntimeSanity/SanityChecks.spec.ts b/tests/integration/infrastructure/RuntimeSanity/SanityChecks.spec.ts
index 53630653..c8671fed 100644
--- a/tests/integration/infrastructure/RuntimeSanity/SanityChecks.spec.ts
+++ b/tests/integration/infrastructure/RuntimeSanity/SanityChecks.spec.ts
@@ -1,5 +1,5 @@
 import { describe } from 'vitest';
-import type { ISanityCheckOptions } from '@/infrastructure/RuntimeSanity/Common/ISanityCheckOptions';
+import type { SanityCheckOptions } from '@/infrastructure/RuntimeSanity/Common/SanityCheckOptions';
 import { validateRuntimeSanity } from '@/infrastructure/RuntimeSanity/SanityChecks';
 import { isBoolean } from '@/TypeHelpers';
 
@@ -21,8 +21,8 @@ describe('SanityChecks', () => {
   });
 });
 
-function generateTestOptions(): ISanityCheckOptions[] {
-  const defaultOptions: ISanityCheckOptions = {
+function generateTestOptions(): SanityCheckOptions[] {
+  const defaultOptions: SanityCheckOptions = {
     validateEnvironmentVariables: true,
     validateWindowVariables: true,
   };
diff --git a/tests/integration/infrastructure/RuntimeSanity/Validators/ValidatorTestRunner.ts b/tests/integration/infrastructure/RuntimeSanity/Validators/ValidatorTestRunner.ts
index 3cb00ee5..23c19515 100644
--- a/tests/integration/infrastructure/RuntimeSanity/Validators/ValidatorTestRunner.ts
+++ b/tests/integration/infrastructure/RuntimeSanity/Validators/ValidatorTestRunner.ts
@@ -1,8 +1,8 @@
 import { it, expect } from 'vitest';
-import type { ISanityValidator } from '@/infrastructure/RuntimeSanity/Common/ISanityValidator';
+import type { SanityValidator } from '@/infrastructure/RuntimeSanity/Common/SanityValidator';
 
 export function itNoErrorsOnCurrentEnvironment(
-  factory: () => ISanityValidator,
+  factory: () => SanityValidator,
 ) {
   it('it does report errors on current environment', () => {
     // arrange
diff --git a/tests/integration/presentation/components/Scripts/View/Tree/TreeView/TreeView.spec.ts b/tests/integration/presentation/components/Scripts/View/Tree/TreeView/TreeView.spec.ts
index 4fcc5fa9..d13e5712 100644
--- a/tests/integration/presentation/components/Scripts/View/Tree/TreeView/TreeView.spec.ts
+++ b/tests/integration/presentation/components/Scripts/View/Tree/TreeView/TreeView.spec.ts
@@ -129,7 +129,11 @@ function createSampleNodes(): TreeInputNodeDataWithMetadata[] {
   ];
 }
 
-function waitForStableDom(rootElement, timeout = 3000, interval = 200): Promise<void> {
+function waitForStableDom(
+  rootElement: Node,
+  timeout = 3000,
+  interval = 200,
+): Promise<void> {
   return new Promise((resolve, reject) => {
     let lastTimeoutId: ReturnType<typeof setTimeout>;
     const observer = new MutationObserver(() => {
diff --git a/tests/shared/Assertions/ExpectDeepThrowsError.ts b/tests/shared/Assertions/ExpectDeepThrowsError.ts
index 99315b32..fd4733ee 100644
--- a/tests/shared/Assertions/ExpectDeepThrowsError.ts
+++ b/tests/shared/Assertions/ExpectDeepThrowsError.ts
@@ -33,7 +33,7 @@ function removeUndefinedProperties(obj: object | undefined): object | undefined
     return obj;
   }
   return Object.keys(obj).reduce((acc, key) => {
-    const value = obj[key];
+    const value = obj[key as keyof (typeof obj)];
     switch (typeof value) {
       case 'object': {
         const cleanValue = removeUndefinedProperties(value); // recurse
diff --git a/tests/shared/TestCases/SupportedOperatingSystems.ts b/tests/shared/TestCases/SupportedOperatingSystems.ts
index 45ed4143..e0ed4d0c 100644
--- a/tests/shared/TestCases/SupportedOperatingSystems.ts
+++ b/tests/shared/TestCases/SupportedOperatingSystems.ts
@@ -4,7 +4,9 @@ export type SupportedOperatingSystem = OperatingSystem.Windows
 | OperatingSystem.Linux
 | OperatingSystem.macOS;
 
-export const AllSupportedOperatingSystems: readonly OperatingSystem[] = [
+export const AllSupportedOperatingSystems: readonly (
+  OperatingSystem & SupportedOperatingSystem
+)[] = [
   OperatingSystem.Windows,
   OperatingSystem.Linux,
   OperatingSystem.macOS,
diff --git a/tests/unit/application/Common/Timing/PlatformTimer.spec.ts b/tests/unit/application/Common/Timing/PlatformTimer.spec.ts
index 61e80c13..7b61220f 100644
--- a/tests/unit/application/Common/Timing/PlatformTimer.spec.ts
+++ b/tests/unit/application/Common/Timing/PlatformTimer.spec.ts
@@ -25,9 +25,10 @@ describe('PlatformTimer', () => {
   describe('setTimeout', () => {
     it('calls the global setTimeout with the provided delay', () => {
       // arrange
+      type Delay = Parameters<typeof setTimeout>[1];
       const expectedDelay = 55;
-      let actualDelay: number | undefined;
-      global.setTimeout = ((_, delay) => {
+      let actualDelay: Delay | undefined;
+      global.setTimeout = ((_: never, delay: Delay) => {
         actualDelay = delay;
       }) as typeof global.setTimeout;
       // act
@@ -37,9 +38,10 @@ describe('PlatformTimer', () => {
     });
     it('calls the global setTimeout with the provided callback', () => {
       // arrange
+      type Callback = Parameters<typeof setTimeout>[0];
       const expectedCallback = () => { /* NOOP */ };
-      let actualCallback: typeof expectedCallback | undefined;
-      global.setTimeout = ((callback) => {
+      let actualCallback: Callback | undefined;
+      global.setTimeout = ((callback: Callback) => {
         actualCallback = callback;
       }) as typeof global.setTimeout;
       // act
@@ -52,8 +54,9 @@ describe('PlatformTimer', () => {
   describe('clearTimeout', () => {
     it('should clear timeout', () => {
       // arrange
-      let actualTimer: ReturnType<typeof PlatformTimer.setTimeout> | undefined;
-      global.clearTimeout = ((timer) => {
+      type Timer = ReturnType<typeof PlatformTimer.setTimeout>;
+      let actualTimer: Timer | undefined;
+      global.clearTimeout = ((timer: Timer) => {
         actualTimer = timer;
       }) as typeof global.clearTimeout;
       const expectedTimer = PlatformTimer.setTimeout(() => { /* NOOP */ }, 1);
diff --git a/tests/unit/application/Context/ApplicationContext.spec.ts b/tests/unit/application/Context/ApplicationContext.spec.ts
index 07264bc4..03f28406 100644
--- a/tests/unit/application/Context/ApplicationContext.spec.ts
+++ b/tests/unit/application/Context/ApplicationContext.spec.ts
@@ -50,16 +50,33 @@ describe('ApplicationContext', () => {
         // assert
         expectEmptyState(sut.state);
       });
-      it('throws when OS is unknown to application', () => {
+      it('rethrows when application cannot provide collection for supported OS', () => {
         // arrange
         const expectedError = 'expected error from application';
-        const applicationStub = new ApplicationStub();
+        const initialOs = OperatingSystem.Android;
+        const targetOs = OperatingSystem.ChromeOS;
+        const context = new ObservableApplicationContextFactory()
+          .withAppContainingCollections(initialOs, targetOs)
+          .withInitialOs(initialOs);
+        // act
+        const sut = context.construct();
+        const { app } = context;
+        app.getCollection = () => { throw new Error(expectedError); };
+        const act = () => sut.changeContext(targetOs);
+        // assert
+        expect(act).to.throw(expectedError);
+      });
+      it('throws when OS state is unknown to application', () => {
+        // arrange
+        const knownOs = OperatingSystem.Android;
+        const unknownOs = OperatingSystem.ChromeOS;
+        const expectedError = `Operating system "${OperatingSystem[unknownOs]}" state is unknown.`;
         const sut = new ObservableApplicationContextFactory()
-          .withApp(applicationStub)
+          .withAppContainingCollections(knownOs)
+          .withInitialOs(knownOs)
           .construct();
         // act
-        applicationStub.getCollection = () => { throw new Error(expectedError); };
-        const act = () => sut.changeContext(OperatingSystem.Android);
+        const act = () => sut.changeContext(unknownOs);
         // assert
         expect(act).to.throw(expectedError);
       });
@@ -181,14 +198,28 @@ describe('ApplicationContext', () => {
         const actual = sut.state.os;
         expect(actual).to.deep.equal(expected);
       });
-      it('throws when OS is unknown to application', () => {
+      it('rethrows when application cannot provide collection for supported OS', () => {
         // arrange
         const expectedError = 'expected error from application';
-        const applicationStub = new ApplicationStub();
-        applicationStub.getCollection = () => { throw new Error(expectedError); };
+        const knownOperatingSystem = OperatingSystem.macOS;
+        const context = new ObservableApplicationContextFactory()
+          .withAppContainingCollections(knownOperatingSystem)
+          .withInitialOs(knownOperatingSystem);
+        const { app } = context;
+        app.getCollection = () => { throw new Error(expectedError); };
+        // act
+        const act = () => context.construct();
+        // assert
+        expect(act).to.throw(expectedError);
+      });
+      it('throws when OS is not supported', () => {
+        // arrange
+        const unknownInitialOperatingSystem = OperatingSystem.BlackBerry10;
+        const expectedError = `Operating system "${OperatingSystem[unknownInitialOperatingSystem]}" is not supported.`;
         // act
         const act = () => new ObservableApplicationContextFactory()
-          .withApp(applicationStub)
+          .withAppContainingCollections(OperatingSystem.Android /* unrelated */)
+          .withInitialOs(unknownInitialOperatingSystem)
           .construct();
         // assert
         expect(act).to.throw(expectedError);
@@ -222,24 +253,24 @@ class ObservableApplicationContextFactory {
 
   private initialOs = ObservableApplicationContextFactory.DefaultOs;
 
-  constructor() {
+  public constructor() {
     this.withAppContainingCollections(ObservableApplicationContextFactory.DefaultOs);
   }
 
   public withAppContainingCollections(
     ...oses: OperatingSystem[]
-  ): ObservableApplicationContextFactory {
+  ): this {
     const collectionValues = oses.map((os) => new CategoryCollectionStub().withOs(os));
     const app = new ApplicationStub().withCollections(...collectionValues);
     return this.withApp(app);
   }
 
-  public withApp(app: IApplication): ObservableApplicationContextFactory {
+  public withApp(app: IApplication): this {
     this.app = app;
     return this;
   }
 
-  public withInitialOs(initialOs: OperatingSystem) {
+  public withInitialOs(initialOs: OperatingSystem): this {
     this.initialOs = initialOs;
     return this;
   }
@@ -250,6 +281,7 @@ class ObservableApplicationContextFactory {
     return sut;
   }
 }
+
 function getDuplicates<T>(list: readonly T[]): T[] {
   return list.filter((item, index) => list.indexOf(item) !== index);
 }
diff --git a/tests/unit/application/Context/State/CategoryCollectionState.spec.ts b/tests/unit/application/Context/State/CategoryCollectionState.spec.ts
index cd91a9e6..26fbed6d 100644
--- a/tests/unit/application/Context/State/CategoryCollectionState.spec.ts
+++ b/tests/unit/application/Context/State/CategoryCollectionState.spec.ts
@@ -74,7 +74,7 @@ describe('CategoryCollectionState', () => {
   describe('selection', () => {
     it('initializes with empty scripts', () => {
       // arrange
-      const expectedScripts = [];
+      const expectedScripts: readonly SelectedScript[] = [];
       let actualScripts: readonly SelectedScript[] | undefined;
       const selectionFactoryMock: SelectionFactory = (_, scripts) => {
         actualScripts = scripts;
diff --git a/tests/unit/application/Context/State/Code/ApplicationCode.spec.ts b/tests/unit/application/Context/State/Code/ApplicationCode.spec.ts
index a555ab7b..f4e3418d 100644
--- a/tests/unit/application/Context/State/Code/ApplicationCode.spec.ts
+++ b/tests/unit/application/Context/State/Code/ApplicationCode.spec.ts
@@ -16,7 +16,7 @@ describe('ApplicationCode', () => {
   describe('ctor', () => {
     it('empty when selection is empty', () => {
       // arrange
-      const selectedScripts = [];
+      const selectedScripts: readonly SelectedScript[] = [];
       const selection = new ScriptSelectionStub()
         .withSelectedScripts(selectedScripts);
       const definition = new ScriptingDefinitionStub();
diff --git a/tests/unit/application/Context/State/Code/Generation/UserScriptGenerator.spec.ts b/tests/unit/application/Context/State/Code/Generation/UserScriptGenerator.spec.ts
index 5a64e98f..440dc112 100644
--- a/tests/unit/application/Context/State/Code/Generation/UserScriptGenerator.spec.ts
+++ b/tests/unit/application/Context/State/Code/Generation/UserScriptGenerator.spec.ts
@@ -7,6 +7,7 @@ import { ScriptingDefinitionStub } from '@tests/unit/shared/Stubs/ScriptingDefin
 import { itEachAbsentStringValue } from '@tests/unit/shared/TestCases/AbsentTests';
 import { expectExists } from '@tests/shared/Assertions/ExpectExists';
 import { SelectedScriptStub } from '@tests/unit/shared/Stubs/SelectedScriptStub';
+import type { SelectedScript } from '@/application/Context/State/Selection/Script/SelectedScript';
 
 describe('UserScriptGenerator', () => {
   describe('scriptingDefinition', () => {
@@ -143,7 +144,7 @@ describe('UserScriptGenerator', () => {
     it('without script; returns empty', () => {
       // arrange
       const sut = new UserScriptGenerator();
-      const selectedScripts = [];
+      const selectedScripts: readonly SelectedScript[] = [];
       const definition = new ScriptingDefinitionStub();
       // act
       const actual = sut.buildCode(selectedScripts, definition);
diff --git a/tests/unit/application/Context/State/Selection/Script/DebouncedScriptSelection.spec.ts b/tests/unit/application/Context/State/Selection/Script/DebouncedScriptSelection.spec.ts
index b0ef2cdc..2a389baf 100644
--- a/tests/unit/application/Context/State/Selection/Script/DebouncedScriptSelection.spec.ts
+++ b/tests/unit/application/Context/State/Selection/Script/DebouncedScriptSelection.spec.ts
@@ -279,7 +279,7 @@ describe('DebouncedScriptSelection', () => {
     it('throws error when an empty script array is passed', () => {
       // arrange
       const expectedError = 'Provided script array is empty. To deselect all scripts, please use the deselectAll() method instead.';
-      const scripts = [];
+      const scripts: readonly Script[] = [];
       const scriptSelection = new DebouncedScriptSelectionBuilder().build();
       // act
       const act = () => scriptSelection.selectOnly(scripts);
diff --git a/tests/unit/application/Parser/Common/TypeValidator.spec.ts b/tests/unit/application/Parser/Common/TypeValidator.spec.ts
index 410d55c9..374295ba 100644
--- a/tests/unit/application/Parser/Common/TypeValidator.spec.ts
+++ b/tests/unit/application/Parser/Common/TypeValidator.spec.ts
@@ -135,7 +135,7 @@ describe('createTypeValidator', () => {
       });
       it('throws error for empty collection', () => {
         // arrange
-        const emptyArrayValue = [];
+        const emptyArrayValue: unknown[] = [];
         const valueName = 'empty collection value';
         const expectedMessage = `'${valueName}' cannot be an empty array.`;
         const { assertNonEmptyCollection } = createTypeValidator();
@@ -251,7 +251,7 @@ describe('createTypeValidator', () => {
 });
 
 function createObjectWithProperties(properties: readonly string[]): object {
-  const object = {};
+  const object: Record<string, unknown> = {};
   properties.forEach((propertyName) => {
     object[propertyName] = 'arbitrary value';
   });
diff --git a/tests/unit/application/Parser/Executable/Script/Compiler/Expressions/Parser/Regex/RegexParser.spec.ts b/tests/unit/application/Parser/Executable/Script/Compiler/Expressions/Parser/Regex/RegexParser.spec.ts
index ce2f28d0..45db52ae 100644
--- a/tests/unit/application/Parser/Executable/Script/Compiler/Expressions/Parser/Regex/RegexParser.spec.ts
+++ b/tests/unit/application/Parser/Executable/Script/Compiler/Expressions/Parser/Regex/RegexParser.spec.ts
@@ -383,7 +383,7 @@ function createExpressionFactorySpy() {
   };
   return {
     createExpression,
-    getInitParameters: (expression) => createdExpressions.get(expression),
+    getInitParameters: (expression: IExpression) => createdExpressions.get(expression),
   };
 }
 
diff --git a/tests/unit/application/Parser/Executable/Script/Compiler/Expressions/Pipes/PipeFactory.spec.ts b/tests/unit/application/Parser/Executable/Script/Compiler/Expressions/Pipes/PipeFactory.spec.ts
index f5222ecd..b9fc80c6 100644
--- a/tests/unit/application/Parser/Executable/Script/Compiler/Expressions/Pipes/PipeFactory.spec.ts
+++ b/tests/unit/application/Parser/Executable/Script/Compiler/Expressions/Pipes/PipeFactory.spec.ts
@@ -2,6 +2,7 @@ import { describe, it, expect } from 'vitest';
 import { PipeFactory } from '@/application/Parser/Executable/Script/Compiler/Expressions/Pipes/PipeFactory';
 import { PipeStub } from '@tests/unit/shared/Stubs/PipeStub';
 import { getAbsentStringTestCases } from '@tests/unit/shared/TestCases/AbsentTests';
+import type { Pipe } from '@/application/Parser/Executable/Script/Compiler/Expressions/Pipes/Pipe';
 
 describe('PipeFactory', () => {
   describe('ctor', () => {
@@ -49,7 +50,7 @@ describe('PipeFactory', () => {
       // arrange
       const missingName = 'missingName';
       const expectedError = `Unknown pipe: "${missingName}"`;
-      const pipes = [];
+      const pipes: readonly Pipe[] = [];
       const sut = new PipeFactory(pipes);
       // act
       const act = () => sut.get(missingName);
diff --git a/tests/unit/application/Parser/Executable/Script/Compiler/Expressions/Pipes/PipelineCompiler.spec.ts b/tests/unit/application/Parser/Executable/Script/Compiler/Expressions/Pipes/PipelineCompiler.spec.ts
index 381318b6..9b886799 100644
--- a/tests/unit/application/Parser/Executable/Script/Compiler/Expressions/Pipes/PipelineCompiler.spec.ts
+++ b/tests/unit/application/Parser/Executable/Script/Compiler/Expressions/Pipes/PipelineCompiler.spec.ts
@@ -9,20 +9,20 @@ import { getAbsentStringTestCases } from '@tests/unit/shared/TestCases/AbsentTes
 describe('PipelineCompiler', () => {
   describe('compile', () => {
     describe('throws for invalid arguments', () => {
-      interface ITestCase {
+      interface ThrowingPipeScenario {
         readonly name: string;
         readonly act: (test: PipelineTestRunner) => PipelineTestRunner;
         readonly expectedError: string;
       }
-      const testCases: ITestCase[] = [
+      const testScenarios: ThrowingPipeScenario[] = [
         ...getAbsentStringTestCases({ excludeNull: true, excludeUndefined: true })
-          .map((testCase) => ({
+          .map((testCase): ThrowingPipeScenario => ({
             name: `"value" is ${testCase.valueName}`,
             act: (test) => test.withValue(testCase.absentValue),
             expectedError: 'missing value',
           })),
         ...getAbsentStringTestCases({ excludeNull: true, excludeUndefined: true })
-          .map((testCase) => ({
+          .map((testCase): ThrowingPipeScenario => ({
             name: `"pipeline" is ${testCase.valueName}`,
             act: (test) => test.withPipeline(testCase.absentValue),
             expectedError: 'missing pipeline',
@@ -33,7 +33,7 @@ describe('PipelineCompiler', () => {
           expectedError: 'pipeline does not start with pipe',
         },
       ];
-      for (const testCase of testCases) {
+      for (const testCase of testScenarios) {
         it(testCase.name, () => {
           // act
           const runner = new PipelineTestRunner();
diff --git a/tests/unit/application/Parser/Executable/Script/Compiler/Expressions/SyntaxParsers/SyntaxParserTestsRunner.ts b/tests/unit/application/Parser/Executable/Script/Compiler/Expressions/SyntaxParsers/SyntaxParserTestsRunner.ts
index 0eba4c84..27ec8ffe 100644
--- a/tests/unit/application/Parser/Executable/Script/Compiler/Expressions/SyntaxParsers/SyntaxParserTestsRunner.ts
+++ b/tests/unit/application/Parser/Executable/Script/Compiler/Expressions/SyntaxParsers/SyntaxParserTestsRunner.ts
@@ -114,7 +114,7 @@ export class SyntaxParserTestsRunner {
   }
 }
 
-interface ExpectResultTestScenario {
+export interface ExpectResultTestScenario {
   readonly name: string;
   readonly code: string;
   readonly args: (
diff --git a/tests/unit/application/Parser/Executable/Script/Compiler/Expressions/SyntaxParsers/WithParser.spec.ts b/tests/unit/application/Parser/Executable/Script/Compiler/Expressions/SyntaxParsers/WithParser.spec.ts
index 99fa809a..5327833f 100644
--- a/tests/unit/application/Parser/Executable/Script/Compiler/Expressions/SyntaxParsers/WithParser.spec.ts
+++ b/tests/unit/application/Parser/Executable/Script/Compiler/Expressions/SyntaxParsers/WithParser.spec.ts
@@ -2,7 +2,7 @@ import { describe } from 'vitest';
 import { ExpressionPosition } from '@/application/Parser/Executable/Script/Compiler/Expressions/Expression/ExpressionPosition';
 import { WithParser } from '@/application/Parser/Executable/Script/Compiler/Expressions/SyntaxParsers/WithParser';
 import { getAbsentStringTestCases } from '@tests/unit/shared/TestCases/AbsentTests';
-import { SyntaxParserTestsRunner } from './SyntaxParserTestsRunner';
+import { SyntaxParserTestsRunner, type ExpectResultTestScenario } from './SyntaxParserTestsRunner';
 
 describe('WithParser', () => {
   const sut = new WithParser();
@@ -120,7 +120,7 @@ describe('WithParser', () => {
       describe('does not render scope', () => {
         runner.expectResults(
           ...getAbsentStringTestCases({ excludeNull: true, excludeUndefined: true })
-            .map((testCase) => ({
+            .map((testCase): ExpectResultTestScenario => ({
               name: `does not render when value is "${testCase.valueName}"`,
               code: '{{ with $parameter }}dark{{ end }} ',
               args: (args) => args
@@ -138,7 +138,7 @@ describe('WithParser', () => {
       describe('renders scope', () => {
         runner.expectResults(
           ...getAbsentStringTestCases({ excludeNull: true, excludeUndefined: true })
-            .map((testCase) => ({
+            .map((testCase): ExpectResultTestScenario => ({
               name: `does not render when value is "${testCase.valueName}"`,
               code: '{{ with $parameter }}dark{{ end }} ',
               args: (args) => args
diff --git a/tests/unit/application/Parser/Executable/Script/Validation/Analyzers/AnalyzeTooLongLines.spec.ts b/tests/unit/application/Parser/Executable/Script/Validation/Analyzers/AnalyzeTooLongLines.spec.ts
index ad3d2413..e9e79730 100644
--- a/tests/unit/application/Parser/Executable/Script/Validation/Analyzers/AnalyzeTooLongLines.spec.ts
+++ b/tests/unit/application/Parser/Executable/Script/Validation/Analyzers/AnalyzeTooLongLines.spec.ts
@@ -165,11 +165,14 @@ function createScriptLanguageScenarios(): readonly ScriptLanguageScenario[] {
     [ScriptingLanguage.batchfile]: 8191,
     [ScriptingLanguage.shellscript]: 1048576,
   };
-  return Object.entries(maxLengths).map(([language, length]): ScriptLanguageScenario => ({
-    description: `${ScriptingLanguage[language]} (max: ${length})`,
-    language: Number.parseInt(language, 10) as ScriptingLanguage,
-    maxLength: length,
-  }));
+  return Object.entries(maxLengths).map(([language, length]): ScriptLanguageScenario => {
+    const languageValue = Number.parseInt(language, 10) as ScriptingLanguage;
+    return {
+      description: `${ScriptingLanguage[languageValue]} (max: ${length})`,
+      language: languageValue,
+      maxLength: length,
+    };
+  });
 }
 
 class TestContext {
diff --git a/tests/unit/infrastructure/CodeRunner/Creation/Filename/TimestampedFilenameGenerator.spec.ts b/tests/unit/infrastructure/CodeRunner/Creation/Filename/TimestampedFilenameGenerator.spec.ts
index ff2a3c21..302896e4 100644
--- a/tests/unit/infrastructure/CodeRunner/Creation/Filename/TimestampedFilenameGenerator.spec.ts
+++ b/tests/unit/infrastructure/CodeRunner/Creation/Filename/TimestampedFilenameGenerator.spec.ts
@@ -37,9 +37,9 @@ describe('TimestampedFilenameGenerator', () => {
       // act
       const filename = generateFilenamePartsForTesting({ date });
       // assert
-      expect(filename.timestamp).to.equal(expectedTimestamp, formatAssertionMessage[
-        `Generated filename: ${filename.generatedFilename}`
-      ]);
+      expect(filename.timestamp).to.equal(expectedTimestamp, formatAssertionMessage([
+        `Generated filename: ${filename.generatedFilename}`,
+      ]));
     });
     describe('extension', () => {
       it('uses correct extension', () => {
@@ -48,9 +48,9 @@ describe('TimestampedFilenameGenerator', () => {
         // act
         const filename = generateFilenamePartsForTesting({ extension: expectedExtension });
         // assert
-        expect(filename.extension).to.equal(expectedExtension, formatAssertionMessage[
-          `Generated filename: ${filename.generatedFilename}`
-        ]);
+        expect(filename.extension).to.equal(expectedExtension, formatAssertionMessage([
+          `Generated filename: ${filename.generatedFilename}`,
+        ]));
       });
       describe('handles absent extension', () => {
         itEachAbsentStringValue((absentExtension) => {
@@ -59,9 +59,9 @@ describe('TimestampedFilenameGenerator', () => {
           // act
           const filename = generateFilenamePartsForTesting({ extension: absentExtension });
           // assert
-          expect(filename.extension).to.equal(expectedExtension, formatAssertionMessage[
-            `Generated file name: ${filename.generatedFilename}`
-          ]);
+          expect(filename.extension).to.equal(expectedExtension, formatAssertionMessage([
+            `Generated file name: ${filename.generatedFilename}`,
+          ]));
         }, { excludeNull: true });
       });
       it('errors on dot-starting extension', () => {
diff --git a/tests/unit/infrastructure/CodeRunner/Execution/CommandDefinition/Factory/OsSpecificTerminalLaunchCommandFactory.spec.ts b/tests/unit/infrastructure/CodeRunner/Execution/CommandDefinition/Factory/OsSpecificTerminalLaunchCommandFactory.spec.ts
index 9976e61a..54a1936d 100644
--- a/tests/unit/infrastructure/CodeRunner/Execution/CommandDefinition/Factory/OsSpecificTerminalLaunchCommandFactory.spec.ts
+++ b/tests/unit/infrastructure/CodeRunner/Execution/CommandDefinition/Factory/OsSpecificTerminalLaunchCommandFactory.spec.ts
@@ -17,7 +17,8 @@ describe('OsSpecificTerminalLaunchCommandFactory', () => {
       [OperatingSystem.Linux]: LinuxVisibleTerminalCommand,
       [OperatingSystem.macOS]: MacOsVisibleTerminalCommand,
     };
-    AllSupportedOperatingSystems.forEach((operatingSystem) => {
+    AllSupportedOperatingSystems.forEach((operatingSystemValue) => {
+      const operatingSystem = operatingSystemValue as SupportedOperatingSystem;
       it(`${OperatingSystem[operatingSystem]}`, () => {
         // arrange
         const expectedDefinitionType = testScenarios[operatingSystem];
diff --git a/tests/unit/infrastructure/EnvironmentVariables/Vite/ViteEnvironmentVariables.spec.ts b/tests/unit/infrastructure/EnvironmentVariables/Vite/ViteEnvironmentVariables.spec.ts
index f9f4dad2..d6870224 100644
--- a/tests/unit/infrastructure/EnvironmentVariables/Vite/ViteEnvironmentVariables.spec.ts
+++ b/tests/unit/infrastructure/EnvironmentVariables/Vite/ViteEnvironmentVariables.spec.ts
@@ -8,7 +8,7 @@ import { ViteEnvironmentVariables } from '@/infrastructure/EnvironmentVariables/
 
 describe('ViteEnvironmentVariables', () => {
   describe('reads values from import.meta.env', () => {
-    let originalMetaEnv;
+    let originalMetaEnv: ImportMetaEnv;
     beforeEach(() => {
       originalMetaEnv = { ...import.meta.env };
     });
@@ -16,14 +16,15 @@ describe('ViteEnvironmentVariables', () => {
       Object.assign(import.meta.env, originalMetaEnv);
     });
 
-    interface ITestCase<T> {
+    interface EnvironmentVariableTestScenario<T> {
       readonly getActualValue: (sut: IEnvironmentVariables) => T;
       readonly environmentVariable: typeof VITE_ENVIRONMENT_KEYS[
         keyof typeof VITE_ENVIRONMENT_KEYS];
       readonly expected: T;
     }
     const testCases: {
-      readonly [K in PropertyKeys<IEnvironmentVariables>]: ITestCase<string | boolean>;
+      readonly [K in PropertyKeys<IEnvironmentVariables>]:
+      EnvironmentVariableTestScenario<string | boolean>;
     } = {
       name: {
         environmentVariable: VITE_ENVIRONMENT_KEYS.NAME,
diff --git a/tests/unit/infrastructure/RuntimeEnvironment/Browser/BrowserOs/ConditionBasedOsDetector.spec.ts b/tests/unit/infrastructure/RuntimeEnvironment/Browser/BrowserOs/ConditionBasedOsDetector.spec.ts
index 0f5fa7af..de35ecdf 100644
--- a/tests/unit/infrastructure/RuntimeEnvironment/Browser/BrowserOs/ConditionBasedOsDetector.spec.ts
+++ b/tests/unit/infrastructure/RuntimeEnvironment/Browser/BrowserOs/ConditionBasedOsDetector.spec.ts
@@ -119,14 +119,15 @@ describe('ConditionBasedOsDetector', () => {
     });
 
     describe('user agent checks', () => {
-      const testScenarios: ReadonlyArray<{
+      interface UserAgentTestScenario {
         readonly description: string;
         readonly buildEnvironment: (environment: BrowserEnvironmentStub) => BrowserEnvironmentStub;
         readonly buildCondition: (condition: BrowserConditionStub) => BrowserConditionStub;
         readonly detects: boolean;
-      }> = [
+      }
+      const testScenarios: ReadonlyArray<UserAgentTestScenario> = [
         ...getAbsentStringTestCases({ excludeUndefined: true, excludeNull: true })
-          .map((testCase) => ({
+          .map((testCase): UserAgentTestScenario => ({
             description: `does not detect when user agent is empty (${testCase.valueName})`,
             buildEnvironment: (environment) => environment.withUserAgent(testCase.absentValue),
             buildCondition: (condition) => condition,
diff --git a/tests/unit/infrastructure/RuntimeEnvironment/WindowVariablesValidator.spec.ts b/tests/unit/infrastructure/RuntimeEnvironment/WindowVariablesValidator.spec.ts
index f9d14c35..84610a1a 100644
--- a/tests/unit/infrastructure/RuntimeEnvironment/WindowVariablesValidator.spec.ts
+++ b/tests/unit/infrastructure/RuntimeEnvironment/WindowVariablesValidator.spec.ts
@@ -77,7 +77,8 @@ describe('WindowVariablesValidator', () => {
     });
 
     describe('does not throw when a property is valid', () => {
-      const testScenarios: Record<PropertyKeys<Required<WindowVariables>>, ReadonlyArray<{
+      type WindowVariable = PropertyKeys<Required<WindowVariables>>;
+      const testScenarios: Record<WindowVariable, ReadonlyArray<{
         readonly description: string;
         readonly validValue: unknown;
       }>> = {
@@ -117,8 +118,10 @@ describe('WindowVariablesValidator', () => {
           validValueScenarios.forEach(({ description, validValue }) => {
             it(description, () => {
               // arrange
-              const input = new WindowVariablesStub();
-              input[propertyKey] = validValue;
+              const input: WindowVariables = {
+                ...new WindowVariablesStub(),
+                [propertyKey]: validValue,
+              };
               const context = new ValidateWindowVariablesTestSetup()
                 .withWindowVariables(input);
               // act
@@ -173,8 +176,10 @@ describe('WindowVariablesValidator', () => {
                 name: propertyKey as keyof WindowVariables,
                 value: invalidValue,
               });
-              const input = new WindowVariablesStub();
-              input[propertyKey] = invalidValue;
+              const input: WindowVariables = {
+                ...new WindowVariablesStub(),
+                [propertyKey]: invalidValue,
+              };
               const context = new ValidateWindowVariablesTestSetup()
                 .withWindowVariables(input);
               // act
diff --git a/tests/unit/infrastructure/RuntimeSanity/SanityChecks.spec.ts b/tests/unit/infrastructure/RuntimeSanity/SanityChecks.spec.ts
index b1f21f47..a544b4f8 100644
--- a/tests/unit/infrastructure/RuntimeSanity/SanityChecks.spec.ts
+++ b/tests/unit/infrastructure/RuntimeSanity/SanityChecks.spec.ts
@@ -1,8 +1,8 @@
 import { describe, it, expect } from 'vitest';
 import { validateRuntimeSanity } from '@/infrastructure/RuntimeSanity/SanityChecks';
-import type { ISanityCheckOptions } from '@/infrastructure/RuntimeSanity/Common/ISanityCheckOptions';
+import type { SanityCheckOptions } from '@/infrastructure/RuntimeSanity/Common/SanityCheckOptions';
 import { SanityCheckOptionsStub } from '@tests/unit/shared/Stubs/SanityCheckOptionsStub';
-import type { ISanityValidator } from '@/infrastructure/RuntimeSanity/Common/ISanityValidator';
+import type { SanityValidator } from '@/infrastructure/RuntimeSanity/Common/SanityValidator';
 import { SanityValidatorStub } from '@tests/unit/shared/Stubs/SanityValidatorStub';
 import { itEachAbsentCollectionValue } from '@tests/unit/shared/TestCases/AbsentTests';
 import { collectExceptionMessage } from '@tests/unit/shared/ExceptionCollector';
@@ -11,7 +11,7 @@ describe('SanityChecks', () => {
   describe('validateRuntimeSanity', () => {
     describe('parameter validation', () => {
       describe('throws when validators are empty', () => {
-        itEachAbsentCollectionValue<ISanityValidator>((absentCollection) => {
+        itEachAbsentCollectionValue<SanityValidator>((absentCollection) => {
           // arrange
           const expectedError = 'missing validators';
           const validators = absentCollection;
@@ -138,9 +138,9 @@ describe('SanityChecks', () => {
 });
 
 class TestContext {
-  private options: ISanityCheckOptions = new SanityCheckOptionsStub();
+  private options: SanityCheckOptions = new SanityCheckOptionsStub();
 
-  private validators: ISanityValidator[] = [new SanityValidatorStub()];
+  private validators: SanityValidator[] = [new SanityValidatorStub()];
 
   public withOptionsSetup(
     setup: (stub: SanityCheckOptionsStub) => SanityCheckOptionsStub,
@@ -148,12 +148,12 @@ class TestContext {
     return this.withOptions(setup(new SanityCheckOptionsStub()));
   }
 
-  public withOptions(options: ISanityCheckOptions): this {
+  public withOptions(options: SanityCheckOptions): this {
     this.options = options;
     return this;
   }
 
-  public withValidators(validators: ISanityValidator[]): this {
+  public withValidators(validators: SanityValidator[]): this {
     this.validators = validators;
     return this;
   }
diff --git a/tests/unit/infrastructure/RuntimeSanity/Validators/FactoryValidatorConcreteTestRunner.ts b/tests/unit/infrastructure/RuntimeSanity/Validators/FactoryValidatorConcreteTestRunner.ts
index 1ecc1423..cd0c2e0d 100644
--- a/tests/unit/infrastructure/RuntimeSanity/Validators/FactoryValidatorConcreteTestRunner.ts
+++ b/tests/unit/infrastructure/RuntimeSanity/Validators/FactoryValidatorConcreteTestRunner.ts
@@ -1,23 +1,23 @@
 import type { PropertyKeys } from '@/TypeHelpers';
 import type { FactoryFunction, FactoryValidator } from '@/infrastructure/RuntimeSanity/Common/FactoryValidator';
-import type { ISanityCheckOptions } from '@/infrastructure/RuntimeSanity/Common/ISanityCheckOptions';
+import type { SanityCheckOptions } from '@/infrastructure/RuntimeSanity/Common/SanityCheckOptions';
 import { SanityCheckOptionsStub } from '@tests/unit/shared/Stubs/SanityCheckOptionsStub';
 
-interface ITestOptions<T> {
-  createValidator: (factory?: FactoryFunction<T>) => FactoryValidator<T>;
-  enablingOptionProperty: PropertyKeys<ISanityCheckOptions>;
-  factoryFunctionStub: FactoryFunction<T>;
-  expectedValidatorName: string;
+interface TestOptions<T> {
+  readonly createValidator: (factory?: FactoryFunction<T>) => FactoryValidator<T>;
+  readonly enablingOptionProperty: PropertyKeys<SanityCheckOptions>;
+  readonly factoryFunctionStub: FactoryFunction<T>;
+  readonly expectedValidatorName: string;
 }
 
 export function runFactoryValidatorTests<T>(
-  testOptions: ITestOptions<T>,
+  testOptions: TestOptions<T>,
 ) {
   describe('shouldValidate', () => {
     it('returns true when option is true', () => {
       // arrange
       const expectedValue = true;
-      const options: ISanityCheckOptions = {
+      const options: SanityCheckOptions = {
         ...new SanityCheckOptionsStub(),
         [testOptions.enablingOptionProperty]: true,
       };
@@ -31,7 +31,7 @@ export function runFactoryValidatorTests<T>(
     it('returns false when option is false', () => {
       // arrange
       const expectedValue = false;
-      const options: ISanityCheckOptions = {
+      const options: SanityCheckOptions = {
         ...new SanityCheckOptionsStub(),
         [testOptions.enablingOptionProperty]: false,
       };
diff --git a/tests/unit/presentation/bootstrapping/DependencyProvider.spec.ts b/tests/unit/presentation/bootstrapping/DependencyProvider.spec.ts
index a2abeaae..5212ce92 100644
--- a/tests/unit/presentation/bootstrapping/DependencyProvider.spec.ts
+++ b/tests/unit/presentation/bootstrapping/DependencyProvider.spec.ts
@@ -7,12 +7,14 @@ import { itIsSingletonFactory } from '@tests/unit/shared/TestCases/SingletonFact
 import type { IApplicationContext } from '@/application/Context/IApplicationContext';
 import { itIsTransientFactory } from '@tests/unit/shared/TestCases/TransientFactoryTests';
 import { executeInComponentSetupContext } from '@tests/shared/Vue/ExecuteInComponentSetupContext';
+import type { PropertyKeys } from '@/TypeHelpers';
+
+type InjectionKeyType = PropertyKeys<typeof InjectionKeys>;
+type DependencyInjectionTestFunction = (injectionKey: symbol) => void;
 
 describe('DependencyProvider', () => {
   describe('provideDependencies', () => {
-    const testCases: {
-      readonly [K in keyof typeof InjectionKeys]: (injectionKey: symbol) => void;
-    } = {
+    const testCases: Record<InjectionKeyType, DependencyInjectionTestFunction> = {
       useCollectionState: createTransientTests(),
       useApplication: createSingletonTests(),
       useRuntimeEnvironment: createSingletonTests(),
@@ -27,7 +29,8 @@ describe('DependencyProvider', () => {
       useAutoUnsubscribedEventListener: createTransientTests(),
     };
     Object.entries(testCases).forEach(([key, runTests]) => {
-      const registeredKey = InjectionKeys[key].key;
+      const injectionKey = key as InjectionKeyType;
+      const registeredKey = InjectionKeys[injectionKey].key;
       describe(`Key: "${registeredKey.toString()}"`, () => {
         runTests(registeredKey);
       });
@@ -35,7 +38,7 @@ describe('DependencyProvider', () => {
   });
 });
 
-function createTransientTests() {
+function createTransientTests(): DependencyInjectionTestFunction {
   return (injectionKey: symbol) => {
     it('should register a function when transient dependency is resolved', () => {
       // arrange
@@ -73,7 +76,7 @@ function createTransientTests() {
   };
 }
 
-function createSingletonTests() {
+function createSingletonTests(): DependencyInjectionTestFunction {
   return (injectionKey: symbol) => {
     it('should register an object when singleton dependency is resolved', () => {
       // arrange
diff --git a/tests/unit/presentation/bootstrapping/Modules/RuntimeSanityValidator.spec.ts b/tests/unit/presentation/bootstrapping/Modules/RuntimeSanityBootstrapper.spec.ts
similarity index 60%
rename from tests/unit/presentation/bootstrapping/Modules/RuntimeSanityValidator.spec.ts
rename to tests/unit/presentation/bootstrapping/Modules/RuntimeSanityBootstrapper.spec.ts
index 13fee54f..2690ef17 100644
--- a/tests/unit/presentation/bootstrapping/Modules/RuntimeSanityValidator.spec.ts
+++ b/tests/unit/presentation/bootstrapping/Modules/RuntimeSanityBootstrapper.spec.ts
@@ -1,20 +1,21 @@
 import { describe, it, expect } from 'vitest';
-import type { ISanityCheckOptions } from '@/infrastructure/RuntimeSanity/Common/ISanityCheckOptions';
-import { RuntimeSanityValidator } from '@/presentation/bootstrapping/Modules/RuntimeSanityValidator';
+import type { SanityCheckOptions } from '@/infrastructure/RuntimeSanity/Common/SanityCheckOptions';
+import { RuntimeSanityBootstrapper } from '@/presentation/bootstrapping/Modules/RuntimeSanityBootstrapper';
 import { expectDoesNotThrowAsync, expectThrowsAsync } from '@tests/shared/Assertions/ExpectThrowsAsync';
+import type { RuntimeSanityValidator } from '@/infrastructure/RuntimeSanity/SanityChecks';
 
-describe('RuntimeSanityValidator', () => {
+describe('RuntimeSanityBootstrapper', () => {
   it('calls validator with correct options upon bootstrap', async () => {
     // arrange
-    const expectedOptions: ISanityCheckOptions = {
+    const expectedOptions: SanityCheckOptions = {
       validateEnvironmentVariables: true,
       validateWindowVariables: true,
     };
-    let actualOptions: ISanityCheckOptions | undefined;
-    const validatorMock = (options) => {
+    let actualOptions: SanityCheckOptions | undefined;
+    const validatorMock: RuntimeSanityValidator = (options) => {
       actualOptions = options;
     };
-    const sut = new RuntimeSanityValidator(validatorMock);
+    const sut = new RuntimeSanityBootstrapper(validatorMock);
     // act
     await sut.bootstrap();
     // assert
@@ -26,7 +27,7 @@ describe('RuntimeSanityValidator', () => {
     const validatorMock = () => {
       throw new Error(expectedMessage);
     };
-    const sut = new RuntimeSanityValidator(validatorMock);
+    const sut = new RuntimeSanityBootstrapper(validatorMock);
     // act
     const act = async () => { await sut.bootstrap(); };
     // assert
@@ -35,7 +36,7 @@ describe('RuntimeSanityValidator', () => {
   it('runs successfully if validator passes', async () => {
     // arrange
     const validatorMock = () => { /* NOOP */ };
-    const sut = new RuntimeSanityValidator(validatorMock);
+    const sut = new RuntimeSanityBootstrapper(validatorMock);
     // act
     const act = async () => { await sut.bootstrap(); };
     // assert
diff --git a/tests/unit/presentation/components/Code/CodeButtons/Save/RunInstructions/Steps/PlatformInstructionSteps.spec.ts b/tests/unit/presentation/components/Code/CodeButtons/Save/RunInstructions/Steps/PlatformInstructionSteps.spec.ts
index d436efb6..aae1688b 100644
--- a/tests/unit/presentation/components/Code/CodeButtons/Save/RunInstructions/Steps/PlatformInstructionSteps.spec.ts
+++ b/tests/unit/presentation/components/Code/CodeButtons/Save/RunInstructions/Steps/PlatformInstructionSteps.spec.ts
@@ -17,7 +17,8 @@ describe('PlatformInstructionSteps', () => {
     [OperatingSystem.macOS]: MacOsInstructions,
     [OperatingSystem.Linux]: LinuxInstructions,
   };
-  AllSupportedOperatingSystems.forEach((operatingSystem) => {
+  AllSupportedOperatingSystems.forEach((operatingSystemKey) => {
+    const operatingSystem = operatingSystemKey as SupportedOperatingSystem;
     it(`renders the correct component for ${OperatingSystem[operatingSystem]}`, () => {
       // arrange
       const expectedComponent = testScenarios[operatingSystem];
@@ -47,7 +48,9 @@ describe('PlatformInstructionSteps', () => {
 
       // assert
       const componentWrapper = wrapper.findComponent(wrappedComponent);
-      expect(componentWrapper.props('filename')).to.equal(expectedFilename);
+      const propertyValues = componentWrapper.props();
+      const propertyValue = 'filename' in propertyValues ? propertyValues.filename : undefined;
+      expect(propertyValue).to.equal(expectedFilename);
     });
   });
 });
diff --git a/tests/unit/presentation/components/Scripts/View/Tree/NodeContent/Markdown/CompositeMarkdownRenderer.spec.ts b/tests/unit/presentation/components/Scripts/View/Tree/NodeContent/Markdown/CompositeMarkdownRenderer.spec.ts
index 16227d58..57a33503 100644
--- a/tests/unit/presentation/components/Scripts/View/Tree/NodeContent/Markdown/CompositeMarkdownRenderer.spec.ts
+++ b/tests/unit/presentation/components/Scripts/View/Tree/NodeContent/Markdown/CompositeMarkdownRenderer.spec.ts
@@ -8,7 +8,7 @@ describe('CompositeMarkdownRenderer', () => {
     it('throws error without renderers', () => {
       // arrange
       const expectedError = 'missing renderers';
-      const renderers = [];
+      const renderers = new Array<MarkdownRenderer>();
       const context = new MarkdownRendererTestBuilder()
         .withMarkdownRenderers(renderers);
       // act
diff --git a/tests/unit/presentation/components/Scripts/View/Tree/TreeView/Node/Hierarchy/TreeNodeHierarchy.spec.ts b/tests/unit/presentation/components/Scripts/View/Tree/TreeView/Node/Hierarchy/TreeNodeHierarchy.spec.ts
index 5d6f5726..f01b7704 100644
--- a/tests/unit/presentation/components/Scripts/View/Tree/TreeView/Node/Hierarchy/TreeNodeHierarchy.spec.ts
+++ b/tests/unit/presentation/components/Scripts/View/Tree/TreeView/Node/Hierarchy/TreeNodeHierarchy.spec.ts
@@ -33,7 +33,7 @@ describe('TreeNodeHierarchy', () => {
     it('returns `true` without children', () => {
       // arrange
       const hierarchy = new TreeNodeHierarchy();
-      const children = [];
+      const children = new Array<TreeNode>();
       // act
       hierarchy.setChildren(children);
       // assert
@@ -55,7 +55,7 @@ describe('TreeNodeHierarchy', () => {
     it('returns `false` without children', () => {
       // arrange
       const hierarchy = new TreeNodeHierarchy();
-      const children = [];
+      const children = new Array<TreeNode>();
       // act
       hierarchy.setChildren(children);
       // assert
diff --git a/tests/unit/presentation/components/Scripts/View/Tree/TreeView/Rendering/UseGradualNodeRendering.spec.ts b/tests/unit/presentation/components/Scripts/View/Tree/TreeView/Rendering/UseGradualNodeRendering.spec.ts
index 3d3cc2e3..4a476332 100644
--- a/tests/unit/presentation/components/Scripts/View/Tree/TreeView/Rendering/UseGradualNodeRendering.spec.ts
+++ b/tests/unit/presentation/components/Scripts/View/Tree/TreeView/Rendering/UseGradualNodeRendering.spec.ts
@@ -237,7 +237,7 @@ describe('useGradualNodeRendering', () => {
   });
   it('skips scheduling when no nodes to render', () => {
     // arrange
-    const nodes = [];
+    const nodes = new Array<TreeNode>();
     const nodesStub = new UseCurrentTreeNodesStub()
       .withQueryableNodes(new QueryableNodesStub().withFlattenedNodes(nodes));
     const delaySchedulerStub = new DelaySchedulerStub();
diff --git a/tests/unit/presentation/components/Scripts/View/Tree/TreeView/TreeRoot/NodeCollection/TreeInputParser.spec.ts b/tests/unit/presentation/components/Scripts/View/Tree/TreeView/TreeRoot/NodeCollection/TreeInputParser.spec.ts
index 0206dc4e..e23f8264 100644
--- a/tests/unit/presentation/components/Scripts/View/Tree/TreeView/TreeRoot/NodeCollection/TreeInputParser.spec.ts
+++ b/tests/unit/presentation/components/Scripts/View/Tree/TreeView/TreeRoot/NodeCollection/TreeInputParser.spec.ts
@@ -17,7 +17,7 @@ describe('parseTreeInput', () => {
 
   it('returns an empty array if given an empty array', () => {
     // arrange
-    const input = [];
+    const input = new Array<TreeInputNodeData>();
     // act
     const nodes = parseTreeInput(input);
     // assert
diff --git a/tests/unit/presentation/components/Scripts/View/Tree/TreeView/TreeRoot/TreeRootManager.ts b/tests/unit/presentation/components/Scripts/View/Tree/TreeView/TreeRoot/TreeRootManager.ts
index e826ee04..b3f35bcf 100644
--- a/tests/unit/presentation/components/Scripts/View/Tree/TreeView/TreeRoot/TreeRootManager.ts
+++ b/tests/unit/presentation/components/Scripts/View/Tree/TreeView/TreeRoot/TreeRootManager.ts
@@ -1,7 +1,7 @@
 import { SingleNodeCollectionFocusManager } from '@/presentation/components/Scripts/View/Tree/TreeView/TreeRoot/Focus/SingleNodeCollectionFocusManager';
 import type { TreeNodeCollection } from '@/presentation/components/Scripts/View/Tree/TreeView/TreeRoot/NodeCollection/TreeNodeCollection';
 import { TreeNodeInitializerAndUpdater } from '@/presentation/components/Scripts/View/Tree/TreeView/TreeRoot/NodeCollection/TreeNodeInitializerAndUpdater';
-import { TreeRootManager } from '@/presentation/components/Scripts/View/Tree/TreeView/TreeRoot/TreeRootManager';
+import { TreeRootManager, type FocusManagerFactory } from '@/presentation/components/Scripts/View/Tree/TreeView/TreeRoot/TreeRootManager';
 import { SingleNodeFocusManagerStub } from '@tests/unit/shared/Stubs/SingleNodeFocusManagerStub';
 import { TreeNodeCollectionStub } from '@tests/unit/shared/Stubs/TreeNodeCollectionStub';
 
@@ -19,9 +19,12 @@ describe('TreeRootManager', () => {
     it('set by constructor as expected', () => {
       // arrange
       const expectedCollection = new TreeNodeCollectionStub();
-      const sut = new TreeRootManager();
+      const context = new TestContext()
+        .withNodeCollection(expectedCollection);
       // act
-      const actualCollection = sut.collection;
+      const actualCollection = context
+        .build()
+        .collection;
       // assert
       expect(actualCollection).to.equal(expectedCollection);
     });
@@ -39,15 +42,41 @@ describe('TreeRootManager', () => {
     it('creates with same collection it uses', () => {
       // arrange
       let usedCollection: TreeNodeCollection | undefined;
-      const factoryMock = (collection) => {
+      const factoryMock: FocusManagerFactory = (collection) => {
         usedCollection = collection;
         return new SingleNodeFocusManagerStub();
       };
-      const sut = new TreeRootManager(new TreeNodeCollectionStub(), factoryMock);
+      const context = new TestContext()
+        .withFocusManagerFactory(factoryMock);
       // act
-      const expected = sut.collection;
+      const expected = context
+        .build()
+        .collection;
       // assert
       expect(usedCollection).to.equal(expected);
     });
   });
 });
+
+class TestContext {
+  private nodeCollection: TreeNodeCollection = new TreeNodeCollectionStub();
+
+  private focusManagerFactory: FocusManagerFactory = () => new SingleNodeFocusManagerStub();
+
+  public withFocusManagerFactory(focusManagerFactory: FocusManagerFactory): this {
+    this.focusManagerFactory = focusManagerFactory;
+    return this;
+  }
+
+  public withNodeCollection(nodeCollection: TreeNodeCollection): this {
+    this.nodeCollection = nodeCollection;
+    return this;
+  }
+
+  public build(): TreeRootManager {
+    return new TreeRootManager(
+      this.nodeCollection,
+      this.focusManagerFactory,
+    );
+  }
+}
diff --git a/tests/unit/presentation/components/Scripts/View/Tree/TreeViewAdapter/UseSelectedScriptNodeIds.spec.ts b/tests/unit/presentation/components/Scripts/View/Tree/TreeViewAdapter/UseSelectedScriptNodeIds.spec.ts
index 8db64c9f..572bd438 100644
--- a/tests/unit/presentation/components/Scripts/View/Tree/TreeViewAdapter/UseSelectedScriptNodeIds.spec.ts
+++ b/tests/unit/presentation/components/Scripts/View/Tree/TreeViewAdapter/UseSelectedScriptNodeIds.spec.ts
@@ -7,6 +7,7 @@ import { UseUserSelectionStateStub } from '@tests/unit/shared/Stubs/UseUserSelec
 import { ScriptStub } from '@tests/unit/shared/Stubs/ScriptStub';
 import type { TreeNodeId } from '@/presentation/components/Scripts/View/Tree/TreeView/Node/TreeNode';
 import type { Executable } from '@/domain/Executables/Executable';
+import type { SelectedScript } from '@/application/Context/State/Selection/Script/SelectedScript';
 
 describe('useSelectedScriptNodeIds', () => {
   it('returns an empty array when no scripts are selected', () => {
@@ -44,7 +45,7 @@ describe('useSelectedScriptNodeIds', () => {
     });
     it('when the selection state changes', () => {
       // arrange
-      const initialScripts = [];
+      const initialScripts = new Array<SelectedScript>();
       const changedScripts = [
         new SelectedScriptStub(new ScriptStub('id-1')),
         new SelectedScriptStub(new ScriptStub('id-2')),
diff --git a/tests/unit/presentation/components/Shared/ExpandCollapse/UseExpandCollapseAnimation.spec.ts b/tests/unit/presentation/components/Shared/ExpandCollapse/UseExpandCollapseAnimation.spec.ts
index ecf37849..c9e22a53 100644
--- a/tests/unit/presentation/components/Shared/ExpandCollapse/UseExpandCollapseAnimation.spec.ts
+++ b/tests/unit/presentation/components/Shared/ExpandCollapse/UseExpandCollapseAnimation.spec.ts
@@ -67,7 +67,7 @@ function runSharedTestsForAnimation(
     };
     const element = document.createElement('div');
     Object.entries(expectedStyleValues).forEach(([key, value]) => {
-      element.style[key] = value;
+      element.style[key as keyof MutatedStyleProperties] = value;
     });
     const timer = new TimerStub();
     const hookResult = useExpandCollapseAnimation(timer);
@@ -78,7 +78,8 @@ function runSharedTestsForAnimation(
     await promise;
     // assert
     Object.entries(expectedStyleValues).forEach(([key, expectedStyleValue]) => {
-      const actualStyleValue = element.style[key];
+      const styleProperty = key as keyof MutatedStyleProperties;
+      const actualStyleValue = element.style[styleProperty];
       expect(actualStyleValue).to.equal(expectedStyleValue, formatAssertionMessage([
         `Style key: ${key}`,
         `Expected style value: ${expectedStyleValue}`,
@@ -86,7 +87,7 @@ function runSharedTestsForAnimation(
         `Initial style value: ${expectedStyleValues}`,
         'All styles:',
         ...Object.entries(expectedStyleValues)
-          .map(([k, value]) => indentText(`- ${k} > actual: "${element.style[k]}" | expected: "${value}"`)),
+          .map(([k, value]) => indentText(`- ${k} > actual: "${actualStyleValue}" | expected: "${value}"`)),
       ]));
     });
   });
diff --git a/tests/unit/presentation/components/Shared/Hooks/Clipboard/UseClipboard.spec.ts b/tests/unit/presentation/components/Shared/Hooks/Clipboard/UseClipboard.spec.ts
index 134004ec..0be83e73 100644
--- a/tests/unit/presentation/components/Shared/Hooks/Clipboard/UseClipboard.spec.ts
+++ b/tests/unit/presentation/components/Shared/Hooks/Clipboard/UseClipboard.spec.ts
@@ -30,18 +30,19 @@ describe('useClipboard', () => {
     } = {
       copyText: ['text-arg'],
     };
-    Object.entries(testScenarios).forEach(([functionName, testFunctionArgs]) => {
-      describe(functionName, () => {
+    Object.entries(testScenarios).forEach(([functionNameValue, testFunctionArgs]) => {
+      const functionName = functionNameValue as ClipboardFunction;
+      describe(functionNameValue, () => {
         it('binds the method to the instance', () => {
           // arrange
           const expectedArgs = testFunctionArgs;
           const clipboardStub = new ClipboardStub();
           // act
           const clipboard = useClipboard(clipboardStub);
-          const { [functionName as ClipboardFunction]: testFunction } = clipboard;
+          const { [functionName]: testFunction } = clipboard;
           // assert
           testFunction(...expectedArgs);
-          const call = clipboardStub.callHistory.find((c) => c.methodName === functionName);
+          const call = clipboardStub.callHistory.find((c) => c.methodName === functionNameValue);
           expectExists(call);
           expect(call.args).to.deep.equal(expectedArgs);
         });
@@ -50,14 +51,15 @@ describe('useClipboard', () => {
           const clipboardStub = new ClipboardStub();
           const expectedThisContext = clipboardStub;
           let actualThisContext: typeof expectedThisContext | undefined;
-          // eslint-disable-next-line func-names
-          clipboardStub[functionName] = function () {
+          // eslint-disable-next-line func-names, @typescript-eslint/no-unused-vars
+          clipboardStub[functionName] = function (_text) {
             // eslint-disable-next-line @typescript-eslint/no-this-alias
             actualThisContext = this;
+            return Promise.resolve();
           };
           // act
           const clipboard = useClipboard(clipboardStub);
-          const { [functionName as ClipboardFunction]: testFunction } = clipboard;
+          const { [functionNameValue as ClipboardFunction]: testFunction } = clipboard;
           // assert
           testFunction(...testFunctionArgs);
           expect(expectedThisContext).to.equal(actualThisContext);
diff --git a/tests/unit/presentation/components/Shared/Hooks/UseUserSelectionState.spec.ts b/tests/unit/presentation/components/Shared/Hooks/UseUserSelectionState.spec.ts
index eb55f1a5..06da09ed 100644
--- a/tests/unit/presentation/components/Shared/Hooks/UseUserSelectionState.spec.ts
+++ b/tests/unit/presentation/components/Shared/Hooks/UseUserSelectionState.spec.ts
@@ -9,6 +9,7 @@ import { ScriptStub } from '@tests/unit/shared/Stubs/ScriptStub';
 import { CategoryCollectionStateStub } from '@tests/unit/shared/Stubs/CategoryCollectionStateStub';
 import { SelectedScriptStub } from '@tests/unit/shared/Stubs/SelectedScriptStub';
 import { ScriptSelectionStub } from '@tests/unit/shared/Stubs/ScriptSelectionStub';
+import type { SelectedScript } from '@/application/Context/State/Selection/Script/SelectedScript';
 
 describe('useUserSelectionState', () => {
   describe('currentSelection', () => {
@@ -170,8 +171,8 @@ describe('useUserSelectionState', () => {
       describe('triggers change', () => {
         it('with new selected scripts array reference', async () => {
           // arrange
-          const oldSelectedScriptsArrayReference = [];
-          const newSelectedScriptsArrayReference = [];
+          const oldSelectedScriptsArrayReference = new Array<SelectedScript>();
+          const newSelectedScriptsArrayReference = new Array<SelectedScript>();
           const scriptSelectionStub = new ScriptSelectionStub()
             .withSelectedScripts(oldSelectedScriptsArrayReference);
           const collectionStateStub = new UseCollectionStateStub()
@@ -191,7 +192,7 @@ describe('useUserSelectionState', () => {
         });
         it('with same selected scripts array reference', async () => {
           // arrange
-          const sharedSelectedScriptsReference = [];
+          const sharedSelectedScriptsReference = new Array<SelectedScript>();
           const scriptSelectionStub = new ScriptSelectionStub()
             .withSelectedScripts(sharedSelectedScriptsReference);
           const collectionStateStub = new UseCollectionStateStub()
diff --git a/tests/unit/presentation/electron/main/IpcRegistration.spec.ts b/tests/unit/presentation/electron/main/IpcRegistration.spec.ts
index 7bf7a435..038b26dc 100644
--- a/tests/unit/presentation/electron/main/IpcRegistration.spec.ts
+++ b/tests/unit/presentation/electron/main/IpcRegistration.spec.ts
@@ -65,7 +65,7 @@ describe('IpcRegistration', () => {
           // act
           context.run();
           // assert
-          const channel = IpcChannelDefinitions[key];
+          const channel = IpcChannelDefinitions[key as ChannelDefinitionKey] as IpcChannel<unknown>;
           const actualInstance = getRegisteredInstance(channel);
           expect(actualInstance).to.equal(expectedInstance);
         });
diff --git a/tests/unit/presentation/electron/preload/ContextBridging/RendererApiProvider.spec.ts b/tests/unit/presentation/electron/preload/ContextBridging/RendererApiProvider.spec.ts
index 65209f83..84821861 100644
--- a/tests/unit/presentation/electron/preload/ContextBridging/RendererApiProvider.spec.ts
+++ b/tests/unit/presentation/electron/preload/ContextBridging/RendererApiProvider.spec.ts
@@ -50,7 +50,7 @@ describe('RendererApiProvider', () => {
         // act
         const variables = testContext.provideWindowVariables();
         // assert
-        const actualValue = variables[property];
+        const actualValue = variables[property as PropertyKeys<Required<WindowVariables>>];
         expect(actualValue).to.equal(expectedValue);
       });
     });
diff --git a/tests/unit/presentation/electron/shared/IpcChannelDefinitions.spec.ts b/tests/unit/presentation/electron/shared/IpcChannelDefinitions.spec.ts
index 695987f0..ee23c655 100644
--- a/tests/unit/presentation/electron/shared/IpcChannelDefinitions.spec.ts
+++ b/tests/unit/presentation/electron/shared/IpcChannelDefinitions.spec.ts
@@ -1,5 +1,4 @@
 import { describe, it, expect } from 'vitest';
-import type { IpcChannel } from '@/presentation/electron/shared/IpcBridging/IpcChannel';
 import { type ChannelDefinitionKey, IpcChannelDefinitions } from '@/presentation/electron/shared/IpcBridging/IpcChannelDefinitions';
 
 describe('IpcChannelDefinitions', () => {
@@ -25,7 +24,7 @@ describe('IpcChannelDefinitions', () => {
       [definitionKey, { expectedNamespace, expectedAccessibleMembers }],
     ) => {
       describe(`channel: "${definitionKey}"`, () => {
-        const ipcChannelUnderTest = IpcChannelDefinitions[definitionKey] as IpcChannel<unknown>;
+        const ipcChannelUnderTest = IpcChannelDefinitions[definitionKey as ChannelDefinitionKey];
         it('has expected namespace', () => {
           // act
           const actualNamespace = ipcChannelUnderTest.namespace;
diff --git a/tests/unit/shared/Stubs/ExpressionStub.ts b/tests/unit/shared/Stubs/ExpressionStub.ts
index b4f804fa..c20ac47d 100644
--- a/tests/unit/shared/Stubs/ExpressionStub.ts
+++ b/tests/unit/shared/Stubs/ExpressionStub.ts
@@ -38,7 +38,7 @@ export class ExpressionStub implements IExpression {
     this.callHistory.push(context);
     if (this.result === undefined /* not empty string */) {
       const { args } = context;
-      return `[expression-stub] args: ${args ? Object.keys(args).map((key) => `${key}: ${args[key]}`).join('", "') : 'none'}`;
+      return `[expression-stub] args: ${args ? Object.entries(args).map((key, value) => `${key}: ${value}`).join('", "') : 'none'}`;
     }
     return this.result;
   }
diff --git a/tests/unit/shared/Stubs/SanityCheckOptionsStub.ts b/tests/unit/shared/Stubs/SanityCheckOptionsStub.ts
index 228240d1..e296a165 100644
--- a/tests/unit/shared/Stubs/SanityCheckOptionsStub.ts
+++ b/tests/unit/shared/Stubs/SanityCheckOptionsStub.ts
@@ -1,6 +1,6 @@
-import type { ISanityCheckOptions } from '@/infrastructure/RuntimeSanity/Common/ISanityCheckOptions';
+import type { SanityCheckOptions } from '@/infrastructure/RuntimeSanity/Common/SanityCheckOptions';
 
-export class SanityCheckOptionsStub implements ISanityCheckOptions {
+export class SanityCheckOptionsStub implements SanityCheckOptions {
   public validateWindowVariables = false;
 
   public validateEnvironmentVariables = false;
diff --git a/tests/unit/shared/Stubs/SanityValidatorStub.ts b/tests/unit/shared/Stubs/SanityValidatorStub.ts
index 45ed842b..a351db73 100644
--- a/tests/unit/shared/Stubs/SanityValidatorStub.ts
+++ b/tests/unit/shared/Stubs/SanityValidatorStub.ts
@@ -1,8 +1,8 @@
-import type { ISanityCheckOptions } from '@/infrastructure/RuntimeSanity/Common/ISanityCheckOptions';
-import type { ISanityValidator } from '@/infrastructure/RuntimeSanity/Common/ISanityValidator';
+import type { SanityCheckOptions } from '@/infrastructure/RuntimeSanity/Common/SanityCheckOptions';
+import type { SanityValidator } from '@/infrastructure/RuntimeSanity/Common/SanityValidator';
 
-export class SanityValidatorStub implements ISanityValidator {
-  public shouldValidateArgs = new Array<ISanityCheckOptions>();
+export class SanityValidatorStub implements SanityValidator {
+  public shouldValidateArgs = new Array<SanityCheckOptions>();
 
   public name = 'sanity-validator-stub';
 
@@ -10,7 +10,7 @@ export class SanityValidatorStub implements ISanityValidator {
 
   private shouldValidateResult = true;
 
-  public shouldValidate(options: ISanityCheckOptions): boolean {
+  public shouldValidate(options: SanityCheckOptions): boolean {
     this.shouldValidateArgs.push(options);
     return this.shouldValidateResult;
   }
diff --git a/tests/unit/shared/Stubs/VueDependencyInjectionApiStub.ts b/tests/unit/shared/Stubs/VueDependencyInjectionApiStub.ts
index 9f71ead6..502c5a9c 100644
--- a/tests/unit/shared/Stubs/VueDependencyInjectionApiStub.ts
+++ b/tests/unit/shared/Stubs/VueDependencyInjectionApiStub.ts
@@ -11,7 +11,7 @@ export class VueDependencyInjectionApiStub implements VueDependencyInjectionApi
   public inject<T>(key: InjectionKey<T>): T {
     const providedValue = this.injections.get(key);
     if (providedValue === undefined) {
-      throw new Error(`[VueDependencyInjectionApiStub] No value provided for key: ${String(key)}`);
+      throw new Error(`[${VueDependencyInjectionApiStub.name}] No value provided for key: ${String(key)}`);
     }
     return providedValue as T;
   }
diff --git a/tsconfig.json b/tsconfig.json
index cceccf8b..456ee38b 100644
--- a/tsconfig.json
+++ b/tsconfig.json
@@ -1,6 +1,6 @@
 {
   "compilerOptions": {
-    "target": "ES2017",
+    "target": "ES2018",
     "lib": ["ESNext", "DOM", "DOM.Iterable"],
     "module": "ESNext",
     "importHelpers": true,
@@ -8,6 +8,7 @@
     "jsx": "preserve",
     "moduleResolution": "Bundler",
     "strictNullChecks": true,
+    "noImplicitAny": true,
     "experimentalDecorators": true,
     "esModuleInterop": true,
     "resolveJsonModule": true,
diff --git a/vite-config-helper.ts b/vite-config-helper.ts
index ed4f3a76..151e62d1 100644
--- a/vite-config-helper.ts
+++ b/vite-config-helper.ts
@@ -44,14 +44,14 @@ export function getClientEnvironmentVariables(): ViteGlobalVariableReplacementDe
 
 function getPathAliasesFromTsConfig(): ViteAliasDefinitions {
   const { paths } = tsconfigJson.compilerOptions;
-  return Object.keys(paths).reduce((aliases, pathName) => {
+  return Object.keys(paths).reduce((aliases, pathName: keyof typeof paths) => {
     const pathFolder = paths[pathName][0];
     const aliasFolder = pathFolder.substring(0, pathFolder.length - 1); // trim * from end
     const aliasName = pathName.substring(0, pathName.length - 2); // trim /* from end
     const aliasPath = resolve(getSelfDirectoryAbsolutePath(), aliasFolder);
     aliases[aliasName] = aliasPath;
     return aliases;
-  }, {});
+  }, {} as ViteAliasDefinitions);
 }
 
 function getElectronProcessSpecificModuleAliases(): ViteAliasDefinitions {
@@ -64,5 +64,5 @@ function getElectronProcessSpecificModuleAliases(): ViteAliasDefinitions {
   return electronProcessScopedModuleAliases.reduce((aliases, alias) => {
     aliases[alias] = 'electron';
     return aliases;
-  }, {});
+  }, {} as ViteAliasDefinitions);
 }