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kbn/config-schema: Consider maybe properties as optional keys in ObjectType #63838

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merged 4 commits into from
Apr 21, 2020
Merged

kbn/config-schema: Consider maybe properties as optional keys in ObjectType #63838

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3c28c21
consider optional properties as optional keys in ObjectType
pgayvallet Apr 17, 2020
58e2756
fix type on security config
pgayvallet Apr 17, 2020
996cd13
fix ObjectTypeOptions
pgayvallet Apr 17, 2020
c229590
Merge remote-tracking branch 'upstream/master' into kbn-63725-maybe-o…
pgayvallet Apr 20, 2020
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24 changes: 24 additions & 0 deletions packages/kbn-config-schema/src/types/object_type.test.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -18,6 +18,7 @@
*/

import { schema } from '..';
import { TypeOf } from './object_type';

test('returns value by default', () => {
const type = schema.object({
Expand Down Expand Up @@ -350,3 +351,26 @@ test('unknowns = `ignore` affects only own keys', () => {
})
).toThrowErrorMatchingInlineSnapshot(`"[foo.baz]: definition for this key is missing"`);
});

test('handles optional properties', () => {
const type = schema.object({
required: schema.string(),
optional: schema.maybe(schema.string()),
});

type SchemaType = TypeOf<typeof type>;

let foo: SchemaType = {
required: 'foo',
};
foo = {
required: 'hello',
optional: undefined,
};
foo = {
required: 'hello',
optional: 'bar',
};
Comment on lines +363 to +373
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Until we got proper way to test TS typings, this is the best test I could add. Not even sure it's very relevant, as I can only assert valid assignments and not invalid ones.

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I added this test to #53762 we can improve it later.


expect(foo).toBeDefined();
});
22 changes: 20 additions & 2 deletions packages/kbn-config-schema/src/types/object_type.ts
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Expand Up @@ -26,9 +26,26 @@ export type Props = Record<string, Type<any>>;

export type TypeOf<RT extends Type<any>> = RT['type'];

type OptionalProperties<Base extends Props> = Pick<
Base,
{
[Key in keyof Base]: undefined extends TypeOf<Base[Key]> ? Key : never;
}[keyof Base]
>;

type RequiredProperties<Base extends Props> = Pick<
Base,
{
[Key in keyof Base]: undefined extends TypeOf<Base[Key]> ? never : Key;
}[keyof Base]
>;

// Because of https://github.com/Microsoft/TypeScript/issues/14041
// this might not have perfect _rendering_ output, but it will be typed.
export type ObjectResultType<P extends Props> = Readonly<{ [K in keyof P]: TypeOf<P[K]> }>;
export type ObjectResultType<P extends Props> = Readonly<
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maxresdefault

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Yea, TS magic... TBH I really thought there would be an easier way to type that, but AFAIK there is not, as the ? modifier for an object key(s) cannot be directly inferred / depends on the associated value/property...

{ [K in keyof OptionalProperties<P>]?: TypeOf<P[K]> } &
{ [K in keyof RequiredProperties<P>]: TypeOf<P[K]> }
>;

interface UnknownOptions {
/**
Expand All @@ -41,7 +58,8 @@ interface UnknownOptions {
}

export type ObjectTypeOptions<P extends Props = any> = TypeOptions<
{ [K in keyof P]: TypeOf<P[K]> }
{ [K in keyof OptionalProperties<P>]?: TypeOf<P[K]> } &
{ [K in keyof RequiredProperties<P>]: TypeOf<P[K]> }
> &
UnknownOptions;

Expand Down
6 changes: 3 additions & 3 deletions src/core/server/http/router/validator/validator.ts
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Expand Up @@ -170,23 +170,23 @@ export class RouteValidator<P = {}, Q = {}, B = {}> {
* @internal
*/
public getParams(data: unknown, namespace?: string): Readonly<P> {
return this.validate(this.config.params, this.options.unsafe?.params, data, namespace);
return this.validate(this.config.params, this.options.unsafe?.params, data, namespace) as P;
Comment on lines -173 to +180
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So, introducing this change in the ObjectResultType caused errors due to RouteValidationSpec and RouteValidationResultType types being different for ObjectType schemas, as the keys mutates. However after spending a lot of time on that (and with @afharo 's help), it appear that this can't really be fixed without a reverse type for ObjectResultType (something like ObjectParamsFromResultType), to properly fix RouteValidationResultType, which is not technically doable.

I think this is still fine because:

  • type inference is still working, and the maybe property keys are correctly considered optionals in the resulting request properties when using in route handlers. It's really only the internal/private methods typing that needs this fix (the return type of validate). it 'works as expected' for a public API point of view.
  • we got good test coverage for this code.

But if someone wants to take another look, please do 😄

}

/**
* Get validated query params
* @internal
*/
public getQuery(data: unknown, namespace?: string): Readonly<Q> {
return this.validate(this.config.query, this.options.unsafe?.query, data, namespace);
return this.validate(this.config.query, this.options.unsafe?.query, data, namespace) as Q;
}

/**
* Get validated body
* @internal
*/
public getBody(data: unknown, namespace?: string): Readonly<B> {
return this.validate(this.config.body, this.options.unsafe?.body, data, namespace);
return this.validate(this.config.body, this.options.unsafe?.body, data, namespace) as B;
}

/**
Expand Down