diff --git a/package.json b/package.json
index 5319c201..96008e9f 100644
--- a/package.json
+++ b/package.json
@@ -49,10 +49,12 @@
 	},
 	"devDependencies": {
 		"@types/node": "^11.10.4",
+		"@types/react": "^16.9.2",
 		"@types/update-notifier": "^2.2.0",
 		"ava": "^1.4.1",
 		"cpy-cli": "^2.0.0",
 		"del-cli": "^1.1.0",
+		"react": "^16.9.0",
 		"tslint": "^5.11.0",
 		"tslint-xo": "^0.9.0"
 	}
diff --git a/source/lib/index.ts b/source/lib/index.ts
index 9bd6bc26..a58b04e5 100644
--- a/source/lib/index.ts
+++ b/source/lib/index.ts
@@ -25,19 +25,19 @@ const findTypingsFile = async (pkg: any, options: Options) => {
 
 const findTestFiles = async (typingsFile: string, options: Options & {config: Config}) => {
 	const testFile = typingsFile.replace(/\.d\.ts$/, '.test-d.ts');
+	const tsxTestFile = typingsFile.replace(/\.d\.ts$/, '.test-d.tsx');
 	const testDir = options.config.directory;
 
-	const testFileExists = await pathExists(path.join(options.cwd, testFile));
+	let testFiles = await globby([testFile, tsxTestFile], {cwd: options.cwd});
+
 	const testDirExists = await pathExists(path.join(options.cwd, testDir));
 
-	if (!testFileExists && !testDirExists) {
-		throw new Error(`The test file \`${testFile}\` does not exist. Create one and try again.`);
+	if (testFiles.length === 0 && !testDirExists) {
+		throw new Error(`The test file \`${testFile}\` or \`${tsxTestFile}\` does not exist. Create one and try again.`);
 	}
 
-	let testFiles = [testFile];
-
-	if (!testFileExists) {
-		testFiles = await globby(`${testDir}/**/*.ts`, {cwd: options.cwd});
+	if (testFiles.length === 0) {
+		testFiles = await globby([`${testDir}/**/*.ts`, `${testDir}/**/*.tsx`], {cwd: options.cwd});
 	}
 
 	return testFiles;
diff --git a/source/test/fixtures/lib-config/failure-missing-lib/index.d.ts b/source/test/fixtures/lib-config/failure-missing-lib/index.d.ts
index b34a6db6..440e7c96 100644
--- a/source/test/fixtures/lib-config/failure-missing-lib/index.d.ts
+++ b/source/test/fixtures/lib-config/failure-missing-lib/index.d.ts
@@ -1,3 +1,3 @@
-declare const document: Document;
+declare const window: Window;
 
-export default document;
+export default window;
diff --git a/source/test/fixtures/lib-config/failure-missing-lib/index.js b/source/test/fixtures/lib-config/failure-missing-lib/index.js
index 674f77d5..92505d8a 100644
--- a/source/test/fixtures/lib-config/failure-missing-lib/index.js
+++ b/source/test/fixtures/lib-config/failure-missing-lib/index.js
@@ -1 +1 @@
-module.exports.default = window.document;
+module.exports.default = window;
diff --git a/source/test/fixtures/lib-config/failure-missing-lib/index.test-d.ts b/source/test/fixtures/lib-config/failure-missing-lib/index.test-d.ts
index d7585f79..ef7346a0 100644
--- a/source/test/fixtures/lib-config/failure-missing-lib/index.test-d.ts
+++ b/source/test/fixtures/lib-config/failure-missing-lib/index.test-d.ts
@@ -1,4 +1,4 @@
 import {expectType} from '../../../..';
-import document from '.';
+import window from '.';
 
-expectType<Document>(document);
+expectType<Window>(window);
diff --git a/source/test/fixtures/lib-config/lib-as-triple-slash-reference/index.d.ts b/source/test/fixtures/lib-config/lib-as-triple-slash-reference/index.d.ts
index b38f8937..3a53f3d2 100644
--- a/source/test/fixtures/lib-config/lib-as-triple-slash-reference/index.d.ts
+++ b/source/test/fixtures/lib-config/lib-as-triple-slash-reference/index.d.ts
@@ -1,5 +1,5 @@
 /// <reference lib="dom"/>
 
-declare const document: Document;
+declare const window: Window;
 
-export default document;
+export default window;
diff --git a/source/test/fixtures/lib-config/lib-as-triple-slash-reference/index.js b/source/test/fixtures/lib-config/lib-as-triple-slash-reference/index.js
index 674f77d5..92505d8a 100644
--- a/source/test/fixtures/lib-config/lib-as-triple-slash-reference/index.js
+++ b/source/test/fixtures/lib-config/lib-as-triple-slash-reference/index.js
@@ -1 +1 @@
-module.exports.default = window.document;
+module.exports.default = window;
diff --git a/source/test/fixtures/lib-config/lib-as-triple-slash-reference/index.test-d.ts b/source/test/fixtures/lib-config/lib-as-triple-slash-reference/index.test-d.ts
index d7585f79..ef7346a0 100644
--- a/source/test/fixtures/lib-config/lib-as-triple-slash-reference/index.test-d.ts
+++ b/source/test/fixtures/lib-config/lib-as-triple-slash-reference/index.test-d.ts
@@ -1,4 +1,4 @@
 import {expectType} from '../../../..';
-import document from '.';
+import window from '.';
 
-expectType<Document>(document);
+expectType<Window>(window);
diff --git a/source/test/fixtures/test-directory/tsx/index.d.ts b/source/test/fixtures/test-directory/tsx/index.d.ts
new file mode 100644
index 00000000..74067858
--- /dev/null
+++ b/source/test/fixtures/test-directory/tsx/index.d.ts
@@ -0,0 +1,7 @@
+import {Component} from 'react';
+
+interface UnicornProps {
+	rainbow: string;
+}
+
+export class Unicorn extends Component<UnicornProps> {}
diff --git a/source/test/fixtures/test-directory/tsx/index.js b/source/test/fixtures/test-directory/tsx/index.js
new file mode 100644
index 00000000..6db2eca6
--- /dev/null
+++ b/source/test/fixtures/test-directory/tsx/index.js
@@ -0,0 +1,12 @@
+'use strict';
+const React = require('react');
+
+export class Unicorn extends React.Component {
+	constructor(props) {
+		super(props);
+	}
+
+	render() {
+		return <h1>{this.props.rainbow}</h1>;
+	}
+}
diff --git a/source/test/fixtures/test-directory/tsx/package.json b/source/test/fixtures/test-directory/tsx/package.json
new file mode 100644
index 00000000..09392033
--- /dev/null
+++ b/source/test/fixtures/test-directory/tsx/package.json
@@ -0,0 +1,10 @@
+{
+	"name": "foo",
+	"files": [
+		"index.js",
+		"index.d.ts"
+	],
+	"dependencies": {
+		"react": "*"
+	}
+}
diff --git a/source/test/fixtures/test-directory/tsx/test-d/unicorn.tsx b/source/test/fixtures/test-directory/tsx/test-d/unicorn.tsx
new file mode 100644
index 00000000..24473abf
--- /dev/null
+++ b/source/test/fixtures/test-directory/tsx/test-d/unicorn.tsx
@@ -0,0 +1,7 @@
+import * as React from 'react';
+import {expectType, expectError} from '../../../../..';
+import {Unicorn} from '..';
+
+expectType<JSX.Element>(<Unicorn rainbow='🌈' />);
+
+expectError(<Unicorn foo='bar' />);
diff --git a/source/test/fixtures/tsx/index.d.ts b/source/test/fixtures/tsx/index.d.ts
new file mode 100644
index 00000000..74067858
--- /dev/null
+++ b/source/test/fixtures/tsx/index.d.ts
@@ -0,0 +1,7 @@
+import {Component} from 'react';
+
+interface UnicornProps {
+	rainbow: string;
+}
+
+export class Unicorn extends Component<UnicornProps> {}
diff --git a/source/test/fixtures/tsx/index.js b/source/test/fixtures/tsx/index.js
new file mode 100644
index 00000000..6db2eca6
--- /dev/null
+++ b/source/test/fixtures/tsx/index.js
@@ -0,0 +1,12 @@
+'use strict';
+const React = require('react');
+
+export class Unicorn extends React.Component {
+	constructor(props) {
+		super(props);
+	}
+
+	render() {
+		return <h1>{this.props.rainbow}</h1>;
+	}
+}
diff --git a/source/test/fixtures/tsx/index.test-d.tsx b/source/test/fixtures/tsx/index.test-d.tsx
new file mode 100644
index 00000000..afa2157e
--- /dev/null
+++ b/source/test/fixtures/tsx/index.test-d.tsx
@@ -0,0 +1,7 @@
+import * as React from 'react';
+import {expectType, expectError} from '../../..';
+import {Unicorn} from '.';
+
+expectType<JSX.Element>(<Unicorn rainbow='🌈' />);
+
+expectError(<Unicorn foo='bar' />);
diff --git a/source/test/fixtures/tsx/package.json b/source/test/fixtures/tsx/package.json
new file mode 100644
index 00000000..09392033
--- /dev/null
+++ b/source/test/fixtures/tsx/package.json
@@ -0,0 +1,10 @@
+{
+	"name": "foo",
+	"files": [
+		"index.js",
+		"index.d.ts"
+	],
+	"dependencies": {
+		"react": "*"
+	}
+}
diff --git a/source/test/test.ts b/source/test/test.ts
index 750f6543..12664087 100644
--- a/source/test/test.ts
+++ b/source/test/test.ts
@@ -7,7 +7,7 @@ test('throw if no type definition was found', async t => {
 });
 
 test('throw if no test is found', async t => {
-	await t.throwsAsync(m({cwd: path.join(__dirname, 'fixtures/no-test')}), 'The test file `index.test-d.ts` does not exist. Create one and try again.');
+	await t.throwsAsync(m({cwd: path.join(__dirname, 'fixtures/no-test')}), 'The test file `index.test-d.ts` or `index.test-d.tsx` does not exist. Create one and try again.');
 });
 
 test('return diagnostics', async t => {
@@ -91,19 +91,19 @@ test('overridden config defaults to `strict` if `strict` is not explicitly overr
 	t.is(column, 19);
 });
 
-test('fail if types are used from a lib that wasn\'t explicitly specified', async t => {
+test('fail if types are used from a lib that was not explicitly specified', async t => {
 	const diagnostics = await m({cwd: path.join(__dirname, 'fixtures/lib-config/failure-missing-lib')});
 
 	t.is(diagnostics.length, 2);
 
 	t.true(/failure-missing-lib\/index.d.ts$/.test(diagnostics[0].fileName));
-	t.is(diagnostics[0].message, 'Cannot find name \'Document\'.');
+	t.is(diagnostics[0].message, 'Cannot find name \'Window\'.');
 	t.is(diagnostics[0].severity, 'error');
 	t.is(diagnostics[0].line, 1);
-	t.is(diagnostics[0].column, 24);
+	t.is(diagnostics[0].column, 22);
 
 	t.true(/failure-missing-lib\/index.test-d.ts$/.test(diagnostics[1].fileName));
-	t.is(diagnostics[1].message, 'Cannot find name \'Document\'.');
+	t.is(diagnostics[1].message, 'Cannot find name \'Window\'.');
 	t.is(diagnostics[1].severity, 'error');
 	t.is(diagnostics[1].line, 4);
 	t.is(diagnostics[1].column, 11);
@@ -177,6 +177,12 @@ test('support default test directory', async t => {
 	t.true(diagnostics.length === 0);
 });
 
+test('support tsx in subdirectory', async t => {
+	const diagnostics = await m({cwd: path.join(__dirname, 'fixtures/test-directory/tsx')});
+
+	t.true(diagnostics.length === 0);
+});
+
 test('support setting a custom test directory', async t => {
 	const diagnostics = await m({cwd: path.join(__dirname, 'fixtures/test-directory/custom')});
 
@@ -244,3 +250,9 @@ test('missing import', async t => {
 	t.true(diagnostics[0].message === 'Cannot find name \'Primitive\'.');
 	t.true(diagnostics[0].severity === 'error');
 });
+
+test('tsx', async t => {
+	const diagnostics = await m({cwd: path.join(__dirname, 'fixtures/tsx')});
+
+	t.true(diagnostics.length === 0);
+});