Ignore imports of types with typescript

e2e/__tests__/findRelatedFiles.test.js

@@ -83,6 +83,43 @@ describe('--findRelatedTests flag', () => {
     expect(stderr).toMatch(summaryMsg);
   });
 
+  test('ignores imports of types for typescript', () => {
+    writeFiles(DIR, {
+      '.watchmanconfig': '',
+      '__tests__/test.test.ts': `
+      import {SomeClassType} from "../c";
+      test('a', () => {});
+    `,
+      'c.ts': `
+      class SomeClass {}
+      export type SomeClassType = SomeClass;
+      `,
+      'package.json': JSON.stringify({jest: {testEnvironment: 'node'}}),
+    });
+
+    const {stderr, stdout} = runJest(DIR, ['--findRelatedTests', 'c.ts']);
+    expect(stdout).toMatch('Pattern: c.ts - 0 matches');
+    expect(stderr).toEqual('');
+  });
+
+  test('skips typescript type stripping for .js files', () => {
+    writeFiles(DIR, {
+      '.watchmanconfig': '',
+      '__tests__/test.test.js': `
+      import {SomeClassType} from "../c";
+      test('a', () => {});
+    `,
+      'c.js': `
+      class SomeClass {}
+      export type SomeClassType = SomeClass;
+      `,
+      'package.json': JSON.stringify({jest: {testEnvironment: 'node'}}),
+    });
+
+    const {stderr} = runJest(DIR, ['--findRelatedTests', 'c.js']);
+    expect(stderr).toMatch('SyntaxError: Unexpected token');
+  });
+
   test('generates coverage report for filename', () => {
     writeFiles(DIR, {
       '.watchmanconfig': '',

packages/jest-haste-map/package.json

@@ -8,6 +8,7 @@
   "license": "MIT",
   "main": "build/index.js",
   "dependencies": {
+    "@babel/plugin-transform-typescript": "^7.2.0",
     "fb-watchman": "^2.0.0",
     "graceful-fs": "^4.1.15",
     "invariant": "^2.2.4",

packages/jest-haste-map/src/worker.js

@@ -9,6 +9,7 @@
 
 import type {HasteImpl, WorkerMessage, WorkerMetadata} from './types';
 
+import * as babel from '@babel/core';
 import crypto from 'crypto';
 import path from 'path';
 import fs from 'graceful-fs';
@@ -17,6 +18,7 @@ import H from './constants';
 import * as dependencyExtractor from './lib/dependencyExtractor';
 
 const PACKAGE_JSON = path.sep + 'package.json';
+const TYPESCRIPT_EXTENSION = '.ts';
 
 let hasteImpl: ?HasteImpl = null;
 let hasteImplModulePath: ?string = null;
@@ -49,18 +51,35 @@ export async function worker(data: WorkerMessage): Promise<WorkerMetadata> {
 
   const {computeDependencies, computeSha1, rootDir, filePath} = data;
 
-  const getContent = (): string => {
+  const getJSONContent = (): string => {
     if (content === undefined) {
       content = fs.readFileSync(filePath, 'utf8');
     }
-
+    return content;
+  };
+  const getContent = (): string => {
+    if (content === undefined) {
+      if (filePath.endsWith(TYPESCRIPT_EXTENSION)) {
+        try {
+          const transformed = babel.transformFileSync(filePath, {
+            cwd: __dirname,
+            plugins: ['@babel/plugin-transform-typescript'],
+          });
+          content = transformed.code;
+        } catch (e) {
+          content = fs.readFileSync(filePath, 'utf8');
+        }
+      } else {
+        content = fs.readFileSync(filePath, 'utf8');
+      }
+    }
     return content;
   };
 
   if (filePath.endsWith(PACKAGE_JSON)) {
     // Process a package.json that is returned as a PACKAGE type with its name.
     try {
-      const fileData = JSON.parse(getContent());
+      const fileData = JSON.parse(getJSONContent());
 
       if (fileData.name) {
         const relativeFilePath = path.relative(rootDir, filePath);

yarn.lock

@@ -400,6 +400,13 @@
   dependencies:
     "@babel/helper-plugin-utils" "^7.0.0"
 
+"@babel/plugin-syntax-typescript@^7.2.0":
+  version "7.2.0"
+  resolved "https://registry.yarnpkg.com/@babel/plugin-syntax-typescript/-/plugin-syntax-typescript-7.2.0.tgz#55d240536bd314dcbbec70fd949c5cabaed1de29"
+  integrity sha512-WhKr6yu6yGpGcNMVgIBuI9MkredpVc7Y3YR4UzEZmDztHoL6wV56YBHLhWnjO1EvId1B32HrD3DRFc+zSoKI1g==
+  dependencies:
+    "@babel/helper-plugin-utils" "^7.0.0"
+
 "@babel/plugin-transform-arrow-functions@^7.0.0":
   version "7.0.0"
   resolved "https://registry.yarnpkg.com/@babel/plugin-transform-arrow-functions/-/plugin-transform-arrow-functions-7.0.0.tgz#a6c14875848c68a3b4b3163a486535ef25c7e749"
@@ -692,6 +699,14 @@
     "@babel/helper-plugin-utils" "^7.0.0"
     "@babel/plugin-syntax-typescript" "^7.0.0"
 
+"@babel/plugin-transform-typescript@^7.2.0":
+  version "7.2.0"
+  resolved "https://registry.yarnpkg.com/@babel/plugin-transform-typescript/-/plugin-transform-typescript-7.2.0.tgz#bce7c06300434de6a860ae8acf6a442ef74a99d1"
+  integrity sha512-EnI7i2/gJ7ZNr2MuyvN2Hu+BHJENlxWte5XygPvfj/MbvtOkWor9zcnHpMMQL2YYaaCcqtIvJUyJ7QVfoGs7ew==
+  dependencies:
+    "@babel/helper-plugin-utils" "^7.0.0"
+    "@babel/plugin-syntax-typescript" "^7.2.0"
+
 "@babel/plugin-transform-unicode-regex@^7.0.0":
   version "7.0.0"
   resolved "https://registry.yarnpkg.com/@babel/plugin-transform-unicode-regex/-/plugin-transform-unicode-regex-7.0.0.tgz#c6780e5b1863a76fe792d90eded9fcd5b51d68fc"
@@ -4503,7 +4518,7 @@ diacritics-map@^0.1.0:
   resolved "https://registry.yarnpkg.com/diacritics-map/-/diacritics-map-0.1.0.tgz#6dfc0ff9d01000a2edf2865371cac316e94977af"
   integrity sha1-bfwP+dAQAKLt8oZTccrDFulJd68=
 
-[email protected], diff@^3.2.0:
+[email protected]:
   version "3.5.0"
   resolved "https://registry.yarnpkg.com/diff/-/diff-3.5.0.tgz#800c0dd1e0a8bfbc95835c202ad220fe317e5a12"
   integrity sha512-A46qtFgd+g7pDZinpnwiRJtxbC1hpgf0uzP3iG89scHk0AUC7A1TGxf5OiiOUv/JMZR8GOt8hL900hV0bOy5xA==