fix(jest): fix ProjectConfig.transform type

types/jest/index.d.ts

@@ -13,6 +13,7 @@
 //                 Ahn <https://github.com/AhnpGit>
 //                 Josh Goldberg <https://github.com/joshuakgoldberg>
 //                 Bradley Ayers <https://github.com/bradleyayers>
+//                 Martin Hochel <https://github.com/hotell>
 // Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
 // TypeScript Version: 2.3
 
@@ -795,6 +796,7 @@ declare namespace jest {
 
     type SnapshotUpdateState = 'all' | 'new' | 'none';
 
+    // https://facebook.github.io/jest/docs/en/cli.html#options
     interface GlobalConfig {
         bail: boolean;
         collectCoverage: boolean;
@@ -824,6 +826,7 @@ declare namespace jest {
         watchman: boolean;
     }
 
+    // https://facebook.github.io/jest/docs/en/configuration.html#options
     interface ProjectConfig {
         automock: boolean;
         browser: boolean;
@@ -863,7 +866,7 @@ declare namespace jest {
         testRunner: string;
         testURL: string;
         timers: 'real' | 'fake';
-        transform: Array<[string, Path]>;
+        transform: {[regexpGlob: string]: string};
         transformIgnorePatterns: Glob[];
         unmockedModulePathPatterns: Maybe<string[]>;
         watchPathIgnorePatterns: string[];

types/jest/jest-tests.ts

@@ -731,3 +731,24 @@ test('moduleName 2', () => {
     const moduleName = require('../moduleName');
     expect(moduleName()).toEqual(2);
 });
+
+// Jest config
+{
+// tslint:disable-next-line:no-var-requires
+const {defaults} = require('jest-config') as {defaults: jest.ProjectConfig};
+
+const config: Partial<jest.ProjectConfig> = {
+  transform: {
+    '^.+\\.(ts|tsx)$': 'ts-jest'
+  },
+  testMatch: [
+    ...defaults.testMatch,
+    '**/__tests__/**/*.ts?(x)',
+    '**/?(*.)+(spec|test).ts?(x)'
+  ],
+  moduleFileExtensions: [...defaults.moduleFileExtensions, 'ts', 'tsx'],
+  globals: {
+    'ts-jest': {}
+  }
+};
+}