Add initial Flow annotations.

.eslintrc

@@ -18,6 +18,7 @@
     "comma-style": [2, "last"],
     "computed-property-spacing": [2, "never"],
     "eol-last": [2],
+    "max-len": [2, {"code": 80, "ignoreUrls": true, "ignorePattern": "^(\\s*const\\s.+=\\s*require\\s*\\(|\\s*it\\()"}],
     "no-const-assign": [2],
     "no-extra-parens": [2],
     "no-irregular-whitespace": [2],
@@ -28,6 +29,7 @@
     "prefer-arrow-callback": [2],
     "prefer-const": [2],
     "quotes": [2, "single", {"avoidEscape": true, "allowTemplateLiterals": true}],
+    "semi": [2, "always"],
     "space-before-blocks": [2],
     "space-before-function-paren": [2, "never"],
     "space-in-parens": [2, "never"]

.flowconfig

@@ -0,0 +1,10 @@
+[ignore]
+.*/packages/babel-plugin-jest-hoist/node_modules/fbjs/.*
+.*/examples/.*
+.*/website/.*
+
+[include]
+
+[libs]
+
+[options]

integration_tests/__tests__/snapshot-test.js

@@ -106,7 +106,7 @@ describe('Snapshot', () => {
       expect(infoSR).toMatch('4 total in 2 test suites');
     });
 
-    it('deletes the snapshot when a test does removes all the snapshots', () => {
+    it('deletes a snapshot when a test does removes all the snapshots', () => {
       const firstRun = runJest.json('snapshot', []);
 
       fs.writeFileSync(copyOfTestPath, emptyTest);

integration_tests/__tests__/stack_trace-test.js

@@ -89,9 +89,12 @@ describe('Stack Trace', () => {
     );
 
     // Make sure we show Jest's jest-resolve as part of the stack trace
+    /* eslint-disable max-len */
     expect(stdout).toMatch(
       /Error: Cannot find module 'this-module-does-not-exist' from 'test-error-test\.js'/
     );
+    /* eslint-enable max-len */
+
     expect(stdout).toMatch(
       /\s+at\s(?:.+?)\s\((?:.+?)jest-resolve\/src\/index\.js/
     );

integration_tests/promise_it/__tests__/promise_it-test.js

@@ -26,10 +26,13 @@ describe('promise it', () => {
     done();
   });
 
-  it('is bount to context object', () => {
+  it('is bound to context object', () => {
     return new Promise(resolve => {
       if (this.someContextValue !== 'value') {
-        throw new Error('expected this.someContextValue to be set', this.someContextValue);
+        throw new Error(
+          'expected this.someContextValue to be set: ' +
+          this.someContextValue
+        );
       }
       resolve();
     });

lerna.json

@@ -1,4 +1,7 @@
 {
-  "lerna": "2.0.0-beta.18",
-  "version": "12.1.1"
+  "lerna": "2.0.0-beta.19",
+  "version": "12.1.1",
+  "linkedFiles": {
+    "prefix": "/**\n * @flow\n */\n"
+  }
 }

package.json

@@ -7,8 +7,9 @@
     "eslint": "^2.12.0",
     "eslint-plugin-babel": "^3.2.0",
     "fbjs-scripts": "^0.7.1",
+    "flow-bin": "^0.27.0",
     "glob": "^7.0.3",
-    "lerna": "2.0.0-beta.18",
+    "lerna": "2.0.0-beta.19",
     "minimatch": "^3.0.0",
     "progress": "^1.1.8",
     "rimraf": "^2.5.2"

packages/jest-changed-files/src/__tests__/git-test.js

@@ -32,13 +32,13 @@ describe('gitChecker', () => {
 
   describe('isGitRepository', () => {
 
-    pit('returns null for non git repo folder', () => {
+    it('returns null for non git repo folder', () => {
       return git.isGitRepository(tmpdir).then(res => {
         expect(res).toBeNull();
       });
     });
 
-    pit('returns dirname for git repo folder', () => {
+    it('returns dirname for git repo folder', () => {
       childProcess.spawnSync('git', ['init', tmpdir]);
 
       return git.isGitRepository(tmpdir).then(res => {
@@ -53,13 +53,13 @@ describe('gitChecker', () => {
       childProcess.spawnSync('git', ['init', tmpdir]);
     });
 
-    pit('returns an empty array for git repo folder without modified files', () => {
+    it('returns an empty array for git repo folder without modified files', () => {
       return git.findChangedFiles(tmpdir).then(res => {
         expect(res).toEqual([]);
       });
     });
 
-    pit('returns an array of modified files for git repo folder', () => {
+    it('returns an array of modified files for git repo folder', () => {
       fs.writeFileSync(tmpfile);
       fs.writeFileSync(tmpfileNested);
 

packages/jest-cli/.npmignore

@@ -1,4 +1,3 @@
 __tests__
 __mocks__
 .haste_cache
-setup.js

packages/jest-cli/src/Runtime/Runtime.js

@@ -33,7 +33,8 @@ class Runtime {
     this._explicitShouldMock = Object.create(null);
     this._isCurrentlyExecutingManualMock = null;
     this._mockFactories = Object.create(null);
-    this._mocksPattern = config.mocksPattern ? new RegExp(config.mocksPattern) : null;
+    this._mocksPattern =
+      config.mocksPattern ? new RegExp(config.mocksPattern) : null;
     this._shouldAutoMock = config.automock;
     this._testRegex = new RegExp(config.testRegex.replace(/\//g, path.sep));
     this._virtualMocks = Object.create(null);

packages/jest-cli/src/Runtime/__tests__/Runtime-NODE_PATH-test.js

@@ -31,7 +31,7 @@ describe('Runtime', () => {
     };
   });
 
-  pit('uses NODE_PATH to find modules', () => {
+  it('uses NODE_PATH to find modules', () => {
     const nodePath = __dirname + '/NODE_PATH_dir';
     return createLocalRuntime(nodePath).then(runtime => {
       const exports = runtime.requireModuleOrMock(
@@ -42,7 +42,7 @@ describe('Runtime', () => {
     });
   });
 
-  pit('uses modulePaths to find modules', () => {
+  it('uses modulePaths to find modules', () => {
     const nodePath = __dirname + '/NODE_PATH_dir';
     return createLocalRuntime(null, {modulePaths: nodePath}).then(runtime => {
       const exports = runtime.requireModuleOrMock(
@@ -53,7 +53,7 @@ describe('Runtime', () => {
     });
   });
 
-  pit('finds modules in NODE_PATH containing multiple paths', () => {
+  it('finds modules in NODE_PATH containing multiple paths', () => {
     const nodePath =
       cwd + '/some/other/path' + path.delimiter + __dirname + '/NODE_PATH_dir';
     return createLocalRuntime(nodePath).then(runtime => {
@@ -65,7 +65,7 @@ describe('Runtime', () => {
     });
   });
 
-  pit('does not find modules if NODE_PATH is relative', () => {
+  it('does not find modules if NODE_PATH is relative', () => {
     const nodePath =
       cwd.substr(path.sep.length) + 'src/Runtime/__tests__/NODE_PATH_dir';
     return createLocalRuntime(nodePath).then(runtime => {

packages/jest-cli/src/Runtime/__tests__/Runtime-genMockFromModule-test.js

@@ -24,7 +24,7 @@ describe('Runtime', () => {
   });
 
   describe('genMockFromModule', () => {
-    pit('does not cause side effects in the rest of the module system when generating a mock', () =>
+    it('does not cause side effects in the rest of the module system when generating a mock', () =>
       createRuntime(__filename).then(runtime => {
         const testRequire = runtime.requireModule.bind(
           runtime,

packages/jest-cli/src/Runtime/__tests__/Runtime-getTestEnvData-test.js

@@ -29,15 +29,15 @@ describe('Runtime', () => {
     createRuntime = require('createRuntime');
   });
 
-  pit('passes config data through to jest.envData', () =>
+  it('passes config data through to jest.envData', () =>
     createRuntime(__filename, config).then(runtime => {
       const root = runtime.requireModule(runtime.__mockRootPath);
       const envData = root.jest.getTestEnvData();
       expect(envData).toEqual(config.testEnvData);
     })
   );
 
-  pit('freezes jest.envData object', () =>
+  it('freezes jest.envData object', () =>
     createRuntime(__filename, config).then(runtime => {
       const root = runtime.requireModule(runtime.__mockRootPath);
       const envData = root.jest.getTestEnvData();

packages/jest-cli/src/Runtime/__tests__/Runtime-jest-fn.js

@@ -24,7 +24,7 @@ describe('Runtime', () => {
   });
 
   describe('jest.fn', () => {
-    pit('creates mock functions', () =>
+    it('creates mock functions', () =>
       createRuntime(__filename).then(runtime => {
         const root = runtime.requireModule(runtime.__mockRootPath);
         const mock = root.jest.fn();
@@ -34,7 +34,7 @@ describe('Runtime', () => {
       })
     );
 
-    pit('creates mock functions with mock implementations', () =>
+    it('creates mock functions with mock implementations', () =>
       createRuntime(__filename).then(runtime => {
         const root = runtime.requireModule(runtime.__mockRootPath);
         const mock = root.jest.fn(string => string + ' implementation');

packages/jest-cli/src/Runtime/__tests__/Runtime-jsdom-env-test.js

@@ -21,7 +21,7 @@ describe('Runtime', () => {
   });
 
   describe('requireModule', () => {
-    pit('emulates a node stack trace during module load', () =>
+    it('emulates a node stack trace during module load', () =>
       createRuntime(__filename).then(runtime => {
         let hasThrown = false;
         try {
@@ -34,7 +34,7 @@ describe('Runtime', () => {
       })
     );
 
-    pit('emulates a node stack trace during function execution', () =>
+    it('emulates a node stack trace during function execution', () =>
       createRuntime(__filename).then(runtime => {
         let hasThrown = false;
         const sum = runtime.requireModule(
@@ -47,6 +47,7 @@ describe('Runtime', () => {
         } catch (err) {
           hasThrown = true;
 
+          /* eslint-disable max-len */
           if (process.platform === 'win32') {
             expect(err.stack).toMatch(
               /^Error: throwing fn\s+at sum.+Runtime\\__tests__\\test_root\\throwing-fn.js:12:9/
@@ -56,6 +57,7 @@ describe('Runtime', () => {
               /^Error: throwing fn\s+at sum.+Runtime\/__tests__\/test_root\/throwing-fn.js:12:9/
             );
           }
+          /* eslint-enable max-len */
         }
         expect(hasThrown).toBe(true);
       })

packages/jest-cli/src/Runtime/__tests__/Runtime-moduleDirectories-test.js

@@ -29,7 +29,7 @@ describe('Runtime', () => {
     createRuntime = require('createRuntime');
   });
 
-  pit('uses configured moduleDirectories', () =>
+  it('uses configured moduleDirectories', () =>
     createRuntime(__filename, {moduleDirectories}).then(runtime => {
       const exports = runtime.requireModule(
         runtime.__mockRootPath,
@@ -39,7 +39,7 @@ describe('Runtime', () => {
     })
   );
 
-  pit('resolves packages', () =>
+  it('resolves packages', () =>
     createRuntime(__filename, {moduleDirectories}).then(runtime => {
       const exports = runtime.requireModule(
         runtime.__mockRootPath,
@@ -49,7 +49,7 @@ describe('Runtime', () => {
     })
   );
 
-  pit('finds closest module from moduleDirectories', () =>
+  it('finds closest module from moduleDirectories', () =>
     createRuntime(__filename, {moduleDirectories}).then(runtime => {
       const exports = runtime.requireModule(
         path.join(rootDir, 'subdir2', 'MyModule.js'),
@@ -60,7 +60,7 @@ describe('Runtime', () => {
     })
   );
 
-  pit('only checks the configured directories', () =>
+  it('only checks the configured directories', () =>
     createRuntime(__filename, {moduleDirectories}).then(runtime => {
       expect(() => {
         runtime.requireModule(runtime.__mockRootPath, 'not-a-haste-package');

packages/jest-cli/src/Runtime/__tests__/Runtime-requireMock-test.js

@@ -24,7 +24,7 @@ describe('Runtime', () => {
   });
 
   describe('requireMock', () => {
-    pit('uses manual mocks before attempting to automock', () =>
+    it('uses manual mocks before attempting to automock', () =>
       createRuntime(__filename).then(runtime => {
         const exports = runtime.requireMock(
           runtime.__mockRootPath,
@@ -34,7 +34,7 @@ describe('Runtime', () => {
       })
     );
 
-    pit('can resolve modules that are only referenced from mocks', () =>
+    it('can resolve modules that are only referenced from mocks', () =>
       createRuntime(__filename).then(runtime => {
         const exports = runtime.requireMock(
           runtime.__mockRootPath,
@@ -46,7 +46,7 @@ describe('Runtime', () => {
       })
     );
 
-    pit('stores and re-uses manual mock exports', () =>
+    it('stores and re-uses manual mock exports', () =>
       createRuntime(__filename).then(runtime => {
         let exports = runtime.requireMock(
           runtime.__mockRootPath,
@@ -58,7 +58,7 @@ describe('Runtime', () => {
       })
     );
 
-    pit('automocks @providesModule modules without a manual mock', () =>
+    it('automocks @providesModule modules without a manual mock', () =>
       createRuntime(__filename).then(runtime => {
         const exports = runtime.requireMock(
           runtime.__mockRootPath,
@@ -68,7 +68,7 @@ describe('Runtime', () => {
       })
     );
 
-    pit('automocks relative-path modules without a file extension', () =>
+    it('automocks relative-path modules without a file extension', () =>
       createRuntime(__filename).then(runtime => {
         const exports = runtime.requireMock(
           __filename,
@@ -78,7 +78,7 @@ describe('Runtime', () => {
       })
     );
 
-    pit('automocks relative-path modules with a file extension', () =>
+    it('automocks relative-path modules with a file extension', () =>
       createRuntime(__filename).then(runtime => {
         const exports = runtime.requireMock(
           __filename,
@@ -88,7 +88,7 @@ describe('Runtime', () => {
       })
     );
 
-    pit('just falls back when loading a native module', () =>
+    it('just falls back when loading a native module', () =>
       createRuntime(__filename).then(runtime => {
         let error;
         // Okay so this is a really WAT way to test this, but we
@@ -111,7 +111,7 @@ describe('Runtime', () => {
       })
     );
 
-    pit('stores and re-uses automocked @providesModule exports', () =>
+    it('stores and re-uses automocked @providesModule exports', () =>
       createRuntime(__filename).then(runtime => {
         let exports = runtime.requireMock(
           runtime.__mockRootPath,
@@ -123,7 +123,7 @@ describe('Runtime', () => {
       })
     );
 
-    pit('stores and re-uses automocked relative-path modules', () =>
+    it('stores and re-uses automocked relative-path modules', () =>
       createRuntime(__filename).then(runtime => {
         let exports = runtime.requireMock(
           __filename,
@@ -138,7 +138,7 @@ describe('Runtime', () => {
       })
     );
 
-    pit('multiple node core modules returns correct module', () =>
+    it('multiple node core modules returns correct module', () =>
       createRuntime(__filename).then(runtime => {
         runtime.requireMock(runtime.__mockRootPath, 'fs');
         expect(
@@ -147,15 +147,15 @@ describe('Runtime', () => {
       })
     );
 
-    pit('throws on non-existent @providesModule modules', () =>
+    it('throws on non-existent @providesModule modules', () =>
       createRuntime(__filename).then(runtime => {
         expect(() => {
           runtime.requireMock(runtime.__mockRootPath, 'DoesntExist');
         }).toThrow();
       })
     );
 
-    pit('uses the closest manual mock when duplicates exist', () =>
+    it('uses the closest manual mock when duplicates exist', () =>
       createRuntime(__filename).then(runtime => {
         const exports1 = runtime.requireMock(
           runtime.__mockRootPath,