chore: verify all packages have the same engine requirement (#9871)

.eslintrc.js

@@ -132,7 +132,7 @@ module.exports = {
           '**/__mocks__/**',
           '**/?(*.)(spec|test).js?(x)',
           'scripts/**',
-          'eslintImportResolver.js',
+          'babel.config.js',
           'testSetupFile.js',
         ],
       },

babel.config.js

@@ -5,6 +5,11 @@
  * LICENSE file in the root directory of this source tree.
  */
 
+const semver = require('semver');
+const pkg = require('./package.json');
+
+const supportedNodeVersion = semver.minVersion(pkg.engines.node).version;
+
 module.exports = {
   babelrcRoots: ['examples/*'],
   // we don't wanna run the transforms in this file over react native
@@ -15,7 +20,7 @@ module.exports = {
         'babel-plugin-typescript-strip-namespaces',
         'babel-plugin-replace-ts-export-assignment',
         require.resolve(
-          './scripts/babel-plugin-jest-replace-ts-require-assignment.js'
+          './scripts/babel-plugin-jest-replace-ts-require-assignment.js',
         ),
       ],
       presets: ['@babel/preset-typescript'],
@@ -31,7 +36,7 @@ module.exports = {
           {
             exclude: ['@babel/plugin-proposal-dynamic-import'],
             shippedProposals: true,
-            targets: {node: '8.3'},
+            targets: {node: supportedNodeVersion},
           },
         ],
       ],
@@ -48,7 +53,7 @@ module.exports = {
       '@babel/preset-env',
       {
         shippedProposals: true,
-        targets: {node: '8.3'},
+        targets: {node: supportedNodeVersion},
       },
     ],
   ],

e2e/__tests__/__snapshots__/each.test.ts.snap

@@ -205,7 +205,7 @@ FAIL __tests__/failure.test.js
       28 |   ({left, right}) => {
     > 29 |     expect(left).toBe(right);
          |                  ^
-      30 |   }
+      30 |   },
       31 | );
       32 |
 
@@ -222,7 +222,7 @@ FAIL __tests__/failure.test.js
       39 |   ({left, right}) => {
     > 40 |     expect(left).toBe(right);
          |                  ^
-      41 |   }
+      41 |   },
       42 | );
       43 |
 
@@ -239,7 +239,7 @@ FAIL __tests__/failure.test.js
       39 |   ({left, right}) => {
     > 40 |     expect(left).toBe(right);
          |                  ^
-      41 |   }
+      41 |   },
       42 | );
       43 |
 
@@ -256,7 +256,7 @@ FAIL __tests__/failure.test.js
       46 |   word => {
     > 47 |     expect(/z/.test(word)).toBe(true);
          |                            ^
-      48 |   }
+      48 |   },
       49 | );
       50 |
 
@@ -273,7 +273,7 @@ FAIL __tests__/failure.test.js
       46 |   word => {
     > 47 |     expect(/z/.test(word)).toBe(true);
          |                            ^
-      48 |   }
+      48 |   },
       49 | );
       50 |
 
@@ -290,7 +290,7 @@ FAIL __tests__/failure.test.js
       46 |   word => {
     > 47 |     expect(/z/.test(word)).toBe(true);
          |                            ^
-      48 |   }
+      48 |   },
       49 | );
       50 |
 
@@ -308,7 +308,7 @@ FAIL __tests__/failure.test.js
     > 59 |       expect(left).toBe(right);
          |                    ^
       60 |     });
-      61 |   }
+      61 |   },
       62 | );
 
       at Object.toBe (__tests__/failure.test.js:59:20)
@@ -325,7 +325,7 @@ FAIL __tests__/failure.test.js
     > 59 |       expect(left).toBe(right);
          |                    ^
       60 |     });
-      61 |   }
+      61 |   },
       62 | );
 
       at Object.toBe (__tests__/failure.test.js:59:20)
@@ -342,7 +342,7 @@ FAIL __tests__/failure.test.js
     > 71 |       expect(left).toBe(right);
          |                    ^
       72 |     });
-      73 |   }
+      73 |   },
       74 | );
 
       at Object.toBe (__tests__/failure.test.js:71:20)
@@ -359,7 +359,7 @@ FAIL __tests__/failure.test.js
     > 71 |       expect(left).toBe(right);
          |                    ^
       72 |     });
-      73 |   }
+      73 |   },
       74 | );
 
       at Object.toBe (__tests__/failure.test.js:71:20)

e2e/__tests__/__snapshots__/errorOnDeprecated.test.ts.snap

@@ -138,7 +138,7 @@ FAIL __tests__/jasmine.objectContaining.test.js
 
        9 | test('jasmine.objectContaining', () => {
       10 |   expect({input: 'trash', output: 'trash'}).toEqual(
-    > 11 |     jasmine.objectContaining({output: 'trash'})
+    > 11 |     jasmine.objectContaining({output: 'trash'}),
          |             ^
       12 |   );
       13 | });

e2e/__tests__/__snapshots__/expectAsyncMatcher.test.ts.snap

@@ -77,7 +77,7 @@ FAIL __tests__/failure.test.js
       21 | it('fail with expected promise values and not', () =>
     > 22 |   expect(Promise.resolve([1, 2])).resolves.not.toHaveLengthAsync(
          |                                                ^
-      23 |     Promise.resolve(2)
+      23 |     Promise.resolve(2),
       24 |   ));
       25 | 
 

e2e/__tests__/__snapshots__/toMatchInlineSnapshot.test.ts.snap

@@ -71,7 +71,7 @@ test('handles property matchers', () => {
     Object {
       "createdAt": Any<Date>,
     }
-  \`
+  \`,
   );
 });
 
@@ -85,7 +85,7 @@ expect({createdAt: "string"}).toMatchInlineSnapshot(
   Object {
     "createdAt": Any<Date>,
   }
-\`
+\`,
 );
 });
 `;
@@ -98,7 +98,7 @@ test('handles property matchers', () => {
     Object {
       "createdAt": Any<Date>,
     }
-  \`
+  \`,
   );
 });
 
@@ -112,7 +112,7 @@ test('handles property matchers', () => {
     Object {
       "createdAt": Any<String>,
     }
-  \`
+  \`,
   );
 });
 
@@ -192,7 +192,7 @@ test('removes obsolete external snapshots', () => {
 exports[`supports async matchers 1`] = `
 test('inline snapshots', async () => {
   expect(Promise.resolve('success')).resolves.toMatchInlineSnapshot(
-    \`"success"\`
+    \`"success"\`,
   );
   expect(Promise.reject('fail')).rejects.toMatchInlineSnapshot(\`"fail"\`);
 });
@@ -221,7 +221,7 @@ expect.extend({
         createdAt: expect.any(Date),
         id: expect.any(Number),
       },
-      ...args
+      ...args,
     );
   },
 });
@@ -242,7 +242,7 @@ test('inline snapshots', () => {
       "id": Any<Number>,
       "name": "LeBron James",
     }
-  \`
+  \`,
   );
   expect(user).toMatchUserInlineSnapshot(\`
     Object {

e2e/__tests__/__snapshots__/toThrowErrorMatchingInlineSnapshot.test.ts.snap

@@ -3,7 +3,7 @@
 exports[`should support rejecting promises 1`] = `
 test('should support rejecting promises', async () => {
   await expect(
-    Promise.reject(new Error('octopus'))
+    Promise.reject(new Error('octopus')),
   ).rejects.toThrowErrorMatchingInlineSnapshot(\`"octopus"\`);
 });
 

e2e/coverage-handlebars/__tests__/greet.js

@@ -8,6 +8,6 @@ const greet = require('../greet.hbs');
 
 test('am', () => {
   expect(greet({am: true, name: 'Joe'})).toEqual(
-    '<p>Good\n  morning\nJoe!</p>\n'
+    '<p>Good\n  morning\nJoe!</p>\n',
   );
 });

e2e/coverage-report/notRequiredInTestSuite.js

@@ -7,7 +7,7 @@
 
 throw new Error(
   `this error should not be a problem because` +
-    `this file is never required or executed`
+    `this file is never required or executed`,
 );
 
 // Flow annotations to make sure istanbul can instrument non ES6 source

e2e/custom-test-sequencer/testSequencerAsync.js

@@ -13,7 +13,7 @@ class CustomSequencer extends Sequencer {
       setTimeout(() => {
         const copyTests = Array.from(tests);
         resolve(
-          copyTests.sort((testA, testB) => (testA.path > testB.path ? 1 : -1))
+          copyTests.sort((testA, testB) => (testA.path > testB.path ? 1 : -1)),
         );
       }, 50);
     });

e2e/each/__tests__/describeOnly.test.js

@@ -23,5 +23,5 @@ describe.each([[false, true]])(
     it('fails', () => {
       expect(left).toBe(right);
     });
-  }
+  },
 );

e2e/each/__tests__/eachException.test.js

@@ -13,7 +13,7 @@ it.each`
   'throws exception when one argument too few are supplied $left == $right',
   ({left, right}) => {
     expect(left).toBe(right);
-  }
+  },
 );
 
 it.each`
@@ -23,5 +23,5 @@ it.each`
   'throws exception when not enough arguments are supplied $left == $right',
   ({left, right}) => {
     expect(left).toBe(right);
-  }
+  },
 );

e2e/each/__tests__/eachOnly.test.js

@@ -37,5 +37,5 @@ it.each`
   'Should not be ran: fails all rows expected $left == $right',
   ({left, right}) => {
     expect(left).toBe(right);
-  }
+  },
 );

e2e/each/__tests__/eachSkip.test.js

@@ -35,7 +35,7 @@ it.skip.each`
   'Should not be ran: fails all rows expected $left == $right',
   ({left, right}) => {
     expect(left).toBe(right);
-  }
+  },
 );
 
 describe.skip.each([

e2e/each/__tests__/failure.test.js

@@ -27,7 +27,7 @@ it.each`
   'template table fails on one row expected: $left == $right',
   ({left, right}) => {
     expect(left).toBe(right);
-  }
+  },
 );
 
 it.each`
@@ -38,14 +38,14 @@ it.each`
   'template table fails on all rows expected: $left == $right',
   ({left, right}) => {
     expect(left).toBe(right);
-  }
+  },
 );
 
 test.each(['red', 'green', 'bean'])(
   "The word %s contains the letter 'z'",
   word => {
     expect(/z/.test(word)).toBe(true);
-  }
+  },
 );
 
 describe.each`
@@ -58,7 +58,7 @@ describe.each`
     it('fails ', () => {
       expect(left).toBe(right);
     });
-  }
+  },
 );
 
 describe.each([
@@ -70,5 +70,5 @@ describe.each([
     it('fails', () => {
       expect(left).toBe(right);
     });
-  }
+  },
 );

e2e/each/__tests__/success.test.js

@@ -9,7 +9,7 @@ test.each(['red', 'green', 'bean'])(
   "The word %s contains the letter 'e'",
   word => {
     expect(/e/.test(word)).toBe(true);
-  }
+  },
 );
 
 it.each([

e2e/error-on-deprecated/__tests__/jasmine.objectContaining.test.js

@@ -8,6 +8,6 @@
 
 test('jasmine.objectContaining', () => {
   expect({input: 'trash', output: 'trash'}).toEqual(
-    jasmine.objectContaining({output: 'trash'})
+    jasmine.objectContaining({output: 'trash'}),
   );
 });

e2e/expect-async-matcher/__tests__/failure.test.js

@@ -20,5 +20,5 @@ it('fail with expected promise values', () =>
 
 it('fail with expected promise values and not', () =>
   expect(Promise.resolve([1, 2])).resolves.not.toHaveLengthAsync(
-    Promise.resolve(2)
+    Promise.resolve(2),
   ));

e2e/expect-async-matcher/__tests__/success.test.js

@@ -20,5 +20,5 @@ it('works with expected promise values', () =>
 
 it('works with expected promise values and not', () =>
   expect(Promise.resolve([1, 2])).resolves.not.toHaveLengthAsync(
-    Promise.resolve(1)
+    Promise.resolve(1),
   ));

e2e/expect-async-matcher/matchers.js

@@ -8,7 +8,7 @@
 
 export async function toHaveLengthAsync(
   received: any,
-  lengthPromise: Promise<number>
+  lengthPromise: Promise<number>,
 ) {
   const length = await lengthPromise;
 

e2e/expect-in-vm/__tests__/expect-in-vm.test.js

@@ -14,7 +14,7 @@ it('correctly expects RegExp inside a new VM context', () => {
     `(function(require, module, exports, __dirname, __filename, expect) {
   expect('ab12cd').toMatch(/ab12cd/);
 })`,
-    global
+    global,
   );
 
   const module = {
@@ -28,6 +28,6 @@ it('correctly expects RegExp inside a new VM context', () => {
     module.exports,
     __dirname,
     __filename,
-    expect
+    expect,
   );
 });

e2e/jasmine-async/__tests__/promiseBeforeAll.test.js

@@ -15,7 +15,7 @@ describe('promise beforeAll', () => {
       process.nextTick(resolve);
     }).then(() => {
       flag = 1;
-    })
+    }),
   );
 
   beforeAll(() => new Promise(resolve => setTimeout(resolve, 10)), 500);

e2e/jasmine-async/__tests__/promiseBeforeEach.test.js

@@ -13,7 +13,7 @@ describe('promise beforeEach', () => {
       process.nextTick(resolve);
     }).then(() => {
       this.flag = 1;
-    })
+    }),
   );
 
   // passing tests

e2e/jasmine-async/__tests__/promiseIt.test.js

@@ -31,7 +31,7 @@ describe('promise it', () => {
     new Promise(resolve => {
       if (this.someContextValue !== 'value') {
         throw new Error(
-          'expected this.someContextValue to be set: ' + this.someContextValue
+          'expected this.someContextValue to be set: ' + this.someContextValue,
         );
       }
       resolve();
@@ -90,13 +90,13 @@ describe('promise it', () => {
   it(
     'succeeds if the test finishes in time',
     () => new Promise(resolve => setTimeout(resolve, 10)),
-    250
+    250,
   );
 
   // failing tests
   it(
     'fails if a custom timeout is exceeded',
     () => new Promise(resolve => setTimeout(resolve, 100)),
-    10
+    10,
   );
 });

e2e/native-esm/__tests__/native-esm.test.js

@@ -21,7 +21,7 @@ test('should have correct import.meta', () => {
     url: expect.any(String),
   });
   expect(
-    import.meta.url.endsWith('/e2e/native-esm/__tests__/native-esm.test.js')
+    import.meta.url.endsWith('/e2e/native-esm/__tests__/native-esm.test.js'),
   ).toBe(true);
 });
 

e2e/reset-modules/__tests__/resetModules.test.js

@@ -12,7 +12,7 @@ global.testObject = new Proxy(
     get: function getter(target, key) {
       return key;
     },
-  }
+  },
 );
 test('jest.resetModules should not error when _isMockFunction is defined but not boolean', () => {
   jest.resetModules();

e2e/resolve-with-paths/__tests__/resolveWithPaths.test.js

@@ -10,19 +10,19 @@ import {resolve} from 'path';
 
 test('finds a module relative to one of the given paths', () => {
   expect(require.resolve('./mod.js', {paths: ['../dir']})).toEqual(
-    resolve(__dirname, '..', 'dir', 'mod.js')
+    resolve(__dirname, '..', 'dir', 'mod.js'),
   );
 });
 
 test('finds a module without a leading "./" relative to one of the given paths', () => {
   expect(require.resolve('mod.js', {paths: ['../dir']})).toEqual(
-    resolve(__dirname, '..', 'dir', 'mod.js')
+    resolve(__dirname, '..', 'dir', 'mod.js'),
   );
 });
 
 test('finds a node_module above one of the given paths', () => {
   expect(require.resolve('mod', {paths: ['../dir']})).toEqual(
-    resolve(__dirname, '..', 'node_modules', 'mod', 'index.js')
+    resolve(__dirname, '..', 'node_modules', 'mod', 'index.js'),
   );
 });
 
@@ -32,12 +32,12 @@ test('finds a native node module when paths are given', () => {
 
 test('throws an error if the module cannot be found from given paths', () => {
   expect(() => require.resolve('./mod.js', {paths: ['..']})).toThrowError(
-    "Cannot resolve module './mod.js' from paths ['..'] from "
+    "Cannot resolve module './mod.js' from paths ['..'] from ",
   );
 });
 
 test('throws module not found error if the module cannot be found from given paths', () => {
   expect(() => require.resolve('./mod.js', {paths: ['..']})).toThrow(
-    expect.objectContaining({code: 'MODULE_NOT_FOUND'})
+    expect.objectContaining({code: 'MODULE_NOT_FOUND'}),
   );
 });

e2e/resolve/__tests__/resolve.test.js

@@ -66,7 +66,7 @@ test('should resolve filename.json', () => {
 
 test('should preserve identity for symlinks', () => {
   expect(require('../../../packages/jest-resolve')).toBe(
-    require('jest-resolve')
+    require('jest-resolve'),
   );
 });
 
@@ -113,7 +113,7 @@ test('should throw module not found error if the module has dependencies that ca
           Test7.js
           __tests__/resolve.test.js\n
         `,
-    })
+    }),
   );
 });
 
@@ -122,6 +122,6 @@ test('should throw module not found error if the module cannot be found', () =>
     expect.objectContaining({
       code: 'MODULE_NOT_FOUND',
       message: "Cannot find module 'Test8' from 'resolve.test.js'",
-    })
+    }),
   );
 });

e2e/snapshot/__tests__/snapshot.test.js

@@ -30,7 +30,7 @@ describe('snapshot', () => {
 
   it('cannot be used with .not', () => {
     expect(() => expect('').not.toMatchSnapshot()).toThrow(
-      'Snapshot matchers cannot be used with not'
+      'Snapshot matchers cannot be used with not',
     );
   });
 

e2e/typescript-coverage/typescriptPreprocessor.js

@@ -17,7 +17,7 @@ module.exports = {
           module: tsc.ModuleKind.CommonJS,
         },
         path,
-        []
+        [],
       );
     }
     return src;

examples/angular/app.component.spec.ts

@@ -8,7 +8,7 @@ const getTitleFn = jest.fn().mockReturnValue(title);
 const dataServiceSpy = jest.fn().mockImplementation(
   (): Partial<DataService> => ({
     getTitle: getTitleFn,
-  })
+  }),
 );
 
 describe('AppComponent', () => {
@@ -36,7 +36,7 @@ describe('AppComponent', () => {
     fixture.detectChanges();
     const compiled = fixture.debugElement.nativeElement;
     expect(compiled.querySelector('h1').textContent).toContain(
-      `Welcome to ${title}!`
+      `Welcome to ${title}!`,
     );
   });
 });

examples/angular/setupJest.js

@@ -14,5 +14,5 @@ const testingModule = require('@angular/platform-browser-dynamic/testing');
 
 getTestBed().initTestEnvironment(
   testingModule.BrowserDynamicTestingModule,
-  testingModule.platformBrowserDynamicTesting()
+  testingModule.platformBrowserDynamicTesting(),
 );

examples/async/__mocks__/request.js

@@ -15,7 +15,7 @@ export default function request(url) {
         ? resolve(users[userID])
         : reject({
             error: 'User with ' + userID + ' not found.',
-          })
+          }),
     );
   });
 }

examples/async/__tests__/user.test.js

@@ -45,7 +45,7 @@ test('tests error with promises', async () => {
   return user.getUserName(2).catch(e =>
     expect(e).toEqual({
       error: 'User with 2 not found.',
-    })
+    }),
   );
 });
 

examples/manual-mocks/__tests__/file_summarizer.test.js

@@ -18,7 +18,7 @@ describe('listFilesInDirectorySync', () => {
   it('includes all files in the directory in the summary', () => {
     const FileSummarizer = require('../FileSummarizer');
     const fileSummary = FileSummarizer.summarizeFilesInDirectorySync(
-      '/path/to'
+      '/path/to',
     );
 
     expect(fileSummary.length).toBe(2);

examples/react-native/__tests__/intro.test.js

@@ -52,7 +52,7 @@ it('renders the FlatList component', () => {
         data={['apple', 'banana', 'kiwi']}
         keyExtractor={item => item}
         renderItem={({item}) => <Text>{item}</Text>}
-      />
+      />,
     )
     .toJSON();
   expect(tree).toMatchSnapshot();

examples/react-testing-library/__tests__/CheckboxWithLabel-test.js

@@ -10,7 +10,7 @@ afterEach(cleanup);
 
 it('CheckboxWithLabel changes the text after click', () => {
   const {queryByLabelText, getByLabelText} = render(
-    <CheckboxWithLabel labelOn="On" labelOff="Off" />
+    <CheckboxWithLabel labelOn="On" labelOff="Off" />,
   );
 
   expect(queryByLabelText(/off/i)).toBeTruthy();

examples/react/__tests__/CheckboxWithLabel-test.js

@@ -15,7 +15,7 @@ it('CheckboxWithLabel changes the text after click', () => {
       inputRef={checkboxInputRef}
       labelOn="On"
       labelOff="Off"
-    />
+    />,
   );
 
   const labelNode = checkboxLabelRef.current;

examples/snapshot/__tests__/link.react.test.js

@@ -27,7 +27,7 @@ it('properly escapes quotes', () => {
 
 it('changes the class when hovered', () => {
   const component = renderer.create(
-    <Link page="http://www.facebook.com">Facebook</Link>
+    <Link page="http://www.facebook.com">Facebook</Link>,
   );
   let tree = component.toJSON();
   expect(tree).toMatchSnapshot();

examples/typescript/__tests__/CheckboxWithLabel-test.tsx

@@ -15,7 +15,7 @@ it('CheckboxWithLabel changes the text after click', () => {
       inputRef={checkboxInputRef}
       labelOn="On"
       labelOff="Off"
-    />
+    />,
   );
 
   const labelNode = checkboxLabelRef.current;

package.json

@@ -74,6 +74,7 @@
     "realpath-native": "^2.0.0",
     "resolve": "^1.15.0",
     "rimraf": "^3.0.0",
+    "semver": "^6.3.0",
     "slash": "^3.0.0",
     "string-length": "^3.1.0",
     "strip-ansi": "^6.0.0",
@@ -126,22 +127,8 @@
     "arrowParens": "avoid",
     "overrides": [
       {
-        "excludeFiles": [
-          "e2e/__tests__/**/*",
-          "website/versioned_docs/**/*.md"
-        ],
-        "files": [
-          "examples/**/*",
-          "scripts/**/*",
-          "e2e/*/**/*",
-          "website/*.js",
-          "website/*/**/*",
-          "eslintImportResolver.js",
-          "babel.config.js"
-        ],
+        "files": "website/**/*.js",
         "options": {
-          "printWidth": 80,
-          "singleQuote": true,
           "trailingComma": "es5"
         }
       }

packages/test-utils/package.json

@@ -19,5 +19,8 @@
     "ansi-regex": "^5.0.0",
     "ansi-styles": "^4.1.0",
     "semver": "^6.3.0"
+  },
+  "engines": {
+    "node": ">= 8.3"
   }
 }

scripts/babel-plugin-jest-native-globals.js

@@ -70,7 +70,7 @@ module.exports = ({template}) => {
           path.node.name === 'fs' &&
           path.parent.property &&
           ['readFileSync', 'writeFileSync', 'existsSync'].includes(
-            path.parent.property.name
+            path.parent.property.name,
           )
         ) {
           if (

scripts/babel-plugin-jest-replace-ts-require-assignment.js

@@ -23,7 +23,7 @@ module.exports = ({template}) => {
           moduleExportsDeclaration({
             IMPORT: node.moduleReference.expression,
             NAME: node.id,
-          })
+          }),
         );
       },
     },

scripts/browserBuild.js

@@ -62,7 +62,7 @@ function browserBuild(pkgName, entryPath, destination) {
           alias: {
             chalk: path.resolve(
               __dirname,
-              '../packages/expect/build/fakeChalk.js'
+              '../packages/expect/build/fakeChalk.js',
             ),
           },
           extensions: ['.js', '.json', '.ts'],
@@ -78,7 +78,7 @@ function browserBuild(pkgName, entryPath, destination) {
           return;
         }
         resolve(stats);
-      }
+      },
     );
   });
 }

scripts/build.js

@@ -84,7 +84,7 @@ function buildBrowserPackage(p) {
   if (browser) {
     if (browser.indexOf(BUILD_ES5_DIR) !== 0) {
       throw new Error(
-        `browser field for ${pkgJsonPath} should start with "${BUILD_ES5_DIR}"`
+        `browser field for ${pkgJsonPath} should start with "${BUILD_ES5_DIR}"`,
       );
     }
     let indexFile = path.resolve(srcDir, 'index.js');
@@ -113,7 +113,7 @@ function buildFile(file, silent) {
       process.stdout.write(
         chalk.dim('  \u2022 ') +
           path.relative(PACKAGES_DIR, file) +
-          ' (ignore)\n'
+          ' (ignore)\n',
       );
     return;
   }
@@ -131,7 +131,7 @@ function buildFile(file, silent) {
           chalk.red(' \u21D2 ') +
           path.relative(PACKAGES_DIR, destPath) +
           ' (copy)' +
-          '\n'
+          '\n',
       );
   } else {
     const options = Object.assign({}, transformOptions);
@@ -141,7 +141,7 @@ function buildFile(file, silent) {
       // The modules in the blacklist are injected into the user's sandbox
       // We need to guard some globals there.
       options.plugins.push(
-        require.resolve('./babel-plugin-jest-native-globals')
+        require.resolve('./babel-plugin-jest-native-globals'),
       );
     } else {
       options.plugins = options.plugins.map(plugin => {
@@ -174,7 +174,7 @@ function buildFile(file, silent) {
           path.relative(PACKAGES_DIR, file) +
           chalk.green(' \u21D2 ') +
           path.relative(PACKAGES_DIR, destPath) +
-          '\n'
+          '\n',
       );
   }
 }

scripts/buildTs.js

@@ -7,6 +7,7 @@
 
 'use strict';
 
+const assert = require('assert');
 const fs = require('fs');
 const os = require('os');
 const path = require('path');
@@ -20,25 +21,23 @@ const {getPackages} = require('./buildUtils');
 const packages = getPackages();
 
 const packagesWithTs = packages.filter(p =>
-  fs.existsSync(path.resolve(p, 'tsconfig.json'))
+  fs.existsSync(path.resolve(p, 'tsconfig.json')),
 );
 
 packagesWithTs.forEach(pkgDir => {
   const pkg = require(pkgDir + '/package.json');
 
-  if (!pkg.types) {
-    throw new Error(`Package ${pkg.name} is missing \`types\` field`);
-  }
+  assert.ok(pkg.types, `Package ${pkg.name} is missing \`types\` field`);
+  assert.ok(
+    pkg.typesVersions,
+    `Package ${pkg.name} is missing \`typesVersions\` field`,
+  );
 
-  if (!pkg.typesVersions) {
-    throw new Error(`Package ${pkg.name} is missing \`typesVersions\` field`);
-  }
-
-  if (pkg.main.replace(/\.js$/, '.d.ts') !== pkg.types) {
-    throw new Error(
-      `\`main\` and \`types\` field of ${pkg.name} does not match`
-    );
-  }
+  assert.equal(
+    pkg.types,
+    pkg.main.replace(/\.js$/, '.d.ts'),
+    `\`main\` and \`types\` field of ${pkg.name} does not match`,
+  );
 });
 
 const args = [
@@ -54,11 +53,11 @@ console.log(chalk.inverse(' Building TypeScript definition files '));
 try {
   execa.sync('yarn', args, {stdio: 'inherit'});
   console.log(
-    chalk.inverse.green(' Successfully built TypeScript definition files ')
+    chalk.inverse.green(' Successfully built TypeScript definition files '),
   );
 } catch (e) {
   console.error(
-    chalk.inverse.red(' Unable to build TypeScript definition files ')
+    chalk.inverse.red(' Unable to build TypeScript definition files '),
   );
   console.error(e.stack);
   process.exitCode = 1;
@@ -79,19 +78,19 @@ Promise.all(
       rimraf.sync(path.resolve(pkgDir, 'build/ts3.4'));
 
       return execa('yarn', downlevelArgs, {cwd: pkgDir, stdio: 'inherit'});
-    })
-  )
+    }),
+  ),
 )
   .then(() => {
     console.log(
       chalk.inverse.green(
-        ' Successfully downleveled TypeScript definition files '
-      )
+        ' Successfully downleveled TypeScript definition files ',
+      ),
     );
   })
   .catch(e => {
     console.error(
-      chalk.inverse.red(' Unable to downlevel TypeScript definition files ')
+      chalk.inverse.red(' Unable to downlevel TypeScript definition files '),
     );
     console.error(e.stack);
     process.exitCode = 1;

scripts/buildUtils.js

@@ -5,10 +5,14 @@
  * LICENSE file in the root directory of this source tree.
  */
 
+'use strict';
+
+const assert = require('assert');
 const fs = require('fs');
 const path = require('path');
 const chalk = require('chalk');
 const stringLength = require('string-length');
+const rootPackage = require('../package.json');
 
 const PACKAGES_DIR = path.resolve(__dirname, '../packages');
 
@@ -16,10 +20,26 @@ const OK = chalk.reset.inverse.bold.green(' DONE ');
 
 // Get absolute paths of all directories under packages/*
 module.exports.getPackages = function getPackages() {
-  return fs
+  const packages = fs
     .readdirSync(PACKAGES_DIR)
     .map(file => path.resolve(PACKAGES_DIR, file))
     .filter(f => fs.lstatSync(path.resolve(f)).isDirectory());
+
+  const nodeEngineRequiremnt = rootPackage.engines.node;
+
+  packages.forEach(packageDir => {
+    const pkg = require(`${packageDir}/package.json`);
+
+    assert.ok(pkg.engines, `Engine requirement in ${pkg.name} should exist`);
+
+    assert.equal(
+      pkg.engines.node,
+      nodeEngineRequiremnt,
+      `Engine requirement in ${pkg.name} should match root`,
+    );
+  });
+
+  return packages;
 };
 
 module.exports.adjustToTerminalWidth = function adjustToTerminalWidth(str) {

scripts/checkCopyrightHeaders.js

@@ -140,7 +140,7 @@ function check() {
       !IGNORED_PATTERNS.some(pattern => pattern.test(file)) &&
       !isDirectory(file) &&
       !isBinaryFileSync(file) &&
-      needsCopyrightHeader(file)
+      needsCopyrightHeader(file),
   );
 
   if (invalidFiles.length > 0) {

scripts/mapCoverage.js

@@ -35,17 +35,17 @@ const map = istanbulCoverage.createCoverageMap();
 const mapFileCoverage = fileCoverage => {
   fileCoverage.path = fileCoverage.path.replace(
     /(.*packages\/.*\/)(build)(\/.*)/,
-    '$1src$3'
+    '$1src$3',
   );
   return fileCoverage;
 };
 
 Object.keys(coverage).forEach(filename =>
-  map.addFileCoverage(mapFileCoverage(coverage[filename]))
+  map.addFileCoverage(mapFileCoverage(coverage[filename])),
 );
 
 const context = istanbulReport.createContext({coverageMap: map});
 
 ['json', 'lcov', 'text'].forEach(reporter =>
-  istanbulReports.create(reporter, {}).execute(context)
+  istanbulReports.create(reporter, {}).execute(context),
 );

scripts/verifyOldTs.js

@@ -35,16 +35,16 @@ try {
   execa.sync('yarn', ['add', 'typescript@~3.4'], {cwd, stdio: 'inherit'});
   fs.writeFileSync(
     path.join(cwd, 'tsconfig.json'),
-    JSON.stringify(tsConfig, null, 2)
+    JSON.stringify(tsConfig, null, 2),
   );
   fs.writeFileSync(
     path.join(cwd, 'index.ts'),
-    `import jest = require('${jestDirectory}');`
+    `import jest = require('${jestDirectory}');`,
   );
   execa.sync('yarn', ['tsc', '--project', '.'], {cwd, stdio: 'inherit'});
 
   console.log(
-    chalk.inverse.green(' Successfully compiled Jest with TypeScript 3.4 ')
+    chalk.inverse.green(' Successfully compiled Jest with TypeScript 3.4 '),
   );
 } finally {
   rimraf.sync(cwd);

scripts/watch.js

@@ -34,7 +34,7 @@ chokidar
     {
       ignoreInitial: true,
       ignored: /(^|[\/\\])\../, // ignore dotfiles
-    }
+    },
   )
   .on('all', (event, filePath) => {
     if (
@@ -43,7 +43,7 @@ chokidar
     ) {
       console.log(
         chalk.green('->'),
-        `${event}: ${path.relative(PACKAGES_DIR, filePath)}`
+        `${event}: ${path.relative(PACKAGES_DIR, filePath)}`,
       );
       rebuild(filePath);
     } else {
@@ -51,7 +51,7 @@ chokidar
       const buildFile = filePath
         .replace(
           path.join(path.sep, 'src', path.sep),
-          path.join(path.sep, 'build', path.sep)
+          path.join(path.sep, 'build', path.sep),
         )
         .replace(/\.ts$/, '.js');
       try {
@@ -59,8 +59,8 @@ chokidar
         process.stdout.write(
           `${chalk.red('  \u2022 ')}${path.relative(
             PACKAGES_DIR,
-            buildFile
-          )} (deleted)\n`
+            buildFile,
+          )} (deleted)\n`,
         );
       } catch (e) {}
     }