chore: use yargs's built-in version instead of rolling our own (#6215)

* chore: use yargs's built-in `version` instead of rolling our own

* link to PR

* don't provide custom version

CHANGELOG.md

@@ -163,6 +163,8 @@
 
 ### Chore & Maintenance
 
+* `[jest-cli]` Use yargs's built-in `version` instead of rolling our own
+  ([#6215](https://github.com/facebook/jest/pull/6215))
 * `[docs]` Add explanation on how to mock methods not implemented in JSDOM
 * `[jest-jasmine2]` Simplify `Env.execute` and TreeProcessor to setup and clean
   resources for the top suite the same way as for all of the children suites

integration-tests/__tests__/version.test.js

@@ -29,7 +29,7 @@ test('works with jest.config.js', () => {
   });
 
   const {status, stdout, stderr} = runJest(DIR, ['--version']);
-  expect(stdout).toMatch(/v\d{2}\.\d{1,2}\.\d{1,2}[\-\S]*$/);
+  expect(stdout).toMatch(/\d{2}\.\d{1,2}\.\d{1,2}[\-\S]*$/);
   // Only version gets printed and nothing else
   expect(stdout.split(/\n/)).toHaveLength(1);
   expect(stderr).toBe('');

jest

@@ -1,9 +1,10 @@
-#!/usr/bin/env node
-/**
- * Copyright (c) 2014-present, Facebook, Inc. All rights reserved.
- *
- * This source code is licensed under the MIT license found in the
- * LICENSE file in the root directory of this source tree.
- */
+#!/usr/bin/env sh
 
-require('./packages/jest-cli/bin/jest');
+: '
+Copyright (c) 2014-present, Facebook, Inc. All rights reserved.
+
+This source code is licensed under the MIT license found in the
+LICENSE file in the root directory of this source tree.
+'
+
+node ./packages/jest-cli/bin/jest "$@"

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

@@ -14,7 +14,6 @@ import type {GlobalConfig, Path, ProjectConfig} from 'types/Config';
 import {Console, clearLine, createDirectory} from 'jest-util';
 import {validateCLIOptions} from 'jest-validate';
 import {readConfig, deprecationEntries} from 'jest-config';
-import {version as VERSION} from '../../package.json';
 import * as args from './args';
 import chalk from 'chalk';
 import createContext from '../lib/create_context';
@@ -65,8 +64,6 @@ export const runCLI = async (
   const outputStream =
     argv.json || argv.useStderr ? process.stderr : process.stdout;
 
-  argv.version && printVersionAndExit(outputStream);
-
   const {globalConfig, configs, hasDeprecationWarnings} = getConfigs(
     projects,
     argv,
@@ -162,8 +159,7 @@ const buildArgv = (maybeArgv: ?Argv, project: ?Path) => {
     .alias('help', 'h')
     .options(args.options)
     .epilogue(args.docs)
-    .check(args.check)
-    .version(false).argv;
+    .check(args.check).argv;
 
   validateCLIOptions(
     argv,
@@ -210,11 +206,6 @@ const printDebugInfoAndExitIfNeeded = (
   }
 };
 
-const printVersionAndExit = outputStream => {
-  outputStream.write(`v${VERSION}\n`);
-  exit(0);
-};
-
 const ensureNoDuplicateConfigs = (parsedConfigs, projects, rootConfigPath) => {
   const configPathMap = new Map();