Add projects option, rename initial config to options.

packages/jest-cli/src/TestRunner.js

@@ -17,7 +17,7 @@ import type {
 import type {GlobalConfig} from 'types/Config';
 import type {Context} from 'types/Context';
 import type {PathPattern} from './SearchSource';
-import type {Test, Tests} from 'types/TestRunner';
+import type {Test} from 'types/TestRunner';
 import type BaseReporter from './reporters/BaseReporter';
 
 const {formatExecError} = require('jest-message-util');
@@ -75,7 +75,7 @@ class TestRunner {
     this._dispatcher.unregister(ReporterClass);
   }
 
-  async runTests(tests: Tests, watcher: TestWatcher) {
+  async runTests(tests: Array<Test>, watcher: TestWatcher) {
     const timings = [];
     const contexts = new Set();
     tests.forEach(test => {
@@ -183,7 +183,7 @@ class TestRunner {
   }
 
   _createInBandTestRun(
-    tests: Tests,
+    tests: Array<Test>,
     watcher: TestWatcher,
     onResult: OnTestSuccess,
     onFailure: OnTestFailure,
@@ -214,7 +214,7 @@ class TestRunner {
   }
 
   _createParallelTestRun(
-    tests: Tests,
+    tests: Array<Test>,
     watcher: TestWatcher,
     onResult: OnTestSuccess,
     onFailure: OnTestFailure,

packages/jest-cli/src/TestSequencer.js

@@ -11,7 +11,7 @@
 
 import type {AggregatedResult} from 'types/TestResult';
 import type {Context} from 'types/Context';
-import type {Test, Tests} from 'types/TestRunner';
+import type {Test} from 'types/TestRunner';
 
 const fs = require('fs');
 const getCacheFilePath = require('jest-haste-map').getCacheFilePath;
@@ -57,7 +57,7 @@ class TestSequencer {
   // After a test run we store the time it took to run a test and on
   // subsequent runs we use that to run the slowest tests first, yielding the
   // fastest results.
-  sort(tests: Tests): Tests {
+  sort(tests: Array<Test>): Array<Test> {
     const stats = {};
     const fileSize = test =>
       stats[test.path] || (stats[test.path] = fs.statSync(test.path).size);
@@ -85,7 +85,7 @@ class TestSequencer {
     });
   }
 
-  cacheResults(tests: Tests, results: AggregatedResult) {
+  cacheResults(tests: Array<Test>, results: AggregatedResult) {
     const map = Object.create(null);
     tests.forEach(test => (map[test.path] = test));
     results.testResults.forEach(testResult => {

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

@@ -113,11 +113,6 @@ const options = {
     description: 'Use this flag to show full diffs instead of a patch.',
     type: 'boolean',
   },
-  experimentalProjects: {
-    description: 'A list of projects that use Jest to run all tests in a ' +
-      'single run.',
-    type: 'array',
-  },
   findRelatedTests: {
     description: 'Find related tests for a list of source files that were ' +
       'passed in as arguments. Useful for pre-commit hook integration to run ' +
@@ -181,6 +176,11 @@ const options = {
       'also specified.',
     type: 'string',
   },
+  projects: {
+    description: 'A list of projects that use Jest to run all tests of all ' +
+      'projects in a single instance of Jest.',
+    type: 'array',
+  },
   runInBand: {
     alias: 'i',
     description: 'Run all tests serially in the current process (rather than ' +

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

@@ -19,7 +19,7 @@ const runCLI = require('./runCLI');
 const validateCLIOptions = require('jest-util').validateCLIOptions;
 const yargs = require('yargs');
 
-function run(argv?: Object, root?: Path) {
+function run(argv?: Object, project?: Path) {
   argv = yargs(argv || process.argv.slice(2))
     .usage(args.usage)
     .help()
@@ -36,16 +36,15 @@ function run(argv?: Object, root?: Path) {
     return;
   }
 
-  if (!root) {
-    root = pkgDir.sync();
+  if (!project) {
+    project = pkgDir.sync();
   }
 
-  argv.projects = argv.experimentalProjects;
   if (!argv.projects) {
-    argv.projects = [root];
+    argv.projects = [project];
   }
 
-  const execute = argv.projects.length === 1 ? getJest(root).runCLI : runCLI;
+  const execute = argv.projects.length === 1 ? getJest(project).runCLI : runCLI;
   execute(argv, argv.projects, result => {
     const code = !result || result.success ? 0 : 1;
     process.on('exit', () => process.exit(code));

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

@@ -31,7 +31,7 @@ const VERSION = require('../../package.json').version;
 
 module.exports = async (
   argv: Object,
-  roots: Array<Path>,
+  projects: Array<Path>,
   onComplete: (results: ?AggregatedResult) => void,
 ) => {
   const realFs = require('fs');
@@ -91,19 +91,43 @@ module.exports = async (
   };
 
   try {
-    const configs = await Promise.all(
-      roots.map(root => readConfig(argv, root)),
-    );
+    let globalConfig;
+    let hasDeprecationWarnings;
+    let configs = [];
+    let config;
+    if (projects.length === 1) {
+      ({config, globalConfig, hasDeprecationWarnings} = await readConfig(
+        argv,
+        projects[0],
+      ));
+      configs = [{config, globalConfig, hasDeprecationWarnings}];
+      if (globalConfig.projects && globalConfig.projects.length) {
+        projects = globalConfig.projects;
+      }
+    }
+
+    if (projects.length > 1) {
+      configs = await Promise.all(projects.map(root => readConfig(argv, root)));
+      // If no config was passed initially, use the one from the first project
+      if (!globalConfig && !config) {
+        globalConfig = configs[0].globalConfig;
+        config = configs[0].config;
+      }
+    }
+
+    if (!config || !globalConfig || !configs.length) {
+      throw new Error('jest: No configuration found for any project.');
+    }
 
     if (argv.debug || argv.showConfig) {
-      logDebugMessages(configs[0].globalConfig, configs[0].config, pipe);
+      logDebugMessages(globalConfig, config, pipe);
     }
 
     if (argv.showConfig) {
       process.exit(0);
     }
 
-    await _run(configs[0].globalConfig, configs);
+    await _run(globalConfig, configs);
   } catch (error) {
     clearLine(process.stderr);
     clearLine(process.stdout);

packages/jest-config/package.json

@@ -9,6 +9,7 @@
   "main": "build/index.js",
   "dependencies": {
     "chalk": "^1.1.3",
+    "glob": "^7.1.1",
     "jest-environment-jsdom": "^19.0.2",
     "jest-environment-node": "^19.0.2",
     "jest-jasmine2": "^19.0.2",

packages/jest-config/src/__tests__/__snapshots__/normalize-test.js.snap

@@ -27,7 +27,7 @@ exports[`preset throws when preset not found 1`] = `
 </>"
 `;
 
-exports[`rootDir throws if the config is missing a rootDir property 1`] = `
+exports[`rootDir throws if the options is missing a rootDir property 1`] = `
 "<red><bold><bold>● <bold>Validation Error:
 
   Configuration option <bold>rootDir must be specified.