--showConfig support jest20 and jest21 (jestjs#4575)

* --showConfig to show all project configs jestjs#4078

* return configs

* new method getConfigs

* new method getConfigs

* call completed

* eslint

* support jest 20

* lint

* version

* getConfig for jest21

* lint

* fix jest20 bug

* fix bug

* lint

* add type ConfigRepresentations

* remove ConfigRepresentations

* update

Author: recca0120

packages/jest-editor-support/src/Settings.js

@@ -32,13 +32,16 @@ type ConfigRepresentation = {
   testMatch: Array<Glob>,
 };
 
+type ConfigRepresentations = Array<ConfigRepresentation>;
+
 export default class Settings extends EventEmitter {
   getConfigProcess: ChildProcess;
   jestVersionMajor: number | null;
   _createProcess: (
     workspace: ProjectWorkspace,
     args: Array<string>,
   ) => ChildProcess;
+  configs: ConfigRepresentations;
   settings: ConfigRepresentation;
   workspace: ProjectWorkspace;
 
@@ -52,6 +55,8 @@ export default class Settings extends EventEmitter {
       testMatch: ['**/__tests__/**/*.js?(x)', '**/?(*.)(spec|test).js?(x)'],
       testRegex: '(/__tests__/.*|\\.(test|spec))\\.jsx?$',
     };
+
+    this.configs = [this.settings];
   }
 
   getConfigs(completed: any) {
@@ -60,13 +65,10 @@ export default class Settings extends EventEmitter {
     ]);
 
     this.getConfigProcess.stdout.on('data', (data: Buffer) => {
-      const {configs, version} = JSON.parse(data.toString());
-      // We can give warnings to versions under 17 now
-      // See https://github.com/facebook/jest/issues/2343 for moving this into
-      // the config object
-
-      this.jestVersionMajor = parseInt(version.split('.').shift(), 10);
-      this.settings = configs;
+      const settings = JSON.parse(data.toString());
+      this.jestVersionMajor = parseInt(settings.version.split('.').shift(), 10);
+      this.configs =
+        this.jestVersionMajor >= 21 ? settings.configs : [settings.config];
     });
 
     // They could have an older build of Jest which
@@ -76,9 +78,9 @@ export default class Settings extends EventEmitter {
     });
   }
 
-  getConfig(completed: any) {
+  getConfig(completed: any, index: number = 0) {
     this.getConfigs(() => {
-      this.settings = this.settings[0];
+      this.settings = this.configs[index];
       completed();
     });
   }

packages/jest-editor-support/src/__tests__/settings.test.js

@@ -26,17 +26,17 @@ describe('Settings', () => {
     expect(settings.settings).toEqual(expect.any(Object));
   });
 
-  it('reads and parses the configs', () => {
+  it('[jest 20] reads and parses the config', () => {
     const workspace = new ProjectWorkspace(
       'root_path',
       'path_to_jest',
       'test',
       1000,
     );
     const completed = jest.fn();
-    const configs = [{cacheDirectory: '/tmp/jest', name: '[md5 hash]'}];
+    const config = {cacheDirectory: '/tmp/jest', name: '[md5 hash]'};
     const json = {
-      configs,
+      config,
       version: '19.0.0',
     };
 
@@ -46,16 +46,16 @@ describe('Settings', () => {
     const buffer = makeBuffer(JSON.stringify(json));
     const settings = new Settings(workspace, {createProcess});
 
-    settings.getConfigs(completed);
+    settings.getConfig(completed);
     settings.getConfigProcess.stdout.emit('data', buffer);
     settings.getConfigProcess.emit('close');
 
     expect(completed).toHaveBeenCalled();
     expect(settings.jestVersionMajor).toBe(19);
-    expect(settings.settings).toEqual(configs);
+    expect(settings.settings).toEqual(config);
   });
 
-  it('reads and parses the config', () => {
+  it('[jest 21] reads and parses the config', () => {
     const workspace = new ProjectWorkspace(
       'root_path',
       'path_to_jest',
@@ -66,7 +66,7 @@ describe('Settings', () => {
     const configs = [{cacheDirectory: '/tmp/jest', name: '[md5 hash]'}];
     const json = {
       configs,
-      version: '19.0.0',
+      version: '21.0.0',
     };
 
     const mockProcess: any = new EventEmitter();
@@ -80,10 +80,39 @@ describe('Settings', () => {
     settings.getConfigProcess.emit('close');
 
     expect(completed).toHaveBeenCalled();
-    expect(settings.jestVersionMajor).toBe(19);
+    expect(settings.jestVersionMajor).toBe(21);
     expect(settings.settings).toEqual(configs[0]);
   });
 
+  it('[jest 21] reads and parses the configs', () => {
+    const workspace = new ProjectWorkspace(
+      'root_path',
+      'path_to_jest',
+      'test',
+      1000,
+    );
+    const completed = jest.fn();
+    const configs = [{cacheDirectory: '/tmp/jest', name: '[md5 hash]'}];
+    const json = {
+      configs,
+      version: '21.0.0',
+    };
+
+    const mockProcess: any = new EventEmitter();
+    mockProcess.stdout = new EventEmitter();
+    const createProcess = () => mockProcess;
+    const buffer = makeBuffer(JSON.stringify(json));
+    const settings = new Settings(workspace, {createProcess});
+
+    settings.getConfigs(completed);
+    settings.getConfigProcess.stdout.emit('data', buffer);
+    settings.getConfigProcess.emit('close');
+
+    expect(completed).toHaveBeenCalled();
+    expect(settings.jestVersionMajor).toBe(21);
+    expect(settings.configs).toEqual(configs);
+  });
+
   it('calls callback even if no data is sent', () => {
     const workspace = new ProjectWorkspace(
       'root_path',