Custom reporter integration

.vscode/settings.json

@@ -2,5 +2,7 @@
   "jest.pathToJest": "npm run jest --",
   "editor.rulers": [
     80
-  ]
+],
+"eslint.enable": true,
+"javascript.validate.enable": false
 }

packages/jest-cli/src/TestRunner.js

@@ -379,6 +379,10 @@ class TestRunner {
   _setupReporters() {
     const config = this._config;
 
+    if (config.reporters) {
+      return this._addCustomReporters(config.reporters);
+    }
+
     this.addReporter(
       config.verbose
         ? new VerboseReporter(config)
@@ -396,6 +400,57 @@ class TestRunner {
     if (config.notify) {
       this.addReporter(new NotifyReporter(this._startRun));
     }
+
+    return undefined;
+  }
+
+  /**
+   * Add Custom reporters to Jest
+   * Custom reporters can be added to Jest using the reporters option in Jest
+   * Config. The format for adding a custom reporter is following:
+   *
+   * Format for the custom reporters
+   *
+   * "reporters": [
+   *    ["reporterPath/packageName", { option1: 'fasklj' }], 
+   *    // Format if we want to specify options
+   *    
+   *    "reporterName"
+   *    // Format if we don't want to specify any options
+   * ]
+   */
+  _addCustomReporters(reporters: any) {
+    let reporterPath, reporterConfig;
+
+    reporters.forEach(entry => {
+      if (Array.isArray(entry)) {
+        [reporterPath, reporterConfig] = entry;
+      } else {
+        if (typeof entry !== 'string') {
+          throw new Error(`
+            Unexpected custom reporter configuration.
+            Expected to get either a path string or an array of [path, confg]
+            got: ${JSON.stringify(entry)}
+          `);
+        }
+
+        reporterPath = entry;
+      }
+
+      try {
+        const reporter = require(reporterPath);
+        this.addReporter(new reporter(reporterConfig || {}));
+      } catch (error) {
+        console.error(`
+          Failed to set up reporter:
+            ${JSON.stringify(reporterPath)}
+          Config:
+            ${JSON.stringify(reporterConfig)}
+        `);
+
+        throw error;
+      }
+    });
   }
 
   _bailIfNeeded(aggregatedResults: AggregatedResult, watcher: TestWatcher) {

packages/jest-config/src/normalize.js

@@ -354,6 +354,9 @@ function normalize(config: InitialConfig, argv: Object = {}) {
       case 'persistModuleRegistryBetweenSpecs':
       case 'preset':
       case 'replname':
+      case 'reporters':
+        value = _replaceRootDirTags(config.rootDir, config[key]);
+        break;
       case 'resetMocks':
       case 'resetModules':
       case 'rootDir':

packages/jest-config/src/validConfig.js

@@ -57,6 +57,9 @@ module.exports = ({
   noStackTrace: false,
   notify: false,
   preset: 'react-native',
+  reporters: [
+    ['./here-it-goes.js', {option1: true}]
+  ],
   resetMocks: false,
   resetModules: false,
   rootDir: '/',

types/Config.js

@@ -87,6 +87,7 @@ export type Config = {|
   noStackTrace: boolean,
   notify: boolean,
   preset: ?string,
+  reporters: Array<string | Array<string | Object>>,
   resetMocks: boolean,
   resetModules: boolean,
   rootDir: Path,
@@ -132,6 +133,7 @@ export type InitialConfig = {|
   forceExit?: boolean,
   globals?: ConfigGlobals,
   haste?: HasteConfig,
+  reporters?: Array<string | Array<string | Object>>,
   logHeapUsage?: boolean,
   logTransformErrors?: ?boolean,
   moduleDirectories?: Array<string>,