feat: Add GitHub Action reporter

packages/jest-reporters/src/GitHubActionsReporter.ts

@@ -0,0 +1,70 @@
+/**
+ * Copyright (c) Facebook, Inc. and its affiliates. 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.
+ */
+
+import type {Config} from '@jest/types';
+import type {AggregatedResult} from '@jest/test-result';
+import type {Context, CoverageReporterOptions} from './types';
+import BaseReporter from './BaseReporter';
+
+const NEW_LINE = '%0A';
+const REGEXP_LINE_COL = /:([0-9]+):([0-9]+)/;
+
+export default class GitHubActionsReporter extends BaseReporter {
+  private _globalConfig: Config.GlobalConfig;
+  private _options: CoverageReporterOptions;
+
+  constructor(
+    globalConfig: Config.GlobalConfig,
+    options?: CoverageReporterOptions,
+  ) {
+    super();
+    this._globalConfig = globalConfig;
+    this._options = options || {};
+  }
+
+  async onRunComplete(
+    contexts: Set<Context>,
+    aggregatedResults: AggregatedResult,
+  ): Promise<void> {
+    this._printMessages(aggregatedResults, this._globalConfig);
+  }
+
+  private _printMessages(
+    aggregatedResults: AggregatedResult,
+    globalConfig: Config.GlobalConfig,
+  ) {
+    const failedTests = aggregatedResults.numFailedTests;
+    const runtimeErrors = aggregatedResults.numRuntimeErrorTestSuites;
+
+    if (failedTests + runtimeErrors > 0) {
+      aggregatedResults.testResults.forEach(testResultItem => {
+        const testFilePath = testResultItem.testFilePath;
+
+        testResultItem.testResults.forEach(result => {
+          if (result.status !== 'failed') {
+            return;
+          }
+
+          result.failureMessages.forEach(failureMessage => {
+            const message = failureMessage.replace(/\n/g, NEW_LINE);
+            const captureGroup = message.match(REGEXP_LINE_COL);
+
+            if (!captureGroup) {
+              this.log('Unable to extract line number from call stack');
+              return;
+            }
+
+            const [, line, col] = captureGroup;
+            this.log(
+              `::error file=${testFilePath},line=${line},col=${col}::${message}`,
+            );
+          });
+        });
+      });
+    }
+  }
+}

packages/jest-reporters/src/index.ts

@@ -21,6 +21,7 @@ export type {
 export {default as BaseReporter} from './BaseReporter';
 export {default as CoverageReporter} from './CoverageReporter';
 export {default as DefaultReporter} from './DefaultReporter';
+export {default as GitHubActionsReporter} from './GitHubActionsReporter';
 export {default as NotifyReporter} from './NotifyReporter';
 export {default as SummaryReporter} from './SummaryReporter';
 export {default as VerboseReporter} from './VerboseReporter';