refactor(jest-runner): remove unnecessary ProcessTerminatedError logic (#12287)

Author: mrazauskas

packages/jest-runner/package.json

@@ -25,7 +25,6 @@
     "@types/node": "*",
     "chalk": "^4.0.0",
     "emittery": "^0.8.1",
-    "exit": "^0.1.2",
     "graceful-fs": "^4.2.9",
     "jest-docblock": "^27.4.0",
     "jest-environment-jsdom": "^27.4.6",

packages/jest-runner/src/index.ts

@@ -7,10 +7,8 @@
 
 import chalk = require('chalk');
 import Emittery = require('emittery');
-import exit = require('exit');
 import throat from 'throat';
 import type {
-  SerializableError,
   Test,
   TestEvents,
   TestFileEvent,
@@ -97,11 +95,10 @@ export default class TestRunner {
               if (watcher.isInterrupted()) {
                 throw new CancelRun();
               }
-              let sendMessageToJest: TestFileEvent;
-
               // Remove `if(onStart)` in Jest 27
               if (onStart) {
                 await onStart(test);
+
                 return runTest(
                   test.path,
                   this._globalConfig,
@@ -110,41 +107,42 @@ export default class TestRunner {
                   this._context,
                   undefined,
                 );
-              } else {
-                // `deepCyclicCopy` used here to avoid mem-leak
-                sendMessageToJest = (eventName, args) =>
-                  this.eventEmitter.emit(
-                    eventName,
-                    deepCyclicCopy(args, {keepPrototype: false}),
-                  );
-
-                await this.eventEmitter.emit('test-file-start', [test]);
-                return runTest(
-                  test.path,
-                  this._globalConfig,
-                  test.context.config,
-                  test.context.resolver,
-                  this._context,
-                  sendMessageToJest,
-                );
               }
+
+              // `deepCyclicCopy` used here to avoid mem-leak
+              const sendMessageToJest: TestFileEvent = (eventName, args) =>
+                this.eventEmitter.emit(
+                  eventName,
+                  deepCyclicCopy(args, {keepPrototype: false}),
+                );
+
+              await this.eventEmitter.emit('test-file-start', [test]);
+
+              return runTest(
+                test.path,
+                this._globalConfig,
+                test.context.config,
+                test.context.resolver,
+                this._context,
+                sendMessageToJest,
+              );
             })
             .then(result => {
               if (onResult) {
                 return onResult(test, result);
-              } else {
-                return this.eventEmitter.emit('test-file-success', [
-                  test,
-                  result,
-                ]);
               }
+
+              return this.eventEmitter.emit('test-file-success', [
+                test,
+                result,
+              ]);
             })
             .catch(err => {
               if (onFailure) {
                 return onFailure(test, err);
-              } else {
-                return this.eventEmitter.emit('test-file-failure', [test, err]);
               }
+
+              return this.eventEmitter.emit('test-file-failure', [test, err]);
             }),
         ),
       Promise.resolve(),
@@ -225,22 +223,6 @@ export default class TestRunner {
         return promise;
       });
 
-    const onError = async (err: SerializableError, test: Test) => {
-      // Remove `if(onFailure)` in Jest 27
-      if (onFailure) {
-        await onFailure(test, err);
-      } else {
-        await this.eventEmitter.emit('test-file-failure', [test, err]);
-      }
-      if (err.type === 'ProcessTerminatedError') {
-        console.error(
-          'A worker process has quit unexpectedly! ' +
-            'Most likely this is an initialization error.',
-        );
-        exit(1);
-      }
-    };
-
     const onInterrupt = new Promise((_, reject) => {
       watcher.on('change', state => {
         if (state.interrupted) {
@@ -255,14 +237,17 @@ export default class TestRunner {
           .then(result => {
             if (onResult) {
               return onResult(test, result);
-            } else {
-              return this.eventEmitter.emit('test-file-success', [
-                test,
-                result,
-              ]);
             }
+
+            return this.eventEmitter.emit('test-file-success', [test, result]);
           })
-          .catch(error => onError(error, test)),
+          .catch(error => {
+            if (onFailure) {
+              return onFailure(test, error);
+            }
+
+            return this.eventEmitter.emit('test-file-failure', [test, error]);
+          }),
       ),
     );
 
@@ -279,6 +264,7 @@ export default class TestRunner {
         );
       }
     };
+
     return Promise.race([runAllTests, onInterrupt]).then(cleanup, cleanup);
   }
 

yarn.lock

@@ -13064,7 +13064,6 @@ __metadata:
     "@types/source-map-support": ^0.5.0
     chalk: ^4.0.0
     emittery: ^0.8.1
-    exit: ^0.1.2
     graceful-fs: ^4.2.9
     jest-docblock: ^27.4.0
     jest-environment-jsdom: ^27.4.6