more defaul json serialization

Author: SimenB

packages/jest-haste-map/src/index.ts

@@ -747,6 +747,8 @@ export default class HasteMap extends EventEmitter {
         // @ts-expect-error: assignment of a worker with custom properties.
         this._worker = new Worker(require.resolve('./worker'), {
           exposedMethods: ['getSha1', 'worker'],
+          // @ts-expect-error: option does not exist on the node 12 types
+          forkOptions: {serialization: 'json'},
           maxRetries: 3,
           numWorkers: this._options.maxWorkers,
         }) as WorkerInterface;

packages/jest-reporters/src/CoverageReporter.ts

@@ -144,6 +144,8 @@ export default class CoverageReporter extends BaseReporter {
     } else {
       worker = new Worker(require.resolve('./CoverageWorker'), {
         exposedMethods: ['worker'],
+        // @ts-expect-error: option does not exist on the node 12 types
+        forkOptions: {serialization: 'json'},
         maxRetries: 2,
         numWorkers: this._globalConfig.maxWorkers,
       });