fix(errors): better error msg reporting from worker threads

Author: danbucholtz

src/util/helpers.ts

@@ -389,6 +389,15 @@ export function buildErrorToJson(buildError: BuildError) {
   };
 }
 
+export function jsonToBuildError(nonTypedBuildError: any) {
+  const error = new BuildError(new Error(nonTypedBuildError.message));
+  error.name = nonTypedBuildError.name;
+  error.stack = nonTypedBuildError.stack;
+  error.hasBeenLogged = nonTypedBuildError.hasBeenLogged;
+  error.isFatal = nonTypedBuildError.isFatal;
+  return error;
+}
+
 export function upperCaseFirst(input: string) {
   if (input.length > 1) {
     return input.charAt(0).toUpperCase() + input.substr(1);

src/worker-client.ts

@@ -1,5 +1,6 @@
 import { BuildContext, WorkerProcess, WorkerMessage } from './util/interfaces';
 import { BuildError } from './util/errors';
+import { jsonToBuildError } from './util/helpers';
 import { Logger } from './logger/logger';
 import { fork, ChildProcess } from 'child_process';
 import { join } from 'path';
@@ -37,7 +38,8 @@ export function runWorker(taskModule: string, taskWorker: string, context: Build
         reject(new BuildError(msg.error));
 
       } else if (msg.reject) {
-        reject(new BuildError(msg.reject));
+        const buildError = jsonToBuildError(msg.reject);
+        reject(buildError);
 
       } else {
         resolve(msg.resolve);