append error to error.message instead of stack

Author: kuceb

__snapshots__/e2e.spec.js

@@ -22,6 +22,7 @@ Oops...we found an error preparing this test file:
 
 The error was:
 
+Error: Webpack Compilation Error
 ./cypress/tests/e2e/compile-error.js
 Module build failed (from ./node_modules/babel-loader/lib/index.js):
 SyntaxError: /[cwd]/cypress/tests/e2e/compile-error.js: Unexpected token, expected "," (12:27)
@@ -35,6 +36,7 @@ SyntaxError: /[cwd]/cypress/tests/e2e/compile-error.js: Unexpected token, expect
 
  @ multi ./cypress/tests/e2e/compile-error.js main[0]
 
+
 This occurred while Cypress was compiling and bundling your test code. This is usually caused by:
 
 - A missing file or dependency

index.js

@@ -108,8 +108,6 @@ const preprocessor = (options = {}) => {
 
     const rejectWithErr = (err) => {
       err.filePath = filePath
-      // backup the original stack before it's potentially modified by bluebird
-      err.originalStack = err.stack
       debug(`errored bundling ${outputPath}`, err)
       latestBundle.reject(err)
     }
@@ -125,7 +123,11 @@ const preprocessor = (options = {}) => {
 
       if (stats.hasErrors()) {
         err = new Error('Webpack Compilation Error')
-        err.stack = jsonStats.errors.join('\n\n')
+        err.message += `\n${jsonStats.errors
+        // remove stack trace lines since they're useless for debugging
+        .map((err) => err.replace(/\n\s*at.*/g, '').replace(/From previous event:\n?/g, ''))
+        // multiple errors separated by newline
+        .join('\n\n')}`
 
         return rejectWithErr(err)
       }