diff --git a/client/.gitignore b/client/.gitignore
index e4047a2e1b..cc6a71fd16 100644
--- a/client/.gitignore
+++ b/client/.gitignore
@@ -4,6 +4,9 @@ node_modules
 yarn-error.log
 
 config/env.json
+config/frame-runner.json
+config/sass-compile.json
+config/test-evaluator.json
 
 # Build directory
 /public
diff --git a/client/src/templates/Challenges/rechallenge/transformers.js b/client/src/templates/Challenges/rechallenge/transformers.js
index de38e7934c..1618c8ba4f 100644
--- a/client/src/templates/Challenges/rechallenge/transformers.js
+++ b/client/src/templates/Challenges/rechallenge/transformers.js
@@ -18,6 +18,10 @@ import protect from 'loop-protect';
 import * as vinyl from '../utils/polyvinyl.js';
 import createWorker from '../utils/worker-executor';
 
+// the config files are created during the build, but not before linting
+// eslint-disable-next-line import/no-unresolved
+import { filename as sassCompile } from '../../../../config/sass-compile';
+
 const protectTimeout = 100;
 Babel.registerPlugin('loopProtection', protect(protectTimeout));
 
@@ -89,7 +93,7 @@ export const babelTransformer = cond([
   [stubTrue, identity]
 ]);
 
-const sassWorker = createWorker('sass-compile');
+const sassWorker = createWorker(sassCompile);
 async function transformSASS(element) {
   const styleTags = element.querySelectorAll('style[type="text/sass"]');
   await Promise.all(
diff --git a/client/src/templates/Challenges/utils/build.js b/client/src/templates/Challenges/utils/build.js
index 46aafdbf37..a33f03823e 100644
--- a/client/src/templates/Challenges/utils/build.js
+++ b/client/src/templates/Challenges/utils/build.js
@@ -8,9 +8,15 @@ import {
   createMainFramer
 } from './frame';
 
+// the config files are created during the build, but not before linting
+// eslint-disable-next-line import/no-unresolved
+import { filename as runner } from '../../../../config/frame-runner';
+// eslint-disable-next-line import/no-unresolved
+import { filename as testEvaluator } from '../../../../config/test-evaluator';
+
 const frameRunner = [
   {
-    src: '/js/frame-runner.js'
+    src: `/js/${runner}.js`
   }
 ];
 
@@ -91,7 +97,7 @@ export function getTestRunner(buildData, proxyLogger, document) {
 function getJSTestRunner({ build, sources }, proxyLogger) {
   const code = sources && 'index' in sources ? sources['index'] : '';
 
-  const testWorker = createWorker('test-evaluator', { terminateWorker: true });
+  const testWorker = createWorker(testEvaluator, { terminateWorker: true });
 
   return (testString, testTimeout) => {
     return testWorker
diff --git a/client/webpack-workers.js b/client/webpack-workers.js
index 442e244779..9822de100d 100644
--- a/client/webpack-workers.js
+++ b/client/webpack-workers.js
@@ -1,8 +1,11 @@
 const path = require('path');
 const CopyWebpackPlugin = require('copy-webpack-plugin');
+const { writeFileSync } = require('fs');
 
 module.exports = (env = {}) => {
   const __DEV__ = env.production !== true;
+  const staticPath = path.join(__dirname, './static/js');
+  const configPath = path.join(__dirname, './config');
   return {
     mode: __DEV__ ? 'development' : 'production',
     entry: {
@@ -13,8 +16,18 @@ module.exports = (env = {}) => {
     devtool: __DEV__ ? 'inline-source-map' : 'source-map',
     output: {
       publicPath: '/js/',
-      chunkFilename: '[name].js',
-      path: path.join(__dirname, './static/js')
+      filename: chunkData => {
+        // construct and output the filename here, so the client can use the
+        // json to find the file.
+        const filename = `${chunkData.chunk.name}.${chunkData.chunk.contentHash.javascript}`;
+        writeFileSync(
+          path.join(configPath, `${chunkData.chunk.name}.json`),
+          `{"filename": "${filename}"}`
+        );
+        return filename + '.js';
+      },
+      chunkFilename: '[name].[contenthash].js',
+      path: staticPath
     },
     stats: {
       // Display bailout reasons
diff --git a/curriculum/test/test-challenges.js b/curriculum/test/test-challenges.js
index 8b8c1aa19b..888255f812 100644
--- a/curriculum/test/test-challenges.js
+++ b/curriculum/test/test-challenges.js
@@ -49,6 +49,8 @@ const {
   createPoly
 } = require('../../client/src/templates/Challenges/utils/polyvinyl');
 
+const testEvaluator = require('../../client/config/test-evaluator').filename;
+
 const oldRunnerFail = Mocha.Runner.prototype.fail;
 Mocha.Runner.prototype.fail = function(test, err) {
   if (err instanceof AssertionError) {
@@ -327,7 +329,7 @@ async function createTestRunnerForJSChallenge({ files }, solution) {
   const { build, sources } = await buildJSChallenge({ files });
   const code = sources && 'index' in sources ? sources['index'] : '';
 
-  const testWorker = createWorker('test-evaluator', { terminateWorker: true });
+  const testWorker = createWorker(testEvaluator, { terminateWorker: true });
   return async ({ text, testString }) => {
     try {
       const { pass, err } = await testWorker.execute(