diff --git a/script/lib/fast-clean-output-directory.js b/script/lib/fast-clean-output-directory.js
new file mode 100644
index 000000000..b1053eba2
--- /dev/null
+++ b/script/lib/fast-clean-output-directory.js
@@ -0,0 +1,19 @@
+const fs = require('fs-extra')
+const path = require('path')
+const CONFIG = require('../config')
+
+module.exports = function () {
+  let srcPaths = [
+    path.join('benchmarks', 'benchmark-runner.js'),
+    path.join('dot-atom'),
+    path.join('exports'),
+    path.join('package.json'),
+    path.join('static'),
+    path.join('src'),
+    path.join('vendor')
+  ]
+
+  for (const srcPath of srcPaths) {
+    fs.removeSync(path.join(CONFIG.intermediateAppPath, srcPath))
+  }
+}
diff --git a/script/lib/fast-copy-assets.js b/script/lib/fast-copy-assets.js
new file mode 100644
index 000000000..1602a7af8
--- /dev/null
+++ b/script/lib/fast-copy-assets.js
@@ -0,0 +1,31 @@
+// This module exports a function that copies all the static assets into the
+// appropriate location in the build output directory.
+
+'use strict'
+
+const path = require('path')
+const fs = require('fs-extra')
+const CONFIG = require('../config')
+const glob = require('glob')
+const includePathInPackagedApp = require('./include-path-in-packaged-app')
+
+module.exports = function () {
+  console.log(`Copying assets to ${CONFIG.intermediateAppPath}`);
+  let srcPaths = [
+    path.join(CONFIG.repositoryRootPath, 'benchmarks', 'benchmark-runner.js'),
+    path.join(CONFIG.repositoryRootPath, 'dot-atom'),
+    path.join(CONFIG.repositoryRootPath, 'exports'),
+    path.join(CONFIG.repositoryRootPath, 'package.json'),
+    path.join(CONFIG.repositoryRootPath, 'static'),
+    path.join(CONFIG.repositoryRootPath, 'src'),
+    path.join(CONFIG.repositoryRootPath, 'vendor')
+  ]
+  for (let srcPath of srcPaths) {
+    fs.copySync(srcPath, computeDestinationPath(srcPath), {filter: includePathInPackagedApp})
+  }
+}
+
+function computeDestinationPath (srcPath) {
+  const relativePath = path.relative(CONFIG.repositoryRootPath, srcPath)
+  return path.join(CONFIG.intermediateAppPath, relativePath)
+}
diff --git a/script/lib/fast-transpile-babel-paths.js b/script/lib/fast-transpile-babel-paths.js
new file mode 100644
index 000000000..a1901e7a0
--- /dev/null
+++ b/script/lib/fast-transpile-babel-paths.js
@@ -0,0 +1,36 @@
+'use strict'
+
+const CompileCache = require('../../src/compile-cache')
+const fs = require('fs')
+const glob = require('glob')
+const path = require('path')
+
+const CONFIG = require('../config')
+const BABEL_OPTIONS = require('../../static/babelrc.json')
+const BABEL_PREFIXES = [
+  "'use babel'",
+  '"use babel"',
+  '/** @babel */',
+  '/* @flow */'
+]
+const PREFIX_LENGTH = Math.max.apply(null, BABEL_PREFIXES.map(prefix => prefix.length))
+const BUFFER = Buffer(PREFIX_LENGTH)
+
+module.exports = function () {
+  console.log(`Transpiling Babel paths in ${CONFIG.intermediateAppPath}`)
+  for (let path of getPathsToTranspile()) {
+    transpileBabelPath(path)
+  }
+}
+
+function getPathsToTranspile () {
+  let paths = []
+  paths = paths.concat(glob.sync(path.join(CONFIG.intermediateAppPath, 'benchmarks', '**', '*.js')))
+  paths = paths.concat(glob.sync(path.join(CONFIG.intermediateAppPath, 'exports', '**', '*.js')))
+  paths = paths.concat(glob.sync(path.join(CONFIG.intermediateAppPath, 'src', '**', '*.js')))
+  return paths
+}
+
+function transpileBabelPath (path) {
+  fs.writeFileSync(path, CompileCache.addPathToCache(path, CONFIG.atomHomeDirPath))
+}
diff --git a/script/lib/fast-transpile-coffee-script-paths.js b/script/lib/fast-transpile-coffee-script-paths.js
new file mode 100644
index 000000000..7e080691f
--- /dev/null
+++ b/script/lib/fast-transpile-coffee-script-paths.js
@@ -0,0 +1,28 @@
+'use strict'
+
+const CompileCache = require('../../src/compile-cache')
+const fs = require('fs')
+const glob = require('glob')
+const path = require('path')
+
+const CONFIG = require('../config')
+
+module.exports = function () {
+  console.log(`Transpiling CoffeeScript paths in ${CONFIG.intermediateAppPath}`)
+  for (let path of getPathsToTranspile()) {
+    transpileCoffeeScriptPath(path)
+  }
+}
+
+function getPathsToTranspile () {
+  let paths = []
+  paths = paths.concat(glob.sync(path.join(CONFIG.intermediateAppPath, 'src', '**', '*.coffee')))
+  paths = paths.concat(glob.sync(path.join(CONFIG.intermediateAppPath, 'spec', '*.coffee')))
+  return paths
+}
+
+function transpileCoffeeScriptPath (coffeePath) {
+  const jsPath = coffeePath.replace(/coffee$/g, 'js')
+  fs.writeFileSync(jsPath, CompileCache.addPathToCache(coffeePath, CONFIG.atomHomeDirPath))
+  fs.unlinkSync(coffeePath)
+}
diff --git a/script/tdd b/script/tdd
new file mode 100755
index 000000000..db78ef3e4
--- /dev/null
+++ b/script/tdd
@@ -0,0 +1,42 @@
+#!/usr/bin/env node
+
+'use strict'
+
+// Needed so we can require src/module-cache.coffee during generateModuleCache
+require('coffee-script/register')
+require('colors')
+
+const yargs = require('yargs')
+const argv = yargs
+  .usage('Usage: $0 [options]')
+  .help('help')
+  .describe('code-sign',  'Code-sign executables (macOS and Windows only)')
+  .describe('create-windows-installer', 'Create installer (Windows only)')
+  .describe('create-debian-package', 'Create .deb package (Linux only)')
+  .describe('create-rpm-package', 'Create .rpm package (Linux only)')
+  .describe('compress-artifacts', 'Compress Atom binaries (and symbols on macOS)')
+  .describe('install', 'Install Atom')
+  .wrap(yargs.terminalWidth())
+  .argv
+
+const cleanOutputDirectory = require('./lib/fast-clean-output-directory')
+const copyAssets = require('./lib/fast-copy-assets')
+const generateMetadata = require('./lib/generate-metadata')
+const generateModuleCache = require('./lib/generate-module-cache')
+const generateStartupSnapshot = require('./lib/generate-startup-snapshot')
+const packageApplication = require('./lib/package-application')
+const transpileBabelPaths = require('./lib/fast-transpile-babel-paths')
+const transpileCoffeeScriptPaths = require('./lib/fast-transpile-coffee-script-paths')
+
+process.on('unhandledRejection', function (e) {
+  console.error(e.stack || e)
+  process.exit(1)
+})
+
+cleanOutputDirectory()
+copyAssets()
+transpileBabelPaths()
+transpileCoffeeScriptPaths()
+generateModuleCache()
+generateMetadata()
+packageApplication().then(generateStartupSnapshot)