diff --git a/build/build.js b/build/build.js
index 49103e63d..5d90029a9 100644
--- a/build/build.js
+++ b/build/build.js
@@ -3,9 +3,11 @@
 'use strict'
 
 const transpileBabelPaths = require('./lib/transpile-babel-paths')
+const transpileCoffeeScriptPaths = require('./lib/transpile-coffee-script-paths')
 
 function transpile () {
-  transpileBabelPaths()
+  // transpileBabelPaths()
+  transpileCoffeeScriptPaths()
 }
 
 transpile()
diff --git a/build/lib/compute-destination-path.js b/build/lib/compute-destination-path.js
new file mode 100644
index 000000000..d79b01198
--- /dev/null
+++ b/build/lib/compute-destination-path.js
@@ -0,0 +1,13 @@
+// Takes an absolute path, relativizes it based on the repository root, then
+// makes it absolute again in the output app path.
+
+'use strict'
+
+const path = require('path')
+const CONFIG = require('../config')
+
+module.exports =
+function computeDestinationPath (srcPath) {
+  let relativePath = path.relative(CONFIG.repositoryRootPath, srcPath)
+  return path.join(CONFIG.electronAppPath, relativePath)
+}
diff --git a/build/lib/transpile-babel-paths.js b/build/lib/transpile-babel-paths.js
index 06e4c5c45..c38baf41d 100644
--- a/build/lib/transpile-babel-paths.js
+++ b/build/lib/transpile-babel-paths.js
@@ -10,7 +10,9 @@ const fs = require('fs')
 const glob = require('glob')
 const mkdirp = require('mkdirp')
 const path = require('path')
+const computeDestinationPath = require('./compute-destination-path')
 
+const CONFIG = require('../config')
 const BABEL_OPTIONS = require('../../static/babelrc.json')
 const BABEL_PREFIXES = [
   "'use babel'",
@@ -21,14 +23,10 @@ const BABEL_PREFIXES = [
 const PREFIX_LENGTH = Math.max.apply(null, BABEL_PREFIXES.map(prefix => prefix.length))
 const BUFFER = Buffer(PREFIX_LENGTH)
 
-const CONFIG = require('../config')
-
 function transpileBabelPaths () {
-  for (let srcPath of glob.sync(`${__dirname}/../../src/**/*.js`)) {
+  for (let srcPath of glob.sync(`${CONFIG.repositoryRootPath}/src/**/*.js`)) {
     if (usesBabel(srcPath)) {
-      const relPath = path.relative(CONFIG.repositoryRootPath, srcPath)
-      const destPath = path.join(CONFIG.electronAppPath, relPath)
-      transpileBabelPath(srcPath, destPath)
+      transpileBabelPath(srcPath, computeDestinationPath(srcPath))
     }
   }
 }
diff --git a/build/lib/transpile-coffee-script-paths.js b/build/lib/transpile-coffee-script-paths.js
new file mode 100644
index 000000000..886234ef6
--- /dev/null
+++ b/build/lib/transpile-coffee-script-paths.js
@@ -0,0 +1,36 @@
+// This module exports a function that transpiles all .coffee files into the
+// appropriate location in the build output directory.
+
+'use strict'
+
+const glob = require('glob')
+const path = require('path')
+
+const CONFIG = require('../config')
+const computeDestinationPath = require('./compute-destination-path')
+
+const GLOBS = [
+  'src/**/*.coffee,spec/*.coffee',
+  '!spec/*-spec.coffee',
+  'exports/**/*.coffee',
+  'static/**/*.coffee'
+]
+
+module.exports =
+function transpileCoffeeScriptPaths () {
+  for (let srcPath of getPathsToTranspile()) {
+    transpileCoffeeScriptPath(srcPath, computeDestinationPath(srcPath))
+  }
+}
+
+function getPathsToTranspile () {
+  let paths = []
+  paths = paths.concat(glob.sync(`${CONFIG.repositoryRootPath}/src/**/*.coffee`))
+  paths = paths.concat(glob.sync(`${CONFIG.repositoryRootPath}/spec/*.coffee`, {ignore: '**/*-spec.coffee'}))
+  paths = paths.concat(glob.sync(`${CONFIG.repositoryRootPath}/exports/**/*.coffee`))
+  return paths
+}
+
+function transpileCoffeeScriptPath (srcPath, destPath) {
+  console.log(srcPath);
+}