Clean output directory before building

build/build.js

@@ -2,8 +2,10 @@
 
 'use strict'
 
+const cleanOutputDirectory = require('./lib/clean-output-directory')
 const transpileBabelPaths = require('./lib/transpile-babel-paths')
 const transpileCoffeeScriptPaths = require('./lib/transpile-coffee-script-paths')
 
+cleanOutputDirectory()
 transpileBabelPaths()
 transpileCoffeeScriptPaths()

build/lib/clean-output-directory.js

@@ -0,0 +1,10 @@
+const fs = require('fs-extra')
+const path = require('path')
+const CONFIG = require('../config')
+
+module.exports = function () {
+  if (fs.existsSync(CONFIG.buildOutputPath)) {
+    console.log(`Cleaning ${CONFIG.buildOutputPath}...`);
+    fs.removeSync(CONFIG.buildOutputPath)
+  }
+}

build/package.json

@@ -2,7 +2,8 @@
   "name": "atom-build-scripts",
   "description": "Atom build scripts",
   "dependencies": {
-    "glob": "^7.0.3",
-    "mkdirp": "^0.5.1"
+    "fs-extra": "0.30.0",
+    "glob": "7.0.3",
+    "mkdirp": "0.5.1"
   }
 }