Express addition

node_modules/acorn/rollup/config.bin.js

@@ -0,0 +1,15 @@
+import buble from 'rollup-plugin-buble'
+
+export default {
+  entry: 'src/bin/acorn.js',
+  dest: 'bin/acorn',
+  format: 'cjs',
+  banner: '#!/usr/bin/env node',
+  external: [ 'fs', 'path', 'acorn' ],
+  paths: {
+    acorn: '../dist/acorn.js'
+  },
+  plugins: [
+    buble()
+  ]
+}