Use rollup for bundling to speed up startup time

.babelrc

@@ -1,7 +1,8 @@
 {
   "presets": [
     ["es2015", {
-      "loose": true
+      "loose": true,
+      "modules": false
     }],
     "stage-0"
   ],

.travis.yml

@@ -7,7 +7,16 @@ node_js:
   - "5"
   - "6"
 
-before_script: 'if [ -n "${BABEL-}" ]; then make bootstrap-babel ; fi'
+before_install:
+    # Rollup doesn't support node < 4.x. Switch to latest for build
+  - . $HOME/.nvm/nvm.sh
+  - nvm install stable && nvm use stable
+
+before_script:
+  - 'if [ -n "${BABEL-}" ]; then make bootstrap-babel ; fi'
+  - 'npm run build'
+    # Switch back to node version currently being tested prior to test run
+  - 'nvm use $TRAVIS_NODE_VERSION;'
 
 script:
   - 'if [ -n "${LINT-}" ]; then npm run lint ; fi'

package.json

@@ -29,22 +29,24 @@
     "flow-bin": "^0.33.0",
     "lodash": "^4.15.0",
     "nyc": "^8.1.0",
+    "rollup": "^0.36.3",
+    "rollup-plugin-babel": "^2.6.1",
+    "rollup-plugin-node-resolve": "^2.0.0",
     "unicode-9.0.0": "~0.7.0"
   },
   "bin": {
     "babylon": "./bin/babylon.js"
   },
   "scripts": {
-    "build": "babel src --out-dir lib",
+    "build": "rollup -c",
     "coverage": "nyc report --reporter=json && codecov -f coverage/coverage-final.json",
     "lint": "eslint src bin",
     "flow": "flow",
     "prepublish": "cross-env BABEL_ENV=production npm run build",
     "preversion": "npm run test && npm run changelog",
     "test": "npm run lint && npm run flow && npm run build && npm run test-only",
     "test-only": "ava test",
-    "test-ci": "cross-env BABEL_ENV=test npm run build && nyc npm run test-only",
-    "watch": "babel src --out-dir lib --watch",
+    "test-ci": "cross-env BABEL_ENV=test nyc npm run test-only",
     "changelog": "git log `git describe --tags --abbrev=0`..HEAD --pretty=format:' * %s (%an)' | grep -v 'Merge pull request'"
   },
   "nyc": {

rollup.config.js

@@ -0,0 +1,9 @@
+import babel from "rollup-plugin-babel";
+import nodeResolve from "rollup-plugin-node-resolve";
+
+export default {
+  entry: "src/index.js",
+  dest: "lib/index.js",
+  plugins: [babel(), nodeResolve()],
+  format: "cjs"
+};

src/parser/index.js

@@ -30,20 +30,20 @@ export default class Parser extends Tokenizer {
     this[name] = f(this[name]);
   }
 
-  loadPlugins(plugins: Array<string>): Object {
+  loadPlugins(pluginList: Array<string>): Object {
     let pluginMap = {};
 
-    if (plugins.indexOf("flow") >= 0) {
+    if (pluginList.indexOf("flow") >= 0) {
       // ensure flow plugin loads last
-      plugins = plugins.filter((plugin) => plugin !== "flow");
-      plugins.push("flow");
+      pluginList = pluginList.filter((plugin) => plugin !== "flow");
+      pluginList.push("flow");
     }
 
-    for (let name of plugins) {
+    for (let name of pluginList) {
       if (!pluginMap[name]) {
         pluginMap[name] = true;
 
-        let plugin = exports.plugins[name];
+        let plugin = plugins[name];
         if (plugin) plugin(this);
       }
     }