feat: replace NODE_ENV 2 enable DCE when minifying

Author: digitalsadhu

lib/reader.js

@@ -12,6 +12,7 @@ const feedSchema = require('./feed-schema');
 const uglify = require('uglify-es');
 const Boom = require('boom');
 const assert = require('assert');
+const envify = require('envify');
 
 /**
  * Unpacks given feeds into directory structure before
@@ -42,7 +43,12 @@ module.exports = async (feeds, options) => {
             });
     });
 
-    const opts = { sourceMaps: false, minify: false, ...options };
+    const opts = {
+        sourceMaps: false,
+        minify: false,
+        env: process.env.NODE_ENV || 'development',
+        ...options,
+    };
 
     if (!opts.directory) {
         opts.directory = directory();
@@ -63,6 +69,11 @@ module.exports = async (feeds, options) => {
 
     const bundler = browserify({ entries, debug: opts.sourceMaps });
 
+    bundler.transform(envify, {
+        _: 'purge',
+        NODE_ENV: opts.env,
+    });
+
     let bundle = await getStream(bundler.bundle());
 
     if (opts.minify) {

package-lock.json

@@ -29,6 +29,7 @@
     "asset-pipe-common": "^1.0.0-beta.6",
     "boom": "^7.1.1",
     "browserify": "^15.2.0",
+    "envify": "^4.1.0",
     "fs-extra": "^5.0.0",
     "joi": "^13.1.1",
     "readable-stream": "^2.3.3",