Update tools/copy.js to clean up package.json before copying

Author: whynot123

package.json

@@ -81,7 +81,6 @@
     "react-transform-catch-errors": "^1.0.2",
     "react-transform-hmr": "^1.0.4",
     "redbox-react": "^1.2.2",
-    "replace": "^0.3.0",
     "stylelint": "^5.0.1",
     "stylelint-config-standard": "^4.0.1",
     "url-loader": "^0.5.7",

tools/copy.js

@@ -9,9 +9,9 @@
 
 import path from 'path';
 import gaze from 'gaze';
-import replace from 'replace';
 import Promise from 'bluebird';
-
+import fs from './lib/fs';
+import pkg from '../package.json';
 /**
  * Copies static files such as robots.txt, favicon.ico to the
  * output (build) folder.
@@ -22,16 +22,16 @@ async function copy({ watch } = {}) {
   await Promise.all([
     ncp('src/public', 'build/public'),
     ncp('src/content', 'build/content'),
-    ncp('package.json', 'build/package.json'),
   ]);
 
-  replace({
-    regex: '"start".*',
-    replacement: '"start": "node server.js"',
-    paths: ['build/package.json'],
-    recursive: false,
-    silent: false,
-  });
+  await fs.writeFile('./build/package.json', JSON.stringify({
+    private: true,
+    engines: pkg.engines,
+    dependencies: pkg.dependencies,
+    scripts: {
+      start: 'node server.js',
+    },
+  }, null, 2));
 
   if (watch) {
     const watcher = await new Promise((resolve, reject) => {