Instead of making this part of the build process, let the devs generate stripped-emoji.json

With the expectation that when the file needs to be regenerated to include other keys, the developer will run this script.

package.json

@@ -33,9 +33,8 @@
   "scripts": {
     "reskindex": "node scripts/reskindex.js -h header",
     "reskindex:watch": "node scripts/reskindex.js -h header -w",
-    "build:init": "mkdir -p lib && npm run emoji-data-strip",
-    "build": "npm run build:init && npm run reskindex && babel src -d lib --source-maps",
-    "build:watch": "npm run build:init && babel src -w -d lib --source-maps",
+    "build": "npm run reskindex && babel src -d lib --source-maps --copy-files",
+    "build:watch": "babel src -w -d lib --source-maps --copy-files",
     "emoji-data-strip": "node scripts/emoji-data-strip.js",
     "start": "parallelshell \"npm run build:watch\" \"npm run reskindex:watch\"",
     "lint": "eslint src/",

scripts/emoji-data-strip.js

@@ -11,7 +11,8 @@ const output = Object.keys(EMOJI_DATA).map(
             category: datum.category,
             emoji_order: datum.emoji_order,
         };
-    }
+    },
 );
 
-fs.writeFileSync('./lib/stripped-emoji.json', JSON.stringify(output));
+// Write to a file in src. Changes should be checked in to git
+fs.writeFileSync('./src/stripped-emoji.json', JSON.stringify(output));