fix metadata

package.json

@@ -8,6 +8,7 @@
   "scripts": {
     "build": "npm run clean && npm run build:tsc && npm run build:dist",
     "build:tsc": "tsc --sourceMap",
+    "build:metadata": "./scripts/get-metadata.js > src/metadata.json",
     "build:dist": "cross-env NODE_ENV=production webpack",
     "clean": "rm -rf ./dist/ ./doc/ ./.nyc_output",
     "lint": "eslint --ignore-path .gitignore --ext .ts,.tsx .",

scripts/get-metadata.js

@@ -0,0 +1,19 @@
+#!/usr/bin/env node
+'use strict'
+
+const packageInfo = require('../package.json')
+
+const execSync = require('child_process').execSync
+
+process.stdout.write(
+    JSON.stringify(
+        {
+            version: require('../package.json').version,
+            commit: execSync(`git rev-parse HEAD`)
+                .toString()
+                .trim()
+        },
+        null,
+        '  '
+    )
+)