feat(gatsby): add util.promisify polyfill for older node version (#13024)

Author: Moocar

packages/gatsby/package.json

@@ -124,6 +124,7 @@
     "true-case-path": "^1.0.3",
     "type-of": "^2.0.1",
     "url-loader": "^1.0.1",
+    "util.promisify": "^1.0.0",
     "uuid": "^3.1.0",
     "v8-compile-cache": "^1.1.0",
     "webpack": "~4.28.4",

packages/gatsby/src/bootstrap/index.js

@@ -24,6 +24,8 @@ const preferDefault = require(`./prefer-default`)
 const nodeTracking = require(`../db/node-tracking`)
 const withResolverContext = require(`../schema/context`)
 require(`../db`).startAutosave()
+// Add `util.promisify` polyfill for old node versions
+require(`util.promisify/shim`)()
 
 // Show stack trace on unhandled promises.
 process.on(`unhandledRejection`, (reason, p) => {