Add production dependencies & build

node_modules/@octokit/graphql/lib/error.js

@@ -0,0 +1,16 @@
+module.exports = class GraphqlError extends Error {
+  constructor (request, response) {
+    const message = response.data.errors[0].message
+    super(message)
+
+    Object.assign(this, response.data)
+    this.name = 'GraphqlError'
+    this.request = request
+
+    // Maintains proper stack trace (only available on V8)
+    /* istanbul ignore next */
+    if (Error.captureStackTrace) {
+      Error.captureStackTrace(this, this.constructor)
+    }
+  }
+}