FCM subscription fails with Polymer build js: minify=true

[ackushiw]

Description

When using polymerfire's <firebase-messaging> in a production bundle with minified JavaScript FCM registration fails.

Expected outcome

Registration token for using FCM

Actual outcome

Error in console

code: "messaging/token-subscribe-failed"
message: "Request contains an invalid argument."

Steps to reproduce

follow setup guide for polymerfire messaging
With polymer.json configured

{
    "name": "unbundled",
    "addServiceWorker": true,
    "swPrecacheConfig": "sw-precache-config.js",
    "js": {"minify": true},
    "css": {"minify": true},
    "html": {"minify": true}
  }

in terminal polymer serve build/unbundled

in browser enable notifications and check console for errors

Temporary Solution

in polymer.json
set "js": {"minify": false}

Browsers Affected

• Chrome
• Android Chrome
• Opera
• Firefox
• Safari 9
• Safari 8
• Safari 7
• Edge
• IE 11
• IE 10

[khammami]

https://github.com/Polymer/polymer-cli/issues/701