1195664 - Error in Service worker, but Warning in client JS: "mutating the [[Prototype]] of an object will cause your code to run very slowly;"

Status: RESOLVED DUPLICATE of bug 1187470

(Core :: DOM: Service Workers, defect)

Description

[arjungadhia]

Attachment: Screen Shot 2015-08-18 at 09.47.36.png

User Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_10_1) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/45.0.2454.15 Safari/537.36

Steps to reproduce:

Simplified test case set up here: https://adgad.github.io/service-worker-mutation-error/
In actual production code setting the __proto__ comes from babel, so not trivial to replace.

1) Visit https://adgad.github.io/service-worker-mutation-error/ in Firefox Developer edition (v42)



Actual results:

Same code gives a warning in the client side code, but an error in the service worker code.

mutating the [[Prototype]] of an object will cause your code to run very slowly; instead create the object with the correct initial [[Prototype]] value using Object.create client.js:11:1

Error: : mutating the [[Prototype]] of an object will cause your code to run very slowly; instead create the object with the correct initial [[Prototype]] value using Object.create


Expected results:

Expected a warning in both, and the worker code to continue executing.

Comment 1

[Ben Kelly [:bkelly, not reviewing]]

Please try nightly 43.  I believe this has been fixed in bug 1187470.