Object Prototypes Incorrect

[johnhenry]

I'm running into an issue where I believe default prototype for objects is incorrect.
That is, Object.getPrototypeOf({}) is not Object.prototype.

Based on the spec, I'm not entirely sure that this should be the case;
but running this code:

Object.getPrototypeOf({}) === Object.prototype;

returns:

• true in the browser and on cloudflareworkers.com
• false when running wrangler pages dev

[mrbbot]

Hey! 👋 This is an issue with how Miniflare (the local Workers simulator that powers wrangler pages dev) works that we probably can't fix without breaking other things. See cloudflare/miniflare#109 (comment) for an explanation of the problem.

As mentioned there, we could add an option that lets you choose which behaviour you want:

• proxy: Miniflare's current behaviour, instanceof always succeeds, but prototype checks don't
• inside: we do nothing, objects created inside the workers context pass instanceof and prototype checks
• outside: we pass Object in from the parent context, objects created in the workers context fail instanceof and prototype checks, but things created outside pass