setTimeout 'this' requirement

Confirmed Issue #8282928 • Assigned to Kris K.


Calvin M.
Jul 26, 2016
This issue is public.
Reported by 2 people

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Steps to reproduce

IE and edge have a check for what the this object of setTimeout is that is superfluous and unexpected, the following fails

({setTimeout:setTimeout}).setTimeout(fn, 0)

this can also come up if you cache setTimeout into a variable and the script get executed via eval (see this issue).

Fix: if you remove the check for ‘valid calling object’ this bug would go away.

No other browser or environment I am aware of implements this check


Comments and activity

  • I couldn’t reproduce with the given snippet, but I could using this repo:

    I’ve also attached the repo as a zip file in case it goes down. Just run npm install and npm start.

    Error is:

    Unhandled rejection TypeError: Invalid calling object
    at process.nextTick (eval code:82:9)
  • yeah turns out it’s everyone except node that the first snipit fails for, looks like the eval one is the bigger issue, that one is unique to edge.

  • Microsoft Edge Team

    Changed Assigned To to “Christian F.”

    Changed Assigned To to “Travis L.”

    Changed Assigned To from “Travis L.” to “Kris K.”

    Changed Status to “Confirmed”

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