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AsyncIterator: Attempting to change value of a readonly property

See original GitHub issue

What

When including the es2018 bundle, we get the following exception on some iOS devices.

Details

The stack trace points to the asyncIterator polyfill.

Additional information

Example user agents:

Mozilla/5.0 (iPhone; CPU iPhone OS 13_5_1 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Mobile/15E148 Instagram 144.0.0.17.119 (iPhone12,1; iOS 13_5_1; en_CA; en-CA; scale=2.00; 828x1792; 217426887)
Mozilla/5.0 (iPhone; CPU iPhone OS 13_5_1 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Mobile/15E148 Instagram 148.0.0.26.120 (iPhone10,3; iOS 13_5_1; en_US; en-US; scale=3.00; 1125x2436; 226453516)
Mozilla/5.0 (iPhone; CPU iPhone OS 13_5_1 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/13.1.1 Mobile/15E148 Safari/604.1
Mozilla/5.0 (iPhone; CPU iPhone OS 13_5 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) GSA/114.0.318129667 Mobile/15E148 Safari/604.1

Possibly related #230

Issue Analytics

State:
Created 3 years ago
Comments:7 (3 by maintainers)

Top GitHub Comments

1reaction

klarstrupcommented, Jan 20, 2022

Still seeing this around on 3.110.1

1reaction

vanderhoopcommented, Nov 1, 2021

Hey @JakeChampion, we’re still seeing this issue of attempting to overwrite the readonly and already available Symbol.asyncIterator API, specifically in iOS safari, versions 14.X and 15.X.

Interestingly enough, we’re not seeing this on Mac OS, even on the latest versions (14.X and 15.X). I suspect this is due to the user agent string of the iOS safaris

We’re on polyfill.io, version 3.108.0

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