Intent to prototype: Symbols as WeakMap keys (ECMA 262)

[Yoshi Cheng-Hao Huang]

Summary:

This proposal allows Symbols can be used as keys in WeakMap/WeakSet, and as the target in WeakRef/FinalizationRegistry

Bug:

https://bugzilla.mozilla.org/show_bug.cgi?id=1828144

Standards body:

https://tc39.es/proposal-symbols-as-weakmap-keys/

This proposal has been merged into ecma262

https://tc39.es/ecma262/multipage/executable-code-and-execution-contexts.html#sec-canbeheldweakly

Platform coverage:

All

Preference:

N/A yet

Other browsers:

Chrome has shipped this since 108 behind the flag "--harmony-symbol-as-weakmap-key"

https://groups.google.com/a/chromium.org/g/blink-dev/c/E6pDZP_TiBA/m/ZcXLwiz8AAAJ

and has been enabled by default since April 2023

https://chromium.googlesource.com/v8/v8/+/71ff68830279b7ad6719db066b21f0489e871596

Safari has shipped this since 16.4

https://developer.apple.com/documentation/safari-release-notes/safari-16_4-release-notes

web-platform-tests:

Tests are located in in test262/

https://github.com/tc39/test262/pull/3678