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Symbols as WeakMap keys

Category

JavaScript

Type

Chromium catches up

Status

In developer trial (Behind a flag) (Chrome In developer trial (Behind a flag))

Intent stage

Prepare to ship

Summary

This proposal allows Symbols to be used as keys in WeakMaps, WeakSet, as the referent in a WeakRef, and as the target in a FinalizationRegistry.

Standards & signals

• Specification: https://tc39.es/proposal-symbols-as-weakmap-keys
• Firefox: Positive — Stage 3 TC39 proposal
• Safari: Positive — Stage 3 TC39 proposal
• Web developers: No signals
• Tracking bug: https://bugs.chromium.org/p/v8/issues/detail?id=12947

Explainers: https://github.com/tc39/proposal-symbols-as-weakmap-keys

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