https://web.dev/shows/http-203/18MRkysjsC0?hl=ja
WeakMaps - HTTP203 | HTTP 203 | web.dev
httpwebdev
https://github.com/tc39/proposal-symbols-as-weakmap-keys
GitHub - tc39/proposal-symbols-as-weakmap-keys: Permit Symbols as keys in WeakMaps, entries in...
Permit Symbols as keys in WeakMaps, entries in WeakSets and WeakRefs, and registered in FinalizationRegistries - tc39/proposal-symbols-as-weakmap-keys
githubproposalsymbols