Inactive Proposals

Inactive proposals are proposals that at one point were presented to the committee but were subsequently abandoned, withdrawn, or rejected.

Proposal	Champion	Rationale
`RegExp.escape`	Domenic Denicola Benjamin Gruenbaum	Rejected: in favor of exploring a template tag function solution
Callable class constructors	Yehuda Katz Allen Wirfs-Brock	Withdrawn: can be solved with decorators
`Error.isError`	Jordan Harband	Withdrawn: in favor of `Error` stack traces proposal
`{Set,Map}.prototype.toJSON`	David Bruant Jordan Harband	Rejected: better solved by a custom replacer function.
Typed Objects	Till Schneidereit (previously Dmitry Lomov, Niko Matsakis)	Postponed: waiting for WebAssembly requirements to become clearer
Object enumerables	Leo Balter John-David Dalton	Rejected
Cancelable Promises	Domenic Denicola	Withdrawn
Proposed Grammar change to ES Modules	Bradley Farias	Rejected: No consensus on this specific solution.
Dynamic Module Reform	Caridy Patiño	Withdrawn: we decided to preserve the current semantics
SIMD.JS - SIMD APIs	Peter Jensen Yehuda Katz	Stage 1: Start with SIMD in WASM; implementations not pursuing SIMD.js for now.
Updates to Tail Calls to include an explicit syntactic opt-in	Brian Terlson Eric Faust	Inactive
Object.shallowEqual	Sebastian Markbage	Withdrawn
`%constructor%.construct`	James M Snell	Withdrawn
`Builtins.typeOf()` and `Builtins.is()`	James M Snell	Withdrawn: can be solved in other ways
Tagged Collection Literals	Kat Marchán	Withdrawn: pursuing `when new` syntax and other alternatives
`Date.parse` fallback semantics	Morgan Phillips	Inactive; likely replaced by uniform parsing of quasi-standard `Date.parse` input
Distinguishing literal strings	Mike West Adam Klein	Withdrawn: Trusted Types no longer a dependent
Annex B — HTML Attribute Event Handlers	Allen Wirfs-Brock	Withdrawn per PR comment
Normative ICU Reference	Domenic Denicola	Withdrawn; champion is no longer participating in TC39
Zones	Domenic Denicola Miško Hevery	Withdrawn; champion is no longer participating in TC39
Blöcks	Domenic Denicola	Withdrawn; champion is no longer participating in TC39
RegExp Atomic Groups & Possessive Quantifiers	Justin Ridgewell	Never presented; engines are not interested in the feature, mainly because it doesn't solve backtracking for most users
RefCollection	Robin Ricard	Withdrawn; replaced with Symbols as WeakMap keys; also there were OCAP/membrane concerns around providing a globally available pre-instantiated RefCollection
Generic Comparison	Hemanth HM Jordan Harband	Withdrawn: replaced with Array Equality
`from ... import`	Bradley Farias	Never presented; preliminary feedback about syntax cost not being worth the weight
TypedArray stride parameter	Shu-yu Guo	Withdrawn: concern about performance implications, and the proposal is not expressive enough
Unused Function Parameters	Gus Caplan	Rejected: the need to solve the problem does not outweigh the hazards

See also the active proposals, stage 1 proposals, stage 0 proposals, and finished proposals documents.

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