Withdrawn proposals are proposals that at one point were presented to the committee but was subsequently abandoned.
| Proposal | Champion | Rationale |
|---|---|---|
| Callable class constructors | Yehuda Katz and Allen Wirfs-Brock | Can be solved with decorators |
| Error.isError | Jordan Harband | Withdrawn in favor of a proposal to standardize Error stack traces |
| Set/Map.prototype.toJSON | David Bruant and Jordan Harband | Better solved by a custom replacer function. |