There were several items on the agenda, this post focuses on feature proposals and their progress from the 101th TC39 meeting [8-11th April 2024].

Stage 1:

• Error.isError: Error.isError tests if a value is an Error instance, irrespective of its Realm origin.

• Signals: A declarative programming model for updating based on changes to state.

• Strict using: Proposal to mandate the use of using for certain resources.

Stage 2.7:

• Math.sumPrecise: summation method.

• Promise.try: an ergonomic, readable, and intuitive way to invoke a function and always get a Promise.

Stage 3:

• Redeclarable global eval-introduced vars: Make eval-introduced global vars redeclarable.

• Dynamic code brand checks:Flexible brand checks before dynamic code loading.

Stage 4:

• Set Methods: New Set methods

• Duplicate named capture groups: allow regex capturing group names to be repeated