The classic static block proposal adds the ability for JavaScript classes to have one or more static initialization blocks. These blocks are initialized once per evaluation of the class definition. ``` class C { static s_field; static { this.s_field = doSomeInitialization(); } } ```


Specification link

Specification being incubated in a Community Group

Status in Chromium


Enabled by default (tracking bug)

Consensus & Standardization

After a feature ships in Chrome, the values listed here are not guaranteed to be up to date.



This is a Stage 3 TC39 proposal.

Last updated on 2022-01-14