Esprima 2.1 Released

Posted on by

We’ve just released Esprima 2.1.0! This release introduces support for several new pieces of ES6 syntax: Classes, Rest Parameters, Computed Property Names, let and const. See the release notes below for full details. We’ve also made various improvements to our testing infrastructure to make the codebase more contributor friendly. A big thank you to all those who contributed patches to this release: Ariya Hidayat, Bei Zhang, Brandon Mills, Mike Rennie, Mike Sherov.

While working on bringing more ES6 features to Esprima, we began collaborating with other JavaScript parsers and parser consumers to help define a community standard for JS AST generation. The result of that effort is the ESTree spec, located here: We wanted to say thank you to all who are contributing, which includes members from Esprima, the Mozilla SpiderMonkey parser, the Acorn parser, and Babel, to name a few. A full list of contributors is located here:

Expect a 2.2 release to follow in a few weeks bringing even more ES6 support. If you’d like to help contribute, we hang out in the #esprima room on Freenode IRC, and have a weekly meeting at 2PM ET on Wednesdays in #esprima-meeting on Freenode IRC as well. We look forward to seeing you there!

Release Notes

  • Support ES6 class #1001
  • Support ES6 rest parameter #1011
  • Support ES6 computed property name #1037
  • Support ES6 lexical declaration #1065
  • Expand the location of property getter, setter, and methods #1029
  • Enable TryStatement transition to a single handler #1031
  • Tolerate unclosed block comment #1041

3 thoughts on “Esprima 2.1 Released