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jerryscript-project / jerryscript

Ultra-lightweight JavaScript engine for the Internet of Things.
https://jerryscript.net
Apache License 2.0
6.94k stars 672 forks source link

Proposal: Retire the legacy ES5.1 build profile #4963

Closed ossy-szeged closed 2 years ago

ossy-szeged commented 2 years ago

JerryScript is a full ES5.1 compliant JavaScript engine since its first release (JerryScript 1.0 in 2016). JavaScript language is continuously evolving: the first popular version (5.1) was released in 2011 and new releases have been rolled out every year since 2015. JavaScript engines are evolving too, JerryScript finished implementing ES2015 features in 2020 and then the project has been retargeted (#3737) to ES.Next (always to the latest ECMAScript specification). Now 83.6% of the Official Conformance Test Suite (Test262) pass - which contains tests for Stage 4 and Stage 3 features too (features will be released in the next or any future specification).

Since there are many incompatible changes between ECMAScript versions, furthermore the ES5.1 specification is more than 10 years old, we would like to drop its support. A pull request is already prepared for this cleanup: #4915. If there are no reasonable objections within two weeks, we would like to drop it.

LaszloLango commented 2 years ago

I have no objections, but I'd like to suggest that put a tag on the last stable commit which contains the ES5.1 build profile. So if someone needs it in the future then they can find it and rollback to it easily.

rerobika commented 2 years ago

No es5.1 related development happened since the 2.4 release so it's a suitable tag for this purpose.

ossy-szeged commented 2 years ago

Already merged in 4924f9fd315e9281a89d0621f278f3a6c1c7efd2