@babel/plugin-bugfix-v8-static-class-fields-redefine-readonly

What is @babel/plugin-bugfix-v8-static-class-fields-redefine-readonly?

@babel/plugin-bugfix-v8-static-class-fields-redefine-readonly is a Babel plugin designed to address a specific bug in V8 (the JavaScript engine used in Chrome and Node.js) related to static class fields. This plugin ensures that static class fields are correctly redefined as readonly, preventing unexpected behavior in JavaScript code.

What are @babel/plugin-bugfix-v8-static-class-fields-redefine-readonly's main functionalities?

Fix V8 static class fields bug

This feature ensures that static class fields in JavaScript are correctly treated as readonly, preventing them from being reassigned. The plugin modifies the behavior of static class fields to align with the expected behavior in V8.

class MyClass {
  static myField = 42;
}

MyClass.myField = 100; // This will not change the value of myField due to the plugin

Other packages similar to @babel/plugin-bugfix-v8-static-class-fields-redefine-readonly

@babel/plugin-proposal-class-properties

This Babel plugin allows you to use class properties in your JavaScript code. While it does not specifically address the V8 bug related to static class fields, it provides a broader set of features for working with class properties, both static and instance.

@babel/plugin-transform-classes

This plugin transforms ES6 classes to ES5, ensuring compatibility with older JavaScript environments. It does not specifically address the V8 static class fields bug but provides a comprehensive solution for transforming modern class syntax.

README

@babel/plugin-bugfix-v8-static-class-fields-redefine-readonly

Transform static class fields assignments that are affected by https://crbug.com/v8/12421

See our website @babel/plugin-bugfix-v8-static-class-fields-redefine-readonly for more information.

Install

Using npm:

npm install --save-dev @babel/plugin-bugfix-v8-static-class-fields-redefine-readonly

or using yarn:

yarn add @babel/plugin-bugfix-v8-static-class-fields-redefine-readonly --dev

Changelog

v7.25.9 (2024-10-22)

:bug: Bug Fix

• babel-parser, babel-template, babel-types
  • #16905 fix: Keep type annotations in syntacticPlaceholders mode (@liuxingbaoyu)
• babel-helper-compilation-targets, babel-preset-env
  • #16907 fix: support BROWSERSLIST{,_CONFIG} env (@JLHwung)
• Other
  • #16884 Analyze ClassAccessorProperty to prevent the no-undef rule (@victorenator)

:house: Internal

• babel-helper-transform-fixture-test-runner
  • #16914 remove test options flaky (@JLHwung)

:running_woman: Performance

• babel-parser, babel-types
  • #16918 perf: Make VISITOR_KEYS etc. faster to access (@liuxingbaoyu)