@babel/helper-replace-supers

What is @babel/helper-replace-supers?

@babel/helper-replace-supers is a Babel helper module that assists in handling super method calls and super property accesses in JavaScript classes. It is particularly useful when transforming ES6+ code to ES5, ensuring that the semantics of super calls are preserved correctly.

What are @babel/helper-replace-supers's main functionalities?

Super Method Call Replacement

This feature allows you to replace super method calls within a class method. The `replaceSuper` function is used to handle the transformation, ensuring that the correct object and super references are maintained.

const { replaceSuper } = require('@babel/helper-replace-supers');

function replaceSuperMethodCall(path, state) {
  replaceSuper(path, state, {
    getObjectRef() {
      return path.node.object;
    },
    getSuperRef() {
      return path.node.super;
    },
    file: state.file
  });
}

Super Property Access Replacement

This feature allows you to replace super property accesses within a class. Similar to method call replacement, the `replaceSuper` function ensures that property accesses are correctly transformed.

const { replaceSuper } = require('@babel/helper-replace-supers');

function replaceSuperPropertyAccess(path, state) {
  replaceSuper(path, state, {
    getObjectRef() {
      return path.node.object;
    },
    getSuperRef() {
      return path.node.super;
    },
    file: state.file
  });
}

Other packages similar to @babel/helper-replace-supers

babel-plugin-transform-es2015-classes

This plugin is part of the Babel preset for transforming ES2015 (ES6) classes to ES5. It handles super method calls and property accesses, ensuring compatibility with older JavaScript environments.

README

@babel/helper-replace-supers

Helper function to replace supers

See our website @babel/helper-replace-supers for more information.

Install

Using npm:

npm install --save @babel/helper-replace-supers

or using yarn:

yarn add @babel/helper-replace-supers

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)