@babel/plugin-transform-block-scoped-functions
Advanced tools
Babel plugin to ensure function declarations at the block level are block scoped
The @babel/plugin-transform-block-scoped-functions npm package is designed to ensure that functions defined within blocks (such as if statements or for loops) are properly scoped to those blocks in environments that may not support this feature natively. This is particularly useful for ensuring compatibility with older browsers or JavaScript environments that do not fully implement ES6 scoping rules.
Function Scoping
This feature ensures that functions defined within a block are scoped to that block. This is important for compatibility with ES6, where functions are block-scoped, unlike in ES5 where they are function-scoped. The plugin transforms the code to work correctly in environments that do not support block scoping natively.
"use strict";\n\nif (true) {\n function foo() { return 1; }\n}\n\nfoo(); // Throws ReferenceError in ES6, transformed code works by scoping function within the blockSimilar to @babel/plugin-transform-block-scoped-functions, this package transforms let and const declarations to be properly scoped to blocks, ensuring compatibility with older environments. While @babel/plugin-transform-block-scoped-functions focuses specifically on function declarations, @babel/plugin-transform-block-scoping handles all block-scoped declarations.
While not a direct equivalent, @babel/preset-env includes @babel/plugin-transform-block-scoped-functions as part of its comprehensive transformation of ES6+ code to be compatible with a target environment. It provides a broader range of transformations, including block-scoped functions, making it a more versatile choice for projects needing wide-ranging compatibility.
Babel plugin to ensure function declarations at the block level are block scoped
See our website @babel/plugin-transform-block-scoped-functions for more information.
Using npm:
npm install --save-dev @babel/plugin-transform-block-scoped-functions
or using yarn:
yarn add @babel/plugin-transform-block-scoped-functions --dev
v7.25.9 (2024-10-22)
babel-parser, babel-template, babel-types
syntacticPlaceholders mode (@liuxingbaoyu)babel-helper-compilation-targets, babel-preset-env
ClassAccessorProperty to prevent the no-undef rule (@victorenator)babel-parser, babel-types
VISITOR_KEYS etc. faster to access (@liuxingbaoyu)FAQs
Babel plugin to ensure function declarations at the block level are block scoped
The npm package @babel/plugin-transform-block-scoped-functions receives a total of 24,255,658 weekly downloads. As such, @babel/plugin-transform-block-scoped-functions popularity was classified as popular.
We found that @babel/plugin-transform-block-scoped-functions demonstrated a healthy version release cadence and project activity because the last version was released less than a year ago. It has 4 open source maintainers collaborating on the project.
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