@babel/plugin-transform-typeof-symbol
Advanced tools
This transformer wraps all typeof expressions with a method that replicates native behaviour. (ie. returning “symbol” for symbols)
Package description
The @babel/plugin-transform-typeof-symbol package is a plugin for Babel, a JavaScript compiler, that ensures the behavior of the 'typeof' operator is spec-compliant when used with symbols. In environments that do not fully support symbols, this plugin transforms 'typeof' checks to a method that can correctly identify 'symbol' types.
Transform typeof checks for symbols
This code represents the transformation that the plugin applies to 'typeof' checks. It defines a function that can correctly identify symbols, even in environments that do not natively support the 'symbol' type.
var _typeof = function(obj) { return obj && typeof Symbol !== 'undefined' && obj.constructor === Symbol ? 'symbol' : typeof obj; };This package helps to reuse Babel's injected helper code to save on codesize. It includes a typeof helper for symbols, similar to what @babel/plugin-transform-typeof-symbol provides, but it's part of a broader set of transformations.
Although not a direct alternative, core-js is a modular standard library for JavaScript, which includes polyfills for symbols. It ensures that 'typeof' checks for symbols work correctly in older environments, similar to the goal of @babel/plugin-transform-typeof-symbol.
Changelog
v7.24.8 (2024-07-11)
babel-parser
declare (@liuxingbaoyu)babel-generator
in in for heads (@nicolo-ribaudo)await using (@nicolo-ribaudo)babel-parser
using declarations (@H0onnn).value: undefined to regexp literals (@liuxingbaoyu)babel-types
ObjectTypeInternalSlot visitor keys (@nicolo-ribaudo)babel-plugin-transform-typescript
export import x = (@liuxingbaoyu)babel-generator
async in for await (@nicolo-ribaudo)babel-traverse
Scope.globals multiple times (@liuxingbaoyu)Readme
This transformer wraps all typeof expressions with a method that replicates native behaviour. (ie. returning “symbol” for symbols)
See our website @babel/plugin-transform-typeof-symbol for more information.
Using npm:
npm install --save-dev @babel/plugin-transform-typeof-symbol
or using yarn:
yarn add @babel/plugin-transform-typeof-symbol --dev
FAQs
This transformer wraps all typeof expressions with a method that replicates native behaviour. (ie. returning “symbol” for symbols)
The npm package @babel/plugin-transform-typeof-symbol receives a total of 13,996,236 weekly downloads. As such, @babel/plugin-transform-typeof-symbol popularity was classified as popular.
We found that @babel/plugin-transform-typeof-symbol 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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