@babel/plugin-transform-typeof-symbol
Advanced tools
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
v7.16.0 (2021-10-30)
babel-helpers, babel-plugin-proposal-async-generator-functions, babel-runtime-corejs2, babel-runtime-corejs3, babel-runtime
for-await (@nicolo-ribaudo)babel-generator, babel-parser, babel-plugin-transform-typescript, babel-types
babel-parser
babel-helper-fixtures, babel-helper-transform-fixture-test-runner, babel-parser, babel-plugin-syntax-typescript, babel-preset-typescript
.mts and .cts files in @babel/preset-typescript (@nicolo-ribaudo)@babel/eslint-parser (@nicolo-ribaudo)babel-generator, babel-parser, babel-plugin-proposal-pipeline-operator, babel-plugin-syntax-pipeline-operator
babel-compat-data, babel-generator, babel-parser, babel-preset-env, babel-types
babel-helper-skip-transparent-expression-wrappers, babel-plugin-proposal-optional-chaining
skipTransparentExprWrapperNodes helper (@lightmare)babel-traverse, babel-types
babel-parser, babel-plugin-transform-typescript
babel-plugin-transform-typescript
babel-core, babel-helper-create-class-features-plugin, babel-plugin-transform-typescript
babel-compat-data, babel-plugin-bugfix-safari-id-destructuring-collision-in-function-expression, babel-plugin-bugfix-v8-spread-parameters-in-optional-chaining, babel-plugin-transform-react-constant-elements, babel-preset-env, babel-traverse
babel-plugin-proposal-async-generator-functions, babel-traverse
babel-traverse, babel-types
babel-generator
workspace:^ to specify @babel/ dependencies (@nicolo-ribaudo)babel-helper-fixtures, babel-plugin-proposal-class-properties, babel-plugin-transform-runtime, babel-preset-react
babel-types
createTypeAnnotationBasedOnTypeof (babel-types) (@lightmare)babel-helpers
babel-core, babel-plugin-transform-react-jsx-development, babel-plugin-transform-react-jsx, babel-types
babel-types
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)
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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