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@babel/plugin-transform-typeof-symbol
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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
v7.24.1 (2024-03-19)
babel-helper-create-class-features-plugin
, babel-plugin-proposal-decorators
babel-plugin-proposal-decorators
, babel-plugin-proposal-json-modules
, babel-plugin-transform-async-generator-functions
, babel-plugin-transform-regenerator
, babel-plugin-transform-runtime
, babel-preset-env
moduleName
for @babel/runtime/regenerator
imports (@nicolo-ribaudo)babel-helper-create-class-features-plugin
, babel-plugin-proposal-decorators
, babel-plugin-proposal-pipeline-operator
, babel-plugin-transform-class-properties
babel-helper-create-class-features-plugin
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, babel-plugin-proposal-decorators
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babel-code-frame
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chalk
with picocolors
(@nicolo-ribaudo)babel-helper-fixtures
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babel-helpers
, babel-plugin-transform-async-generator-functions
, babel-plugin-transform-class-properties
, babel-plugin-transform-class-static-block
, babel-plugin-transform-modules-commonjs
, babel-plugin-transform-modules-systemjs
, babel-plugin-transform-regenerator
, babel-plugin-transform-runtime
, babel-preset-env
, babel-runtime-corejs3
, babel-runtime
, babel-standalone
babel-helper-module-imports
, babel-plugin-proposal-import-wasm-source
, babel-plugin-proposal-json-modules
, babel-plugin-proposal-record-and-tuple
, babel-plugin-transform-react-jsx-development
, babel-plugin-transform-react-jsx
babel-helper-create-class-features-plugin
, babel-plugin-bugfix-safari-id-destructuring-collision-in-function-expression
, babel-plugin-bugfix-v8-spread-parameters-in-optional-chaining
, babel-plugin-bugfix-v8-static-class-fields-redefine-readonly
, babel-plugin-external-helpers
, babel-plugin-proposal-async-do-expressions
, babel-plugin-proposal-decorators
, babel-plugin-proposal-destructuring-private
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, babel-plugin-proposal-explicit-resource-management
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, babel-plugin-proposal-import-defer
, babel-plugin-proposal-import-wasm-source
, babel-plugin-proposal-json-modules
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, babel-plugin-proposal-partial-application
, babel-plugin-proposal-pipeline-operator
, babel-plugin-proposal-record-and-tuple
, babel-plugin-proposal-regexp-modifiers
, babel-plugin-proposal-throw-expressions
, babel-plugin-syntax-async-do-expressions
, babel-plugin-syntax-decimal
, babel-plugin-syntax-decorators
, babel-plugin-syntax-destructuring-private
, babel-plugin-syntax-do-expressions
, babel-plugin-syntax-explicit-resource-management
, babel-plugin-syntax-export-default-from
, babel-plugin-syntax-flow
, babel-plugin-syntax-function-bind
, babel-plugin-syntax-function-sent
, babel-plugin-syntax-import-assertions
, babel-plugin-syntax-import-attributes
, babel-plugin-syntax-import-defer
, babel-plugin-syntax-import-reflection
, babel-plugin-syntax-import-source
, babel-plugin-syntax-jsx
, babel-plugin-syntax-module-blocks
, babel-plugin-syntax-optional-chaining-assign
, babel-plugin-syntax-partial-application
, babel-plugin-syntax-pipeline-operator
, babel-plugin-syntax-record-and-tuple
, babel-plugin-syntax-throw-expressions
, babel-plugin-syntax-typescript
, babel-plugin-transform-arrow-functions
, babel-plugin-transform-async-generator-functions
, babel-plugin-transform-async-to-generator
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, babel-plugin-transform-block-scoping
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, babel-plugin-transform-instanceof
, babel-plugin-transform-jscript
, babel-plugin-transform-json-strings
, babel-plugin-transform-literals
, babel-plugin-transform-logical-assignment-operators
, babel-plugin-transform-member-expression-literals
, babel-plugin-transform-modules-amd
, babel-plugin-transform-modules-commonjs
, babel-plugin-transform-modules-systemjs
, babel-plugin-transform-modules-umd
, babel-plugin-transform-new-target
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, babel-plugin-transform-optional-catch-binding
, babel-plugin-transform-optional-chaining
, babel-plugin-transform-parameters
, babel-plugin-transform-private-methods
, babel-plugin-transform-private-property-in-object
, babel-plugin-transform-property-literals
, babel-plugin-transform-property-mutators
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, babel-plugin-transform-react-constant-elements
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, babel-plugin-transform-react-jsx-self
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, babel-plugin-transform-runtime
, babel-plugin-transform-shorthand-properties
, babel-plugin-transform-spread
, babel-plugin-transform-sticky-regex
, babel-plugin-transform-strict-mode
, babel-plugin-transform-template-literals
, babel-plugin-transform-typeof-symbol
, babel-plugin-transform-typescript
, babel-plugin-transform-unicode-escapes
, babel-plugin-transform-unicode-property-regex
, babel-plugin-transform-unicode-regex
, babel-plugin-transform-unicode-sets-regex
, babel-preset-env
, babel-preset-flow
, babel-preset-react
, babel-preset-typescript
babel-compat-data
, babel-plugin-transform-object-rest-spread
, babel-preset-env
@babel/compat-data
package.json (@nicolo-ribaudo)babel-helper-replace-supers
, babel-plugin-transform-class-properties
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, babel-plugin-transform-parameters
, babel-plugin-transform-runtime
assertThisInitialized
after super()
(@liuxingbaoyu)babel-plugin-transform-class-properties
, babel-plugin-transform-classes
assertThisInitialized
more often (@liuxingbaoyu)babel-plugin-proposal-decorators
, babel-plugin-transform-class-properties
, babel-plugin-transform-object-rest-spread
, babel-traverse
babel-core
, babel-plugin-external-helpers
, babel-plugin-proposal-decorators
, babel-plugin-proposal-function-bind
, babel-plugin-transform-class-properties
, babel-plugin-transform-classes
, babel-plugin-transform-flow-comments
, babel-plugin-transform-flow-strip-types
, babel-plugin-transform-function-name
, babel-plugin-transform-modules-systemjs
, babel-plugin-transform-parameters
, babel-plugin-transform-private-property-in-object
, babel-plugin-transform-react-jsx
, babel-plugin-transform-runtime
, babel-plugin-transform-spread
, babel-plugin-transform-typescript
, babel-preset-env
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 18,030,342 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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