@babel/plugin-transform-new-target
Advanced tools
The @babel/plugin-transform-new-target npm package is designed to transform instances of the `new.target` meta-property within functions. This is particularly useful for compiling ES6 code to be compatible with environments that do not support the `new.target` syntax. The `new.target` property is used within constructors to determine if the constructor was called with the `new` operator, allowing constructors to identify how they were invoked and to behave differently if necessary.
Transforming new.target
This feature allows the transformation of `new.target` usage into a form that can be understood by environments that do not support this syntax. It checks if the constructor was called with `new` and throws an error if it wasn't, ensuring that the constructor behaves as intended even in older JavaScript environments.
function MyConstructor() {\n if (!new.target) {\n throw 'MyConstructor must be called with new';\n }\n console.log('MyConstructor was called with new');\n}\n// Transformed Code:\nfunction MyConstructor() {\n var _newtarget = this instanceof MyConstructor ? this.constructor : void 0;\n if (!_newtarget) {\n throw 'MyConstructor must be called with new';\n }\n console.log('MyConstructor was called with new');\n}Similar to @babel/plugin-transform-new-target, this package transforms ES6 arrow functions into function expressions that older JavaScript environments can understand. While it focuses on arrow functions rather than the `new.target` property, both plugins serve the purpose of making modern JavaScript code compatible with older environments.
This package transforms ES6 class syntax into equivalent ES5 constructor functions. Like @babel/plugin-transform-new-target, it deals with issues related to constructor functions and their invocation, ensuring that class-based code can run in environments that do not support the ES6 class syntax.
Transforms new.target meta property
See our website @babel/plugin-transform-new-target for more information.
Using npm:
npm install --save-dev @babel/plugin-transform-new-target
or using yarn:
yarn add @babel/plugin-transform-new-target --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
Transforms new.target meta property
The npm package @babel/plugin-transform-new-target receives a total of 19,198,301 weekly downloads. As such, @babel/plugin-transform-new-target popularity was classified as popular.
We found that @babel/plugin-transform-new-target 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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