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@babel/helpers

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@babel/helpers

Collection of helper functions used by Babel transforms.

  • 7.26.0
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What is @babel/helpers?

The @babel/helpers package is part of the Babel toolchain, which is primarily used for converting ECMAScript 2015+ code into a backwards compatible version of JavaScript in current and older browsers or environments. This specific package contains a set of functions that are used by Babel's transform plugins to avoid code duplication across generated output. These helpers are small snippets of code that perform common tasks used by the transformations, such as handling classes, spreading properties, etc.

What are @babel/helpers's main functionalities?

Class handling

This code demonstrates a helper function used by Babel to ensure that a class is only instantiated with the `new` keyword, preventing incorrect usage.

"use strict";\nfunction _classCallCheck(instance, Constructor) { if (!(instance instanceof Constructor)) { throw new TypeError(\"Cannot call a class as a function\"); } }\nvar MyClass = function MyClass() { _classCallCheck(this, MyClass); };

Spread properties

This helper function is used to emulate the behavior of the object spread operator `{...obj}`, allowing properties from one or more source objects to be copied into a new object.

"use strict";\nfunction _extends() { _extends = Object.assign || function (target) { for (var i = 1; i < arguments.length; i++) { var source = arguments[i]; for (var key in source) { if (Object.prototype.hasOwnProperty.call(source, key)) { target[key] = source[key]; } } } return target; }; return _extends.apply(this, arguments); }\nvar obj = _extends({}, sourceObj, { key: 'value' });

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Package last updated on 25 Oct 2024

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