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@babel/plugin-transform-parameters

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@babel/plugin-transform-parameters

Compile ES2015 default and rest parameters to ES5

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What is @babel/plugin-transform-parameters?

The @babel/plugin-transform-parameters package is a Babel plugin that transforms function parameter features, such as default parameters, destructured parameters, and rest parameters, into ES5-compatible syntax. This transformation allows developers to use modern JavaScript features while maintaining compatibility with older environments that may not support these newer syntaxes natively.

What are @babel/plugin-transform-parameters's main functionalities?

Default Parameters

Transforms functions with default parameters to check for `undefined` and assign a default value if necessary. This allows for cleaner function signatures and easier parameter handling.

function log(message = 'Default message') { console.log(message); }

Destructured Parameters

Enables the use of destructuring in function parameters, transforming it into a series of variable assignments for compatibility. This simplifies the extraction of properties from objects passed as function arguments.

function greet({ name, age }) { console.log(`Hello ${name}, you are ${age} years old.`); }

Rest Parameters

Transforms rest parameters into a standard ES5 arguments pattern, allowing functions to accept an indefinite number of arguments as an array.

function concatenate(separator, ...strings) { return strings.join(separator); }

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Package last updated on 22 Oct 2024

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