@babel/plugin-transform-parameters
Advanced tools
Compile ES2015 default and rest parameters to ES5
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.
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); }Similar to the destructuring aspect of @babel/plugin-transform-parameters, this plugin transforms destructuring assignments and rest/spread properties to ES5. However, it focuses more broadly on destructuring patterns outside of function parameters as well.
This plugin transforms spread elements into a form that can be understood by environments without native support for this syntax. While it deals with the spread operator like the rest parameters feature of @babel/plugin-transform-parameters, it's applied in array literals and function calls rather than function parameters.
Compile ES2015 default and rest parameters to ES5
See our website @babel/plugin-transform-parameters for more information.
Using npm:
npm install --save-dev @babel/plugin-transform-parameters
or using yarn:
yarn add @babel/plugin-transform-parameters --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
Compile ES2015 default and rest parameters to ES5
The npm package @babel/plugin-transform-parameters receives a total of 20,412,134 weekly downloads. As such, @babel/plugin-transform-parameters popularity was classified as popular.
We found that @babel/plugin-transform-parameters 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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