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@babel/traverse

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@babel/traverse

The Babel Traverse module maintains the overall tree state, and is responsible for replacing, removing, and adding nodes

    7.23.4
    GitHub
    npm

Version published
Maintainers
4
Weekly downloads
35,921,152
decreased by-16.95%

Weekly downloads

Package description

What is @babel/traverse?

The @babel/traverse package is part of the Babel toolchain and is used for traversing and manipulating the abstract syntax tree (AST) generated by Babel. It provides methods to visit nodes in the tree, update them, add or remove nodes, and perform various transformations on the code represented by the AST.

What are @babel/traverse's main functionalities?

Visiting Nodes

This feature allows you to visit specific nodes in the AST. You can specify the types of nodes you're interested in and provide functions that will be called when those nodes are encountered during traversal.

{"type": "Identifier", "name": "a"}

Modifying Nodes

With @babel/traverse, you can modify nodes in the AST. This can include changing node types, adding or removing properties, or even replacing a node with a different one.

{"type": "Identifier", "name": "b"}

Adding and Removing Nodes

This feature allows you to add new nodes to the AST or remove existing ones. This is useful for code transformations where you need to introduce new variables, functions, or other constructs, or clean up unused code.

{"type": "VariableDeclaration", "declarations": [{"type": "VariableDeclarator", "id": {"type": "Identifier", "name": "c"}, "init": {"type": "Literal", "value": 3, "raw": "3"}}], "kind": "const"}

Scope Management

The package provides utilities for managing scope within the AST. This includes tracking variable declarations, bindings, and references, which is crucial for correctly transforming code without introducing errors.

{"type": "BlockStatement", "body": [], "directives": []}

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Changelog

Source

v7.23.4 (2023-11-20)

:bug: Bug Fix
  • babel-generator
    • #16104 fix: Pure comments missing parentheses (@liuxingbaoyu)

Readme

Source

@babel/traverse

The Babel Traverse module maintains the overall tree state, and is responsible for replacing, removing, and adding nodes

See our website @babel/traverse for more information or the issues associated with this package.

Install

Using npm:

npm install --save-dev @babel/traverse

or using yarn:

yarn add @babel/traverse --dev

FAQs

Last updated on 20 Nov 2023

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