@babel/helper-skip-transparent-expression-wrappers

What is @babel/helper-skip-transparent-expression-wrappers?

The @babel/helper-skip-transparent-expression-wrappers package is a utility within the Babel ecosystem designed to help navigate and manipulate AST (Abstract Syntax Tree) nodes effectively. It specifically aids in skipping over certain 'transparent' wrapper expressions like parentheses that do not semantically change the code but can complicate AST traversal and manipulation. This is particularly useful in scenarios where the goal is to analyze or transform the underlying or 'real' expressions without being obstructed by these wrappers.

What are @babel/helper-skip-transparent-expression-wrappers's main functionalities?

Skipping Transparent Wrappers

This feature allows developers to bypass expressions that do not alter the semantics of the code, such as nested parentheses, to directly access and manipulate the significant AST node. The code sample demonstrates how one might use this package to unwrap a nested expression.

const skipTransparentExprWrappers = require('@babel/helper-skip-transparent-expression-wrappers');

const astNode = parseCodeToAST('((a))'); // Assuming parseCodeToAST is a function that parses code to an AST node
const realNode = skipTransparentExprWrappers(astNode);

Other packages similar to @babel/helper-skip-transparent-expression-wrappers

@babel/traverse

Similar to @babel/helper-skip-transparent-expression-wrappers in its utility for AST manipulation, @babel/traverse provides a comprehensive set of tools for traversing, analyzing, and modifying the AST. While @babel/helper-skip-transparent-expression-wrappers focuses on skipping over transparent wrappers, @babel/traverse offers a broader range of traversal and manipulation capabilities, making it more versatile but also more complex for specific tasks.

recast

Recast is another tool for AST manipulation, offering capabilities to both parse JavaScript code into an AST and to regenerate code from modified ASTs. While it does not specifically target the skipping of transparent expression wrappers, its powerful AST manipulation features allow for similar outcomes through more manual processes. Compared to @babel/helper-skip-transparent-expression-wrappers, recast offers a more holistic approach to code transformation and AST manipulation.

README

@babel/helper-skip-transparent-expression-wrappers

Helper which skips types and parentheses

See our website @babel/helper-skip-transparent-expression-wrappers for more information.

Install

Using npm:

npm install --save @babel/helper-skip-transparent-expression-wrappers

or using yarn:

yarn add @babel/helper-skip-transparent-expression-wrappers

Changelog

v7.25.9 (2024-10-22)

:bug: Bug Fix

• babel-parser, babel-template, babel-types
  • #16905 fix: Keep type annotations in syntacticPlaceholders mode (@liuxingbaoyu)
• babel-helper-compilation-targets, babel-preset-env
  • #16907 fix: support BROWSERSLIST{,_CONFIG} env (@JLHwung)
• Other
  • #16884 Analyze ClassAccessorProperty to prevent the no-undef rule (@victorenator)

:house: Internal

• babel-helper-transform-fixture-test-runner
  • #16914 remove test options flaky (@JLHwung)

:running_woman: Performance

• babel-parser, babel-types
  • #16918 perf: Make VISITOR_KEYS etc. faster to access (@liuxingbaoyu)