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babel-types
Advanced tools
The babel-types package is a part of the Babel compiler ecosystem. It provides builders, validators, and conversion utilities for the various types of nodes in the Abstract Syntax Tree (AST) used by Babel. This package is essential for manipulating the AST generated or consumed by Babel, allowing for custom transformations and analysis of JavaScript code.
AST Node Builders
Builders are functions that help in creating AST nodes. This example demonstrates creating a binary expression node that represents the multiplication of two identifiers, 'a' and 'b'.
const t = require('babel-types');
const binaryExpression = t.binaryExpression('*', t.identifier('a'), t.identifier('b'));
AST Node Validators
Validators are functions that check if a node is of a certain type or meets certain criteria. In this example, the validator checks if the node is an identifier with the name 'a'.
const t = require('babel-types');
const isValid = t.isIdentifier(t.identifier('a'), { name: 'a' });
Type Conversion Utilities
Conversion utilities allow for the transformation of one type of node into another. This example shows converting a numeric literal into a string literal.
const t = require('babel-types');
const numericLiteral = t.numericLiteral(5);
const asStringLiteral = t.stringLiteral(`${numericLiteral.value}`);
This is the newer version of babel-types, rebranded and scoped under the Babel organization. It offers the same functionalities but is more actively maintained and includes updates for the latest JavaScript features.
Recast provides AST manipulation capabilities with a focus on preserving the original formatting as much as possible. While babel-types is more about creating and validating AST nodes, recast is geared towards parsing and reprinting code with minimal changes.
Acorn is a fast, small JavaScript parser that generates an AST. While it doesn't offer manipulation utilities like babel-types, it's often used in conjunction with other tools for analysis and transformation tasks.
FAQs
Babel Types is a Lodash-esque utility library for AST nodes
The npm package babel-types receives a total of 2,992,194 weekly downloads. As such, babel-types popularity was classified as popular.
We found that babel-types demonstrated a not healthy version release cadence and project activity because the last version was released a year ago. It has 5 open source maintainers collaborating on the project.
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