What is @types/estree?
The @types/estree package provides TypeScript type definitions for the ESTree spec, which is a specification for representing JavaScript source code as an abstract syntax tree (AST). These type definitions allow TypeScript developers to work with ASTs in a type-safe manner, ensuring that the structure of the tree is consistent with the ESTree specification.
What are @types/estree's main functionalities?
Defining AST Node Types
This code sample represents a simple AST for a JavaScript program that declares a constant variable 'x' with the value 10. The @types/estree package provides the types that describe the structure of this AST.
{"type": "Program","sourceType": "module","body": [{"type": "VariableDeclaration","declarations": [{"type": "VariableDeclarator","id": {"type": "Identifier","name": "x"},"init": {"type": "Literal","value": 10,"raw": "10"}}],"kind": "const"}]}
Type Checking AST Nodes
This code sample demonstrates how to use the Node type from @types/estree to type-check an AST node and handle it accordingly based on its type.
import { Node } from 'estree';
function processNode(node: Node) {
if (node.type === 'BinaryExpression') {
// Handle binary expression
}
}
Other packages similar to @types/estree
acorn
Acorn is a JavaScript parser that produces an AST based on the ESTree specification. While @types/estree provides type definitions, Acorn provides the actual parsing functionality to generate ASTs from JavaScript code.
espree
Espree is an ECMAScript parser that is built on top of Acorn. Similar to Acorn, it outputs an AST conforming to the ESTree spec. Espree extends Acorn with additional features and ES6+ support.
babel-types
Babel-types is a part of the Babel compiler that provides builders, validators, and converters for Babel's AST, which is slightly different from the ESTree spec. It serves a similar purpose to @types/estree but for Babel's AST format.
Installation
npm install --save @types/estree
Summary
This package contains type definitions for estree (https://github.com/estree/estree).
Details
Files were exported from https://github.com/DefinitelyTyped/DefinitelyTyped/tree/master/types/estree.
Additional Details
- Last updated: Mon, 24 Mar 2025 07:34:10 GMT
- Dependencies: none
Credits
These definitions were written by RReverser.