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@types/estree
Advanced tools
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.
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
}
}
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 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 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.
npm install --save @types/estree
This package contains type definitions for ESTree AST specification (https://github.com/estree/estree).
Files were exported from https://www.github.com/DefinitelyTyped/DefinitelyTyped/tree/types-2.0/estree
Additional Details
These definitions were written by RReverser https://github.com/RReverser.
FAQs
TypeScript definitions for estree
The npm package @types/estree receives a total of 20,111,760 weekly downloads. As such, @types/estree popularity was classified as popular.
We found that @types/estree demonstrated a healthy version release cadence and project activity because the last version was released less than a year ago. It has 1 open source maintainer collaborating on the project.
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