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@typescript-eslint/visitor-keys

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    @typescript-eslint/visitor-keys

Visitor keys used to help traverse the TypeScript-ESTree AST


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Package description

What is @typescript-eslint/visitor-keys?

The @typescript-eslint/visitor-keys package provides an enumeration of TypeScript ESTree AST node types and their respective visitor keys. It is primarily used in the context of ESLint plugins and custom rules development to traverse the AST (Abstract Syntax Tree) of TypeScript code and analyze or manipulate the code structure.

What are @typescript-eslint/visitor-keys's main functionalities?

AST Node Traversal

This code demonstrates how to use the visitor keys from the package to traverse an AST node and its children recursively. The `traverseAST` function takes a node and a visitor object that contains methods corresponding to node types. It uses the visitor keys to determine which properties of a node to traverse.

const visitorKeys = require('@typescript-eslint/visitor-keys');

function traverseAST(node, visitor) {
  if (visitor[node.type]) {
    visitor[node.type](node);
  }

  const keys = visitorKeys[node.type] || [];
  keys.forEach((key) => {
    const value = node[key];
    if (Array.isArray(value)) {
      value.forEach(child => traverseAST(child, visitor));
    } else if (value && typeof value === 'object') {
      traverseAST(value, visitor);
    }
  });
}

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Changelog

Source

7.9.0 (2024-05-13)

🚀 Features

  • rule-tester: check for missing placeholder data in the message (#9039)

🩹 Fixes

  • do not pass tsconfig canonical file name to typescript API to get program details for config file (#9042)
  • eslint-plugin: [explicit-function-return-types] fix false positive on default parameters (#9045)

❤️ Thank You

  • Kirk Waiblinger
  • Sheetal Nandi
  • Vinccool96

You can read about our versioning strategy and releases on our website.

Readme

Source

@typescript-eslint/visitor-keys

Visitor keys used to help traverse the TypeScript-ESTree AST.

✋ Internal Package

This is an internal package to the typescript-eslint monorepo. You likely don't want to use it directly.

👉 See https://typescript-eslint.io for docs on typescript-eslint.

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Last updated on 13 May 2024

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