@eslint-community/eslint-utils

getStaticValue

The `getStaticValue` function evaluates the static value of a given AST node. This is useful for determining the value of constants and literals in the code.

const { getStaticValue } = require('@eslint-community/eslint-utils');
const espree = require('espree');

const ast = espree.parse('const foo = 42;', { ecmaVersion: 2020 });
const node = ast.body[0].declarations[0].init;
const value = getStaticValue(node);
console.log(value); // { value: 42 }

ReferenceTracker

The `ReferenceTracker` class helps track references to global variables and properties. This is useful for identifying where and how certain variables or properties are used in the code.

const { ReferenceTracker } = require('@eslint-community/eslint-utils');
const espree = require('espree');
const eslintScope = require('eslint-scope');

const ast = espree.parse('const foo = { bar: 42 }; foo.bar;', { ecmaVersion: 2020 });
const scopeManager = eslintScope.analyze(ast);
const tracker = new ReferenceTracker(scopeManager);

for (const { node } of tracker.iterateGlobalReferences({ foo: { bar: true } })) {
  console.log(node); // Node representing `foo.bar`
}

getFunctionHeadLocation

The `getFunctionHeadLocation` function returns the location of the function head, which includes the function keyword, name, and parameters. This is useful for reporting issues related to function definitions.

const { getFunctionHeadLocation } = require('@eslint-community/eslint-utils');
const espree = require('espree');

const ast = espree.parse('function foo() {}', { ecmaVersion: 2020 });
const node = ast.body[0];
const location = getFunctionHeadLocation(node, { sourceCode: { text: 'function foo() {}' } });
console.log(location); // { start: { line: 1, column: 0 }, end: { line: 1, column: 13 } }