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/** * @fileoverview Rule to flag use of function declaration identifiers as variables. * @author Ian Christian Myers */ "use strict"; const astUtils = require("./utils/ast-utils"); //------------------------------------------------------------------------------ // Rule Definition //------------------------------------------------------------------------------ /** @type {import('../shared/types').Rule} */ module.exports = { meta: { type: "problem", docs: { description: "Disallow reassigning `function` declarations", recommended: true, url: "https://eslint.org/docs/latest/rules/no-func-assign" }, schema: [], messages: { isAFunction: "'{{name}}' is a function." } }, create(context) { const sourceCode = context.sourceCode; /** * Reports a reference if is non initializer and writable. * @param {References} references Collection of reference to check. * @returns {void} */ function checkReference(references) { astUtils.getModifyingReferences(references).forEach(reference => { context.report({ node: reference.identifier, messageId: "isAFunction", data: { name: reference.identifier.name } }); }); } /** * Finds and reports references that are non initializer and writable. * @param {Variable} variable A variable to check. * @returns {void} */ function checkVariable(variable) { if (variable.defs[0].type === "FunctionName") { checkReference(variable.references); } } /** * Checks parameters of a given function node. * @param {ASTNode} node A function node to check. * @returns {void} */ function checkForFunction(node) { sourceCode.getDeclaredVariables(node).forEach(checkVariable); } return { FunctionDeclaration: checkForFunction, FunctionExpression: checkForFunction }; } };