| /** |
| * @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 |
| //------------------------------------------------------------------------------ |
| |
| module.exports = { |
| meta: { |
| type: "problem", |
| |
| docs: { |
| description: "disallow reassigning `function` declarations", |
| category: "Possible Errors", |
| recommended: true, |
| url: "https://eslint.org/docs/rules/no-func-assign" |
| }, |
| |
| schema: [] |
| }, |
| |
| create(context) { |
| |
| /** |
| * 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, message: "'{{name}}' is a function.", 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) { |
| context.getDeclaredVariables(node).forEach(checkVariable); |
| } |
| |
| return { |
| FunctionDeclaration: checkForFunction, |
| FunctionExpression: checkForFunction |
| }; |
| } |
| }; |