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