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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('../types').Rule.RuleModule} */
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,
};
},
};
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