63 lines
1.9 KiB
JavaScript
63 lines
1.9 KiB
JavaScript
/**
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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("../ast-utils");
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//------------------------------------------------------------------------------
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// Rule Definition
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//------------------------------------------------------------------------------
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module.exports = {
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meta: {
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docs: {
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description: "disallow reassigning `function` declarations",
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category: "Possible Errors",
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recommended: true
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},
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schema: []
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},
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create(context) {
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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({ node: reference.identifier, message: "'{{name}}' is a function.", data: { name: reference.identifier.name } });
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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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context.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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