1 | /**
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2 | * @fileoverview Rule to flag use of function declaration identifiers as variables.
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3 | * @author Ian Christian Myers
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4 | */
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5 |
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6 | ;
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7 |
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8 | const astUtils = require("../ast-utils");
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9 |
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10 | //------------------------------------------------------------------------------
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11 | // Rule Definition
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12 | //------------------------------------------------------------------------------
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13 |
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14 | module.exports = {
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15 | meta: {
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16 | docs: {
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17 | description: "disallow reassigning `function` declarations",
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18 | category: "Possible Errors",
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19 | recommended: true,
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20 | url: "https://eslint.org/docs/rules/no-func-assign"
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21 | },
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22 |
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23 | schema: []
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24 | },
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25 |
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26 | create(context) {
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27 |
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28 | /**
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29 | * Reports a reference if is non initializer and writable.
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30 | * @param {References} references - Collection of reference to check.
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31 | * @returns {void}
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32 | */
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33 | function checkReference(references) {
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34 | astUtils.getModifyingReferences(references).forEach(reference => {
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35 | context.report({ node: reference.identifier, message: "'{{name}}' is a function.", data: { name: reference.identifier.name } });
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36 | });
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37 | }
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38 |
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39 | /**
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40 | * Finds and reports references that are non initializer and writable.
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41 | * @param {Variable} variable - A variable to check.
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42 | * @returns {void}
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43 | */
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44 | function checkVariable(variable) {
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45 | if (variable.defs[0].type === "FunctionName") {
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46 | checkReference(variable.references);
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47 | }
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48 | }
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49 |
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50 | /**
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51 | * Checks parameters of a given function node.
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52 | * @param {ASTNode} node - A function node to check.
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53 | * @returns {void}
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54 | */
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55 | function checkForFunction(node) {
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56 | context.getDeclaredVariables(node).forEach(checkVariable);
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57 | }
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58 |
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59 | return {
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60 | FunctionDeclaration: checkForFunction,
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61 | FunctionExpression: checkForFunction
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62 | };
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63 | }
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64 | };
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