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5 |
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6 | "use strict";
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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 |
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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 initializing variables to `undefined`",
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18 | category: "Variables",
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19 | recommended: false,
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20 | url: "https://eslint.org/docs/rules/no-undef-init"
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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 | fixable: "code"
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26 | },
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27 |
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28 | create(context) {
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29 |
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30 | const sourceCode = context.getSourceCode();
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31 |
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32 | return {
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33 |
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34 | VariableDeclarator(node) {
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35 | const name = sourceCode.getText(node.id),
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36 | init = node.init && node.init.name,
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37 | scope = context.getScope(),
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38 | undefinedVar = astUtils.getVariableByName(scope, "undefined"),
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39 | shadowed = undefinedVar && undefinedVar.defs.length > 0;
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40 |
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41 | if (init === "undefined" && node.parent.kind !== "const" && !shadowed) {
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42 | context.report({
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43 | node,
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44 | message: "It's not necessary to initialize '{{name}}' to undefined.",
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45 | data: { name },
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46 | fix(fixer) {
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47 | if (node.parent.kind === "var") {
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48 | return null;
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49 | }
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50 |
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51 | if (node.id.type === "ArrayPattern" || node.id.type === "ObjectPattern") {
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52 |
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53 |
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54 | return null;
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55 | }
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56 | return fixer.removeRange([node.id.range[1], node.range[1]]);
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57 | }
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58 | });
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59 | }
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60 | }
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61 | };
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62 |
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63 | }
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64 | };
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