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7 | "use strict";
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8 |
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12 |
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13 | module.exports = {
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14 | meta: {
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15 | type: "problem",
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16 |
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17 | docs: {
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18 | description: "disallow negating the left operand in `in` expressions",
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19 | category: "Possible Errors",
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20 | recommended: false,
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21 | url: "https://eslint.org/docs/rules/no-negated-in-lhs"
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22 | },
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23 |
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24 | replacedBy: ["no-unsafe-negation"],
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25 |
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26 | deprecated: true,
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27 | schema: [],
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28 |
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29 | messages: {
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30 | negatedLHS: "The 'in' expression's left operand is negated."
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31 | }
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32 | },
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33 |
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34 | create(context) {
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35 |
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36 | return {
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37 |
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38 | BinaryExpression(node) {
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39 | if (node.operator === "in" && node.left.type === "UnaryExpression" && node.left.operator === "!") {
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40 | context.report({ node, messageId: "negatedLHS" });
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41 | }
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42 | }
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43 | };
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44 |
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45 | }
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46 | };
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