58f8093689
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47 lines
1.2 KiB
JavaScript
47 lines
1.2 KiB
JavaScript
/**
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* @fileoverview A rule to disallow negated left operands of the `in` operator
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* @author Michael Ficarra
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* @deprecated in ESLint v3.3.0
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*/
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"use strict";
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//------------------------------------------------------------------------------
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// Rule Definition
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//------------------------------------------------------------------------------
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/** @type {import('../shared/types').Rule} */
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module.exports = {
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meta: {
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type: "problem",
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docs: {
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description: "Disallow negating the left operand in `in` expressions",
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recommended: false,
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url: "https://eslint.org/docs/latest/rules/no-negated-in-lhs"
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},
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replacedBy: ["no-unsafe-negation"],
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deprecated: true,
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schema: [],
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messages: {
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negatedLHS: "The 'in' expression's left operand is negated."
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}
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},
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create(context) {
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return {
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BinaryExpression(node) {
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if (node.operator === "in" && node.left.type === "UnaryExpression" && node.left.operator === "!") {
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context.report({ node, messageId: "negatedLHS" });
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}
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}
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};
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}
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};
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