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42 lines
1.1 KiB
42 lines
1.1 KiB
/** |
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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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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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category: "Possible Errors", |
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recommended: false, |
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url: "https://eslint.org/docs/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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}, |
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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, message: "The 'in' expression's left operand is negated." }); |
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} |
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} |
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}; |
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} |
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};
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