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35 lines
910 B
35 lines
910 B
/**
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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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*/
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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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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: true
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},
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schema: []
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},
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create: function(context) {
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return {
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BinaryExpression: function(node) {
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if (node.operator === "in" && node.left.type === "UnaryExpression" && node.left.operator === "!") {
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context.report(node, "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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