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