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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: [] | |
| }, | |
| create(context) { | |
| return { | |
| BinaryExpression(node) { | |
| if (node.operator === "in" && node.left.type === "UnaryExpression" && node.left.operator === "!") { | |
| context.report({ node, message: "The 'in' expression's left operand is negated." }); | |
| } | |
| } | |
| }; | |
| } | |
| }; |