| /** |
| * @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." }); |
| } |
| } |
| }; |
| |
| } |
| }; |