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eb39fafa DC |
1 | /** |
2 | * @fileoverview A rule to disallow negated left operands of the `in` operator | |
3 | * @author Michael Ficarra | |
4 | * @deprecated in ESLint v3.3.0 | |
5 | */ | |
6 | ||
7 | "use strict"; | |
8 | ||
9 | //------------------------------------------------------------------------------ | |
10 | // Rule Definition | |
11 | //------------------------------------------------------------------------------ | |
12 | ||
13 | module.exports = { | |
14 | meta: { | |
15 | type: "problem", | |
16 | ||
17 | docs: { | |
18 | description: "disallow negating the left operand in `in` expressions", | |
eb39fafa DC |
19 | recommended: false, |
20 | url: "https://eslint.org/docs/rules/no-negated-in-lhs" | |
21 | }, | |
22 | ||
23 | replacedBy: ["no-unsafe-negation"], | |
24 | ||
25 | deprecated: true, | |
26 | schema: [], | |
27 | ||
28 | messages: { | |
29 | negatedLHS: "The 'in' expression's left operand is negated." | |
30 | } | |
31 | }, | |
32 | ||
33 | create(context) { | |
34 | ||
35 | return { | |
36 | ||
37 | BinaryExpression(node) { | |
38 | if (node.operator === "in" && node.left.type === "UnaryExpression" && node.left.operator === "!") { | |
39 | context.report({ node, messageId: "negatedLHS" }); | |
40 | } | |
41 | } | |
42 | }; | |
43 | ||
44 | } | |
45 | }; |