codtracker-js/node_modules/eslint/lib/rules/no-negated-in-lhs.js
2025-04-19 23:12:19 -04:00

59 lines
1.4 KiB
JavaScript

/**
* @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
//------------------------------------------------------------------------------
/** @type {import('../types').Rule.RuleModule} */
module.exports = {
meta: {
type: 'problem',
docs: {
description: 'Disallow negating the left operand in `in` expressions',
recommended: false,
url: 'https://eslint.org/docs/latest/rules/no-negated-in-lhs',
},
deprecated: {
message: 'Renamed rule.',
url: 'https://eslint.org/blog/2016/08/eslint-v3.3.0-released/#deprecated-rules',
deprecatedSince: '3.3.0',
availableUntil: null,
replacedBy: [
{
rule: {
name: 'no-unsafe-negation',
url: 'https://eslint.org/docs/rules/no-unsafe-negation',
},
},
],
},
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' });
}
},
};
},
};