59 lines
1.4 KiB
JavaScript
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' });
|
|
}
|
|
},
|
|
};
|
|
},
|
|
};
|