no-negated-in-lhs.js•1.19 kB
/**
* @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('../shared/types').Rule} */
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"
},
replacedBy: ["no-unsafe-negation"],
deprecated: true,
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" });
}
}
};
}
};