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| /**
| * @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: [],
|
| 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" });
| }
| }
| };
|
| }
| };
|
|
