60 lines
1.3 KiB
Plaintext
60 lines
1.3 KiB
Plaintext
/**
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* @fileoverview A rule to disallow negated left operands of the `in` operator
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* @author Michael Ficarra
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* @deprecated in ESLint v3.3.0
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*/
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"use strict";
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//------------------------------------------------------------------------------
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// Rule Definition
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//------------------------------------------------------------------------------
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/** @type {import('../shared/types').Rule} */
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module.exports = {
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meta: {
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type: "problem",
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docs: {
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description:
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"Disallow negating the left operand in `in` expressions",
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recommended: false,
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url: "https://eslint.org/docs/latest/rules/no-negated-in-lhs",
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},
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deprecated: {
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message: "Renamed rule.",
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url: "https://eslint.org/blog/2016/08/eslint-v3.3.0-released/#deprecated-rules",
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deprecatedSince: "3.3.0",
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availableUntil: null,
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replacedBy: [
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{
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rule: {
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name: "no-unsafe-negation",
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url: "https://eslint.org/docs/rules/no-unsafe-negation",
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},
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},
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],
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},
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schema: [],
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messages: {
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negatedLHS: "The 'in' expression's left operand is negated.",
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},
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},
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create(context) {
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return {
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BinaryExpression(node) {
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if (
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node.operator === "in" &&
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node.left.type === "UnaryExpression" &&
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node.left.operator === "!"
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) {
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context.report({ node, messageId: "negatedLHS" });
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}
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},
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};
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},
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};
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