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Edit: no-compare-neg-zero.js
/** * @fileoverview The rule should warn against code that tries to compare against -0. * @author Aladdin-ADD <hh_2013@foxmail.com> */ "use strict"; //------------------------------------------------------------------------------ // Rule Definition //------------------------------------------------------------------------------ module.exports = { meta: { type: "problem", docs: { description: "disallow comparing against -0", category: "Possible Errors", recommended: true, url: "https://eslint.org/docs/rules/no-compare-neg-zero" }, fixable: null, schema: [], messages: { unexpected: "Do not use the '{{operator}}' operator to compare against -0." } }, create(context) { //-------------------------------------------------------------------------- // Helpers //-------------------------------------------------------------------------- /** * Checks a given node is -0 * * @param {ASTNode} node - A node to check. * @returns {boolean} `true` if the node is -0. */ function isNegZero(node) { return node.type === "UnaryExpression" && node.operator === "-" && node.argument.type === "Literal" && node.argument.value === 0; } const OPERATORS_TO_CHECK = new Set([">", ">=", "<", "<=", "==", "===", "!=", "!=="]); return { BinaryExpression(node) { if (OPERATORS_TO_CHECK.has(node.operator)) { if (isNegZero(node.left) || isNegZero(node.right)) { context.report({ node, messageId: "unexpected", data: { operator: node.operator } }); } } } }; } };
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