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/** * @fileoverview Rule to disallow negating the left operand of relational operators * @author Toru Nagashima */ "use strict"; //------------------------------------------------------------------------------ // Requirements //------------------------------------------------------------------------------ const astUtils = require("./utils/ast-utils"); //------------------------------------------------------------------------------ // Helpers //------------------------------------------------------------------------------ /** * Checks whether the given operator is `in` or `instanceof` * @param {string} op The operator type to check. * @returns {boolean} `true` if the operator is `in` or `instanceof` */ function isInOrInstanceOfOperator(op) { return op === "in" || op === "instanceof"; } /** * Checks whether the given operator is an ordering relational operator or not. * @param {string} op The operator type to check. * @returns {boolean} `true` if the operator is an ordering relational operator. */ function isOrderingRelationalOperator(op) { return op === "<" || op === ">" || op === ">=" || op === "<="; } /** * Checks whether the given node is a logical negation expression or not. * @param {ASTNode} node The node to check. * @returns {boolean} `true` if the node is a logical negation expression. */ function isNegation(node) { return node.type === "UnaryExpression" && node.operator === "!"; } //------------------------------------------------------------------------------ // Rule Definition //------------------------------------------------------------------------------ /** @type {import('../shared/types').Rule} */ module.exports = { meta: { type: "problem", docs: { description: "Disallow negating the left operand of relational operators", recommended: true, url: "https://eslint.org/docs/latest/rules/no-unsafe-negation" }, hasSuggestions: true, schema: [ { type: "object", properties: { enforceForOrderingRelations: { type: "boolean", default: false } }, additionalProperties: false } ], fixable: null, messages: { unexpected: "Unexpected negating the left operand of '{{operator}}' operator.", suggestNegatedExpression: "Negate '{{operator}}' expression instead of its left operand. This changes the current behavior.", suggestParenthesisedNegation: "Wrap negation in '()' to make the intention explicit. This preserves the current behavior." } }, create(context) { const sourceCode = context.sourceCode; const options = context.options[0] || {}; const enforceForOrderingRelations = options.enforceForOrderingRelations === true; return { BinaryExpression(node) { const operator = node.operator; const orderingRelationRuleApplies = enforceForOrderingRelations && isOrderingRelationalOperator(operator); if ( (isInOrInstanceOfOperator(operator) || orderingRelationRuleApplies) && isNegation(node.left) && !astUtils.isParenthesised(sourceCode, node.left) ) { context.report({ node, loc: node.left.loc, messageId: "unexpected", data: { operator }, suggest: [ { messageId: "suggestNegatedExpression", data: { operator }, fix(fixer) { const negationToken = sourceCode.getFirstToken(node.left); const fixRange = [negationToken.range[1], node.range[1]]; const text = sourceCode.text.slice(fixRange[0], fixRange[1]); return fixer.replaceTextRange(fixRange, `(${text})`); } }, { messageId: "suggestParenthesisedNegation", fix(fixer) { return fixer.replaceText(node.left, `(${sourceCode.getText(node.left)})`); } } ] }); } } }; } };