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/** * @fileoverview Rule to disallow a negated condition * @author Alberto RodrÃguez */ "use strict"; //------------------------------------------------------------------------------ // Rule Definition //------------------------------------------------------------------------------ module.exports = { meta: { type: "suggestion", docs: { description: "disallow negated conditions", category: "Stylistic Issues", recommended: false, url: "https://eslint.org/docs/rules/no-negated-condition" }, schema: [] }, create(context) { /** * Determines if a given node is an if-else without a condition on the else * @param {ASTNode} node The node to check. * @returns {boolean} True if the node has an else without an if. * @private */ function hasElseWithoutCondition(node) { return node.alternate && node.alternate.type !== "IfStatement"; } /** * Determines if a given node is a negated unary expression * @param {Object} test The test object to check. * @returns {boolean} True if the node is a negated unary expression. * @private */ function isNegatedUnaryExpression(test) { return test.type === "UnaryExpression" && test.operator === "!"; } /** * Determines if a given node is a negated binary expression * @param {Test} test The test to check. * @returns {boolean} True if the node is a negated binary expression. * @private */ function isNegatedBinaryExpression(test) { return test.type === "BinaryExpression" && (test.operator === "!=" || test.operator === "!=="); } /** * Determines if a given node has a negated if expression * @param {ASTNode} node The node to check. * @returns {boolean} True if the node has a negated if expression. * @private */ function isNegatedIf(node) { return isNegatedUnaryExpression(node.test) || isNegatedBinaryExpression(node.test); } return { IfStatement(node) { if (!hasElseWithoutCondition(node)) { return; } if (isNegatedIf(node)) { context.report({ node, message: "Unexpected negated condition." }); } }, ConditionalExpression(node) { if (isNegatedIf(node)) { context.report({ node, message: "Unexpected negated condition." }); } } }; } };