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codeql-action/node_modules/eslint/lib/rules/no-negated-condition.js
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/** | |
* @fileoverview Rule to disallow a negated condition | |
* @author Alberto Rodríguez | |
*/ | |
"use strict"; | |
//------------------------------------------------------------------------------ | |
// Rule Definition | |
//------------------------------------------------------------------------------ | |
/** @type {import('../shared/types').Rule} */ | |
module.exports = { | |
meta: { | |
type: "suggestion", | |
docs: { | |
description: "Disallow negated conditions", | |
recommended: false, | |
url: "https://eslint.org/docs/latest/rules/no-negated-condition" | |
}, | |
schema: [], | |
messages: { | |
unexpectedNegated: "Unexpected negated condition." | |
} | |
}, | |
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, | |
messageId: "unexpectedNegated" | |
}); | |
} | |
}, | |
ConditionalExpression(node) { | |
if (isNegatedIf(node)) { | |
context.report({ | |
node, | |
messageId: "unexpectedNegated" | |
}); | |
} | |
} | |
}; | |
} | |
}; |