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codeql-action/node_modules/eslint/lib/rules/no-case-declarations.js
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/** | |
* @fileoverview Rule to flag use of an lexical declarations inside a case clause | |
* @author Erik Arvidsson | |
*/ | |
"use strict"; | |
//------------------------------------------------------------------------------ | |
// Rule Definition | |
//------------------------------------------------------------------------------ | |
/** @type {import('../shared/types').Rule} */ | |
module.exports = { | |
meta: { | |
type: "suggestion", | |
docs: { | |
description: "Disallow lexical declarations in case clauses", | |
recommended: true, | |
url: "https://eslint.org/docs/latest/rules/no-case-declarations" | |
}, | |
schema: [], | |
messages: { | |
unexpected: "Unexpected lexical declaration in case block." | |
} | |
}, | |
create(context) { | |
/** | |
* Checks whether or not a node is a lexical declaration. | |
* @param {ASTNode} node A direct child statement of a switch case. | |
* @returns {boolean} Whether or not the node is a lexical declaration. | |
*/ | |
function isLexicalDeclaration(node) { | |
switch (node.type) { | |
case "FunctionDeclaration": | |
case "ClassDeclaration": | |
return true; | |
case "VariableDeclaration": | |
return node.kind !== "var"; | |
default: | |
return false; | |
} | |
} | |
return { | |
SwitchCase(node) { | |
for (let i = 0; i < node.consequent.length; i++) { | |
const statement = node.consequent[i]; | |
if (isLexicalDeclaration(statement)) { | |
context.report({ | |
node: statement, | |
messageId: "unexpected" | |
}); | |
} | |
} | |
} | |
}; | |
} | |
}; |