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codeql-action/node_modules/eslint/lib/rules/require-yield.js
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/** | |
* @fileoverview Rule to flag the generator functions that does not have yield. | |
* @author Toru Nagashima | |
*/ | |
"use strict"; | |
//------------------------------------------------------------------------------ | |
// Rule Definition | |
//------------------------------------------------------------------------------ | |
/** @type {import('../shared/types').Rule} */ | |
module.exports = { | |
meta: { | |
type: "suggestion", | |
docs: { | |
description: "Require generator functions to contain `yield`", | |
recommended: true, | |
url: "https://eslint.org/docs/latest/rules/require-yield" | |
}, | |
schema: [], | |
messages: { | |
missingYield: "This generator function does not have 'yield'." | |
} | |
}, | |
create(context) { | |
const stack = []; | |
/** | |
* If the node is a generator function, start counting `yield` keywords. | |
* @param {Node} node A function node to check. | |
* @returns {void} | |
*/ | |
function beginChecking(node) { | |
if (node.generator) { | |
stack.push(0); | |
} | |
} | |
/** | |
* If the node is a generator function, end counting `yield` keywords, then | |
* reports result. | |
* @param {Node} node A function node to check. | |
* @returns {void} | |
*/ | |
function endChecking(node) { | |
if (!node.generator) { | |
return; | |
} | |
const countYield = stack.pop(); | |
if (countYield === 0 && node.body.body.length > 0) { | |
context.report({ node, messageId: "missingYield" }); | |
} | |
} | |
return { | |
FunctionDeclaration: beginChecking, | |
"FunctionDeclaration:exit": endChecking, | |
FunctionExpression: beginChecking, | |
"FunctionExpression:exit": endChecking, | |
// Increases the count of `yield` keyword. | |
YieldExpression() { | |
if (stack.length > 0) { | |
stack[stack.length - 1] += 1; | |
} | |
} | |
}; | |
} | |
}; |