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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; } } }; } };