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Viewing file:     require-yield.js (1.68 KB)      -rw-r--r--

/**
 * @fileoverview Rule to flag the generator functions that does not have yield.
 * @author Toru Nagashima
 */

"use strict";

//------------------------------------------------------------------------------
// Rule Definition
//------------------------------------------------------------------------------

/** @type {import('../types').Rule.RuleModule} */
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;
				}
			},
		};
	},
};