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node_modules/es-abstract/2025/GeneratorStart.js

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+'use strict';
+
+var $TypeError = require('es-errors/type');
+
+var CreateIteratorResultObject = require('./CreateIteratorResultObject');
+var IsCallable = require('./IsCallable');
+
+var SLOT = require('internal-slot');
+var isObject = require('es-object-atoms/isObject');
+
+// https://262.ecma-international.org/16.0/#sec-generatorstart
+
+module.exports = function GeneratorStart(generator, closure) {
+	SLOT.assert(generator, '[[GeneratorState]]');
+	SLOT.assert(generator, '[[GeneratorContext]]');
+	SLOT.assert(generator, '[[GeneratorBrand]]');
+	SLOT.assert(generator, '[[Sentinel]]'); // our userland slot
+	SLOT.assert(generator, '[[CloseIfAbrupt]]'); // our second userland slot
+
+	if (!IsCallable(closure) || closure.length !== 0) {
+		throw new $TypeError('`closure` must be a function that takes no arguments');
+	}
+
+	var sentinel = SLOT.get(closure, '[[Sentinel]]');
+	if (!isObject(sentinel)) {
+		throw new $TypeError('`closure.[[Sentinel]]` must be an object');
+	}
+	SLOT.set(generator, '[[GeneratorContext]]', function () { // steps 2-5
+		try {
+			var result = closure();
+			if (result === sentinel) {
+				SLOT.set(generator, '[[GeneratorState]]', 'COMPLETED');
+				SLOT.set(generator, '[[GeneratorContext]]', null);
+				return CreateIteratorResultObject(void undefined, true);
+			}
+			SLOT.set(generator, '[[GeneratorState]]', 'SUSPENDED-YIELD');
+			return CreateIteratorResultObject(result, false);
+		} catch (e) {
+			SLOT.set(generator, '[[GeneratorState]]', 'COMPLETED');
+			SLOT.set(generator, '[[GeneratorContext]]', null);
+			throw e;
+		}
+	});
+
+	SLOT.set(generator, '[[GeneratorState]]', 'SUSPENDED-START'); // step 6
+};