// |reftest| async // This file was procedurally generated from the following sources: // - src/async-generators/yield-star-async-return.case // - src/async-generators/default/async-declaration.template /*--- description: execution order for yield* with async iterator and return() (Async generator Function declaration) esid: prod-AsyncGeneratorDeclaration features: [async-iteration, Symbol.asyncIterator] flags: [generated, async] info: | Async Generator Function Definitions AsyncGeneratorDeclaration: async [no LineTerminator here] function * BindingIdentifier ( FormalParameters ) { AsyncGeneratorBody } YieldExpression: yield * AssignmentExpression ... 6. Repeat ... c. Else, i. Assert: received.[[Type]] is return. ii. Let return be ? GetMethod(iterator, "return"). iii. If return is undefined, return Completion(received). iv. Let innerReturnResult be ? Call(return, iterator, « received.[[Value]] »). v. If generatorKind is async, then set innerReturnResult to ? Await(innerReturnResult). ... vii. Let done be ? IteratorComplete(innerReturnResult). viii. If done is true, then 1. Let value be ? IteratorValue(innerReturnResult). 2. If generatorKind is async, then set value to ? Await(value). 3. Return Completion{[[Type]]: return, [[Value]]: value, [[Target]]: empty}. ix. If generatorKind is async, then let received be AsyncGeneratorYield(? IteratorValue(innerResult)). ... AsyncGeneratorYield ( value ) ... 8. Return ! AsyncGeneratorResolve(generator, value, false). ... ---*/ var log = []; var obj = { [Symbol.asyncIterator]() { var returnCount = 0; return { name: 'asyncIterator', get next() { log.push({ name: "get next" }); return function() { return { value: "next-value-1", done: false }; }; }, get return() { log.push({ name: "get return", thisValue: this }); return function() { log.push({ name: "call return", thisValue: this, args: [...arguments] }); returnCount++; if (returnCount == 1) { return { name: "return-promise-1", get then() { log.push({ name: "get return then (1)", thisValue: this }); return function(resolve) { log.push({ name: "call return then (1)", thisValue: this, args: [...arguments] }); resolve({ name: "return-result-1", get value() { log.push({ name: "get return value (1)", thisValue: this }); return "return-value-1"; }, get done() { log.push({ name: "get return done (1)", thisValue: this }); return false; } }); }; } }; } return { name: "return-promise-2", get then() { log.push({ name: "get return then (2)", thisValue: this }); return function(resolve) { log.push({ name: "call return then (2)", thisValue: this, args: [...arguments] }); resolve({ name: "return-result-2", get value() { log.push({ name: "get return value (2)", thisValue: this }); return "return-value-2"; }, get done() { log.push({ name: "get return done (2)", thisValue: this }); return true; } }); }; } }; }; } }; } }; var callCount = 0; async function *gen() { callCount += 1; log.push({ name: "before yield*" }); yield* obj; } var iter = gen(); assert.sameValue(log.length, 0, "log.length"); iter.next().then(v => { assert.sameValue(log[0].name, "before yield*"); assert.sameValue(log[1].name, "get next"); assert.sameValue(v.value, "next-value-1"); assert.sameValue(v.done, false); assert.sameValue(log.length, 2, "log.length"); iter.return("return-arg-1").then(v => { assert.sameValue(log[2].name, "get return"); assert.sameValue(log[2].thisValue.name, "asyncIterator", "get return thisValue"); assert.sameValue(log[3].name, "call return"); assert.sameValue(log[3].thisValue.name, "asyncIterator", "return thisValue"); assert.sameValue(log[3].args.length, 1, "return args.length"); assert.sameValue(log[3].args[0], "return-arg-1", "return args[0]"); assert.sameValue(log[4].name, "get return then (1)"); assert.sameValue(log[4].thisValue.name, "return-promise-1", "get return then thisValue"); assert.sameValue(log[5].name, "call return then (1)"); assert.sameValue(log[5].thisValue.name, "return-promise-1", "return then thisValue"); assert.sameValue(log[5].args.length, 2, "return then args.length"); assert.sameValue(typeof log[5].args[0], "function", "return then args[0]"); assert.sameValue(typeof log[5].args[1], "function", "return then args[1]"); assert.sameValue(log[6].name, "get return done (1)"); assert.sameValue(log[6].thisValue.name, "return-result-1", "get return done thisValue"); assert.sameValue(log[7].name, "get return value (1)"); assert.sameValue(log[7].thisValue.name, "return-result-1", "get return value thisValue"); assert.sameValue(v.value, "return-value-1"); assert.sameValue(v.done, false); assert.sameValue(log.length, 8, "log.length"); iter.return("return-arg-2").then(v => { assert.sameValue(log[8].name, "get return"); assert.sameValue(log[8].thisValue.name, "asyncIterator", "get return thisValue"); assert.sameValue(log[9].name, "call return"); assert.sameValue(log[9].thisValue.name, "asyncIterator", "return thisValue"); assert.sameValue(log[9].args.length, 1, "return args.length"); assert.sameValue(log[9].args[0], "return-arg-2", "return args[0]"); assert.sameValue(log[10].name, "get return then (2)"); assert.sameValue(log[10].thisValue.name, "return-promise-2", "get return then thisValue"); assert.sameValue(log[11].name, "call return then (2)"); assert.sameValue(log[11].thisValue.name, "return-promise-2", "return then thisValue"); assert.sameValue(log[11].args.length, 2, "return then args.length"); assert.sameValue(typeof log[11].args[0], "function", "return then args[0]"); assert.sameValue(typeof log[11].args[1], "function", "return then args[1]"); assert.sameValue(log[12].name, "get return done (2)"); assert.sameValue(log[12].thisValue.name, "return-result-2", "get return done thisValue"); assert.sameValue(log[13].name, "get return value (2)"); assert.sameValue(log[13].thisValue.name, "return-result-2", "get return value thisValue"); assert.sameValue(v.value, "return-value-2"); assert.sameValue(v.done, true); assert.sameValue(log.length, 14, "log.length"); }).then($DONE, $DONE); }).catch($DONE); }).catch($DONE); assert.sameValue(callCount, 1);