-
Notifications
You must be signed in to change notification settings - Fork 1.9k
Expand file tree
/
Copy pathModuleLoader.js
More file actions
611 lines (534 loc) · 23.9 KB
/
ModuleLoader.js
File metadata and controls
611 lines (534 loc) · 23.9 KB
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
/*
* Copyright (C) 2015, 2016 Apple Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
// https://whatwg.github.io/loader/#loader-object
// Module Loader has several hooks that can be customized by the platform.
// For example, the [[Fetch]] hook can be provided by the JavaScriptCore shell
// as fetching the payload from the local file system.
// Currently, there are 4 hooks.
// 1. Loader.resolve
// 2. Loader.fetch
@linkTimeConstant
function setStateToMax(entry, newState)
{
// https://whatwg.github.io/loader/#set-state-to-max
"use strict";
if (entry.state < newState)
entry.state = newState;
}
@linkTimeConstant
function newRegistryEntry(key, type)
{
// https://whatwg.github.io/loader/#registry
//
// Each registry entry becomes one of the 5 states.
// 1. Fetch
// Ready to fetch (or now fetching) the resource of this module.
// Typically, we fetch the source code over the network or from the file system.
// a. If the status is Fetch and there is no entry.fetch promise, the entry is ready to fetch.
// b. If the status is Fetch and there is the entry.fetch promise, the entry is just fetching the resource.
//
// 2. Instantiate (AnalyzeModule)
// Ready to instantiate (or now instantiating) the module record from the fetched
// source code.
// Typically, we parse the module code, extract the dependencies and binding information.
// a. If the status is Instantiate and there is no entry.instantiate promise, the entry is ready to instantiate.
// b. If the status is Instantiate and there is the entry.fetch promise, the entry is just instantiating
// the module record.
//
// 3. Satisfy
// Ready to request the dependent modules (or now requesting & resolving).
// Without this state, the current draft causes infinite recursion when there is circular dependency.
// a. If the status is Satisfy and there is no entry.satisfy promise, the entry is ready to resolve the dependencies.
// b. If the status is Satisfy and there is the entry.satisfy promise, the entry has resolved the dependencies.
//
// 4. Link
// Ready to link the module with the other modules.
// Linking means that the module imports and exports the bindings from/to the other modules.
//
// 5. Ready
// The module is linked, so the module is ready to be executed.
//
// Each registry entry has the 4 promises; "fetch", "instantiate" and "satisfy".
// They are assigned when starting the each phase. And they are fulfilled when the each phase is completed.
//
// In the current module draft, linking will be performed after the whole modules are instantiated and the dependencies are resolved.
// And execution is also done after the all modules are linked.
//
// TODO: We need to exploit the way to execute the module while fetching non-related modules.
// One solution; introducing the ready promise chain to execute the modules concurrently while keeping
// the execution order.
"use strict";
return {
key: key,
type: type,
state: @ModuleFetch,
fetch: @undefined,
instantiate: @undefined,
satisfy: @undefined,
isSatisfied: false,
dependencies: [], // To keep the module order, we store the module keys in the array.
module: @undefined, // JSModuleRecord
linkError: @undefined,
linkSucceeded: true,
evaluated: false,
then: @undefined,
isAsync: false,
};
}
@visibility=PrivateRecursive
function ensureRegistered(key, type)
{
// https://whatwg.github.io/loader/#ensure-registered
"use strict";
if (type === @undefined)
type = 'js-wasm';
var entryMap = this.registry.@get(key);
var entry;
if (entryMap) {
entry = entryMap.@get(type);
if (entry)
return entry;
} else {
entryMap = new @Map;
this.registry.@set(key, entryMap);
}
entry = @newRegistryEntry(key, type);
entryMap.@set(type, entry);
return entry;
}
@linkTimeConstant
function forceFulfillPromise(promise, value)
{
"use strict";
@assert(@isPromise(promise));
if ((@getPromiseInternalField(promise, @promiseFieldFlags) & @promiseStateMask) === @promiseStatePending)
@fulfillPromise(promise, value);
}
@linkTimeConstant
function fulfillFetch(entry, source)
{
// https://whatwg.github.io/loader/#fulfill-fetch
"use strict";
if (!entry.fetch) {
var promiseConstructor = @InternalPromise;
entry.fetch = @createPromise(promiseConstructor, /* isInternalPromise */ true);
}
@forceFulfillPromise(entry.fetch, source);
@setStateToMax(entry, @ModuleInstantiate);
}
// Loader.
@visibility=PrivateRecursive
function requestFetch(entry, parameters, fetcher)
{
// https://whatwg.github.io/loader/#request-fetch
"use strict";
if (entry.fetch) {
var promiseConstructor = @InternalPromise;
var newPromise = @createPromise(promiseConstructor, /* isInternalPromise */ true);
entry.fetch.then(
(result) => @fulfillPromiseWithFirstResolvingFunctionCallCheck(newPromise, result),
(error) => @rejectPromiseWithFirstResolvingFunctionCallCheck(newPromise, this.createTypeErrorCopy(error)));
return newPromise;
}
// Hook point.
// 2. Loader.fetch
// https://whatwg.github.io/loader/#browser-fetch
// Take the key and fetch the resource actually.
// For example, JavaScriptCore shell can provide the hook fetching the resource
// from the local file system.
var fetchPromise = this.fetch(entry.key, parameters, fetcher).then((source) => {
@setStateToMax(entry, @ModuleInstantiate);
return source;
});
entry.fetch = fetchPromise;
return fetchPromise;
}
@visibility=PrivateRecursive
function requestInstantiate(entry, parameters, fetcher)
{
// https://whatwg.github.io/loader/#request-instantiate
"use strict";
// entry.instantiate is set if fetch succeeds.
if (entry.instantiate)
return entry.instantiate;
var instantiatePromise = (async () => {
var source = await this.requestFetch(entry, parameters, fetcher);
// https://html.spec.whatwg.org/#fetch-a-single-module-script
// Now fetching request succeeds. Then even if instantiation fails, we should cache it.
// Instantiation won't be retried.
if (entry.instantiate)
return await entry.instantiate;
entry.instantiate = instantiatePromise;
var key = entry.key;
var type = entry.type;
var moduleRecord = await this.parseModule(key, source);
var dependenciesMap = moduleRecord.dependenciesMap;
var requestedModules = this.requestedModules(moduleRecord);
var dependencies = @newArrayWithSize(requestedModules.length);
for (var i = 0, length = requestedModules.length; i < length; ++i) {
var item = requestedModules[i];
var depName = item.key;
var depKey = this.resolve(depName, key, fetcher);
var depEntry = this.ensureRegistered(depKey, item.type);
@putByValDirect(dependencies, i, depEntry);
dependenciesMap.@set(depName, depEntry);
}
entry.dependencies = dependencies;
entry.module = moduleRecord;
@setStateToMax(entry, @ModuleSatisfy);
return entry;
})();
return instantiatePromise;
}
@linkTimeConstant
function cacheSatisfy(entry)
{
"use strict";
@setStateToMax(entry, @ModuleLink);
entry.satisfy = (async () => {
return entry;
})();
}
@linkTimeConstant
function cacheSatisfyAndReturn(entry, depEntries, satisfyingEntries)
{
"use strict";
entry.isSatisfied = true;
for (var i = 0, length = depEntries.length; i < length; ++i) {
if (!depEntries[i].isSatisfied) {
entry.isSatisfied = false;
break;
}
}
if (entry.isSatisfied)
@cacheSatisfy(entry);
else
satisfyingEntries.@add(entry);
return entry;
}
@visibility=PrivateRecursive
function requestSatisfy(entry, parameters, fetcher, visited)
{
// If the root's requestSatisfyUtil is fulfilled, then all reachable entries by the root
// should be fulfilled. And this is why:
//
// 1. The satisfyingEntries set is only updated when encountering
// an entry that has a visited and unSatisfied dependency. Given
// the following dependency graph and assume requestInstantiate(d)
// consuming much more time than others. Then, the satisfyingEntries
// would contain entries (a), (b), and (c).
//
// 2. The way we handle visited entry (a) is to check wether it's
// instantiated instead of satisfied. This helps us to avoid infinitely looping
// but we shouldn't mark the entry (c) as satisfied since we don't know
// whether the first entry (a) of the loop has it's dependencies (d) satisfied.
// A counter example for previous requestSatisfy implementation is shown below [1].
//
// 3. If requestSatisfyUtil(a) is fulfilled, then entry (d) must be satisfied.
// Then, we can say entries (a), (b), and (c) are satisfied.
//
// 4. A dependency graph may have multiple circles. Once requestSatisfyUtil(r) is fulfilled,
// then all requestSatisfyUtil promises for the first entries of the circles must be fulfilled.
// In that case, all entries added to satisfyingEntries set are satisfied.
//
// d
// ^
// |
// r -> a -> b -> c -> e
// ^ |
// | |
// -----------
//
// FIXME: Ideally we should use DFS (https://tc39.es/ecma262/#sec-moduledeclarationlinking)
// to track strongly connected component (SCC). If the requestSatisfyUtil
// promise for the start entry of the SCC is fulfilled, then we can mark all entries
// of the SCC satisfied. However, current requestSatisfyUtil cannot guarantee DFS due
// to various requestInstantiate time for children. And we don't prefer to force DFS.
// This is because if one child requests a lot of time in requestInstantiate, then the
// other children have to wait for it. And this is expensive. BTW, we don't have concept
// satisfy in spec see:
// 1. https://tc39.es/ecma262/#sec-import-calls
// 2. https://tc39.es/ecma262/#sec-ContinueDynamicImport
// 3. https://tc39.es/ecma262/#sec-LoadRequestedModules
// 4. https://tc39.es/ecma262/#sec-InnerModuleLoading
//
// [1] Counter Example
//
// Given module dependency graph:
//
// r1 ---> b ---> c
// | ^
// | |
// -----> a <--- r2
//
// Note that here we treat requestInstantiate as a background execution for simplification.
// And requestInstantiate1 is the 1st requestInstantiate call in requestSatisfyUtil and
// requestInstantiate2 is the 2nd requestInstantiate call for visited depEntry.
// `->` means goto in below steps.
//
// Step 1: Dynamically import r1 and r2
// -> requestImportModule(r1) -> requestSatisfyUtil(r1, v1) -> v1.add(r1) -> requestInstantiate1(r1)
// -> requestImportModule(r2) -> requestSatisfyUtil(r2, v2) -> v2.add(r2) -> requestInstantiate1(r2)
// Background Executions = [ requestInstantiate1(r1), requestInstantiate1(r2) ]
//
// Step 2: requestInstantiate1(r1) is done then go for it's dependencies [ b, a ]
// -> !v1.has(b) -> requestSatisfyUtil(b, v1) -> v1.add(b) -> requestInstantiate1(b)
// -> !v1.has(a) -> requestSatisfyUtil(a, v1) -> v1.add(a) -> requestInstantiate1(a)
// Background Executions = [ requestInstantiate1(r2), requestInstantiate1(b), requestInstantiate1(a) ]
//
// Step 3: requestInstantiate1(b) is done then go for it's dependencies [ c ]
// -> !v1.has(c) -> requestSatisfyUtil(c, v1) -> v1.add(c) -> requestInstantiate1(c)
// Background Executions = [ requestInstantiate1(r2), requestInstantiate1(a), requestInstantiate1(c) ]
//
// Step 4: requestInstantiate1(a) is done then go for it's dependencies [ b ]
// -> v1.has(b) -> requestInstantiate2(b)
// -> Since requestInstantiate1(b) cached in Step 3 and b is the only dependency a has, requestSatisfyUtil(a, v1) is fulfilled and cached to Entry(a).satisfy.
// Background Executions = [ requestInstantiate1(r2), requestInstantiate1(c) ]
//
// Step 5: requestInstantiate1(r2) is done then go for it's dependencies [ a ]
// -> !v2.has(a) -> requestSatisfyUtil(a, v2)
// -> Since requestSatisfyUtil(a) is cached in Step 4 and a is the only dependency r2 has, requestSatisfyUtil(r2, v2) is fulfilled and cached.
// -> linkAndEvaluateModule(r2) -> link(r2) crashes since c is not instantiated.
// Background Executions = [ requestInstantiate1(c) ]
//
"use strict";
var satisfyingEntries = new @Set;
return this.requestSatisfyUtil(entry, parameters, fetcher, visited, satisfyingEntries).then((entry) => {
satisfyingEntries.@forEach((satisfyingEntry) => {
@cacheSatisfy(satisfyingEntry);
satisfyingEntry.isSatisfied = true;
});
return entry;
});
}
@visibility=PrivateRecursive
function requestSatisfyUtil(entry, parameters, fetcher, visited, satisfyingEntries)
{
// https://html.spec.whatwg.org/#internal-module-script-graph-fetching-procedure
"use strict";
if (entry.satisfy)
return entry.satisfy;
visited.@add(entry);
var satisfyPromise = this.requestInstantiate(entry, parameters, fetcher).then((entry) => {
if (entry.satisfy)
return entry.satisfy;
var depLoads = this.requestedModuleParameters(entry.module);
for (var i = 0, length = entry.dependencies.length; i < length; ++i) {
var parameters = depLoads[i];
var depEntry = entry.dependencies[i];
var promise;
// Recursive resolving. The dependencies of this entry is being resolved or already resolved.
// Stop tracing the circular dependencies.
// But to retrieve the instantiated module record correctly,
// we need to wait for the instantiation for the dependent module.
// For example, reaching here, the module is starting resolving the dependencies.
// But the module may or may not reach the instantiation phase in the loader's pipeline.
// If we wait for the Satisfy for this module, it construct the circular promise chain and
// rejected by the Promises runtime. Since only we need is the instantiated module, instead of waiting
// the Satisfy for this module, we just wait Instantiate for this.
if (visited.@has(depEntry))
promise = this.requestInstantiate(depEntry, parameters, fetcher);
else {
// Currently, module loader do not pass any information for non-top-level module fetching.
promise = this.requestSatisfyUtil(depEntry, parameters, fetcher, visited, satisfyingEntries);
}
@putByValDirect(depLoads, i, promise);
}
// We cannot cache the following promise chain to Entry.satisfy since there might be a infinite recursive
// promise resolution chain. See example:
//
// r1 ---> a ---> b <--- r2
// ^ |
// |-------
//
// Step 1: Dynamically import r1 and r2
// requestImportModule(r1) -> requestSatisfyUtil(r1, v1) -> v1.add(r1) -> requestInstantiate1(r1)
// requestImportModule(r2) -> requestSatisfyUtil(r2, v2) -> v2.add(r2) -> requestInstantiate1(r2)
// Background Executions = [ requestInstantiate1(r1), requestInstantiate1(r2) ]
//
// Step 2: requestInstantiate1(r1) is done then go for it's dependencies [ a ]
// -> !v1.has(a) -> requestSatisfyUtil(a, v1, r1) -> v1.add(a) -> requestInstantiate1(a, r1)
// -> Entry(r1).satisfy = promise.all(requestSatisfyUtil(a, v1, r1)).then(...)
// Background Executions = [ requestInstantiate1(r2), requestInstantiate1(a, r1) ]
//
// Step 3: requestInstantiate1(r2) is done then go for it's dependencies [ b ]
// -> !v2.has(b) -> requestSatisfyUtil(b, v2, r2) -> v2.add(b) -> requestInstantiate1(b, r2)
// -> Entry(r2).satisfy = promise.all(requestSatisfyUtil(b, v2, r2)).then(...)
// Background Executions = [ requestInstantiate1(a, r1), requestInstantiate1(b, r2) ]
//
// Step 4: requestInstantiate1(b, r2) is done then go for it's dependencies [ a ]
// -> !v2.has(a) -> requestSatisfyUtil(a, v2, r2) -> v2.add(b) -> requestInstantiate1(a, r2)
// -> Entry(b).satisfy = promise.all(requestSatisfyUtil(a, v2, r2)).then(...)
// Background Executions = [ requestInstantiate1(a, r1), requestInstantiate1(a, r2) ]
//
// Step 4: requestInstantiate1(a, r1) is done then got for it's dependencies [ b ]
// -> !v1.has(b) -> requestSatisfyUtil(b, v1, r1) -> returns Entry(b).satisfy since step 4
// -> Entry(a).satisfy = promise.all(promise.all(requestSatisfyUtil(a, v2, r2)).then(...)) // infinite recursive promise resolution chain
// Background Executions = [ requestInstantiate1(a, r2) ]
//
// From now on, module a will be satisfied if module a is satisfied.
//
return @InternalPromise.internalAll(depLoads).then((depEntries) => {
if (entry.satisfy)
return entry;
return @cacheSatisfyAndReturn(entry, depEntries, satisfyingEntries);
});
});
return satisfyPromise;
}
// Linking semantics.
@visibility=PrivateRecursive
function link(entry, fetcher)
{
// https://html.spec.whatwg.org/#fetch-the-descendants-of-and-instantiate-a-module-script
"use strict";
if (entry.state < @ModuleLink)
@throwTypeError("Requested module is not instantiated yet.");
if (!entry.linkSucceeded)
throw entry.linkError;
if (entry.state === @ModuleReady)
return;
@setStateToMax(entry, @ModuleReady);
try {
// Since we already have the "dependencies" field,
// we can call moduleDeclarationInstantiation with the correct order
// without constructing the dependency graph by calling dependencyGraph.
var hasAsyncDependency = false;
var dependencies = entry.dependencies;
for (var i = 0, length = dependencies.length; i < length; ++i) {
var dependency = dependencies[i];
this.link(dependency, fetcher);
hasAsyncDependency ||= dependency.isAsync;
}
entry.isAsync = this.moduleDeclarationInstantiation(entry.module, fetcher) || hasAsyncDependency;
} catch (error) {
entry.linkSucceeded = false;
entry.linkError = error;
throw error;
}
}
// Module semantics.
@visibility=PrivateRecursive
function moduleEvaluation(entry, fetcher)
{
// http://www.ecma-international.org/ecma-262/6.0/#sec-moduleevaluation
"use strict";
if (entry.evaluated)
return;
entry.evaluated = true;
// The contents of the [[RequestedModules]] is cloned into entry.dependencies.
var dependencies = entry.dependencies;
if (!entry.isAsync) {
// Since linking sets isAsync for any strongly connected component with an async module we should only get here if all our dependencies are also sync.
for (var i = 0, length = dependencies.length; i < length; ++i) {
var dependency = dependencies[i];
@assert(!dependency.isAsync);
this.moduleEvaluation(dependency, fetcher);
}
this.evaluate(entry.key, entry.module, fetcher);
} else
return this.asyncModuleEvaluation(entry, fetcher, dependencies);
}
@visibility=PrivateRecursive
async function asyncModuleEvaluation(entry, fetcher, dependencies)
{
"use strict";
for (var i = 0, length = dependencies.length; i < length; ++i)
await this.moduleEvaluation(dependencies[i], fetcher);
var resumeMode = @GeneratorResumeModeNormal;
while (true) {
var awaitedValue = this.evaluate(entry.key, entry.module, fetcher, awaitedValue, resumeMode);
if (@getAbstractModuleRecordInternalField(entry.module, @abstractModuleRecordFieldState) == @GeneratorStateExecuting)
return;
try {
awaitedValue = await awaitedValue;
resumeMode = @GeneratorResumeModeNormal;
} catch (e) {
awaitedValue = e;
resumeMode = @GeneratorResumeModeThrow;
}
}
}
// APIs to control the module loader.
@visibility=PrivateRecursive
function provideFetch(key, value)
{
"use strict";
var entry = this.ensureRegistered(key);
if (entry.state > @ModuleFetch)
@throwTypeError("Requested module is already fetched.");
@fulfillFetch(entry, value);
}
@visibility=PrivateRecursive
async function loadModule(key, parameters, fetcher)
{
"use strict";
var entry = await this.requestSatisfy(this.ensureRegistered(key, this.typeFromParameters(parameters)), parameters, fetcher, new @Set);
return entry.key;
}
@visibility=PrivateRecursive
function linkAndEvaluateModule(key, fetcher, type)
{
"use strict";
var entry = this.ensureRegistered(key, type);
this.link(entry, fetcher);
return this.moduleEvaluation(entry, fetcher);
}
@visibility=PrivateRecursive
async function loadAndEvaluateModule(moduleName, parameters, fetcher)
{
"use strict";
var key = this.resolve(moduleName, @undefined, fetcher);
var type = this.typeFromParameters(parameters);
key = await this.loadModule(key, parameters, fetcher);
return await this.linkAndEvaluateModule(key, fetcher, type);
}
@visibility=PrivateRecursive
async function requestImportModule(moduleName, referrer, parameters, fetcher)
{
"use strict";
var key = this.resolve(moduleName, referrer, fetcher);
var type = this.typeFromParameters(parameters);
var entry = await this.requestSatisfy(this.ensureRegistered(key, type), parameters, fetcher, new @Set);
await this.linkAndEvaluateModule(entry.key, fetcher, type);
return this.getModuleNamespaceObject(entry.module);
}
@visibility=PrivateRecursive
function dependencyKeysIfEvaluated(key)
{
"use strict";
var entryMap = this.registry.@get(key);
if (!entryMap)
return null;
var entry = entryMap.@get('js-wasm');
if (!entry || !entry.evaluated)
return null;
var dependencies = entry.dependencies;
var length = dependencies.length;
var result = new @Array(length);
for (var i = 0; i < length; ++i)
result[i] = dependencies[i].key;
return result;
}