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[Flight] Assume __turbopack_load_by_url__ returns a cached Promise (#33792)

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Sebastian "Sebbie" Silbermann 2025-07-16 13:20:10 +02:00 committed by GitHub
parent fe813143e2
commit d85ec5f5bd
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1 changed files with 15 additions and 14 deletions
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27
packages/react-server-dom-turbopack/src/client/ReactFlightClientConfigBundlerTurbopack.js vendored
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@ -132,12 +132,6 @@ export function resolveServerReference<T>(
return [resolvedModuleData.id, resolvedModuleData.chunks, name];
}
// The chunk cache contains all the chunks we've preloaded so far.
// If they're still pending they're a thenable. This map also exists
// in Turbopack but unfortunately it's not exposed so we have to
// replicate it in user space. null means that it has already loaded.
const chunkCache: Map<string, null | Promise<any>> = new Map();
function requireAsyncModule(id: string): null | Thenable<any> {
// We've already loaded all the chunks. We can require the module.
const promise = __turbopack_require__(id);
@ -165,6 +159,13 @@ function requireAsyncModule(id: string): null | Thenable<any> {
}
}
// Turbopack will return cached promises for the same chunk.
// We still want to keep track of which chunks we have already instrumented
// and which chunks have already been loaded until Turbopack returns instrumented
// thenables directly.
const instrumentedChunks: WeakSet<Thenable<any>> = new WeakSet();
const loadedChunks: WeakSet<Thenable<any>> = new WeakSet();
function ignoreReject() {
// We rely on rejected promises to be handled by another listener.
}
@ -174,19 +175,19 @@ export function preloadModule<T>(
metadata: ClientReference<T>,
): null | Thenable<any> {
const chunks = metadata[CHUNKS];
const promises = [];
const promises: Promise<any>[] = [];
for (let i = 0; i < chunks.length; i++) {
const chunkFilename = chunks[i];
const entry = chunkCache.get(chunkFilename);
if (entry === undefined) {
const thenable = loadChunk(chunkFilename);
if (!loadedChunks.has(thenable)) {
promises.push(thenable);
}
if (!instrumentedChunks.has(thenable)) {
// $FlowFixMe[method-unbinding]
const resolve = chunkCache.set.bind(chunkCache, chunkFilename, null);
const resolve = loadedChunks.add.bind(loadedChunks, thenable);
thenable.then(resolve, ignoreReject);
chunkCache.set(chunkFilename, thenable);
} else if (entry !== null) {
promises.push(entry);
instrumentedChunks.add(thenable);
}
}
if (isAsyncImport(metadata)) {