mirror of
https://github.com/facebook/react.git
synced 2025-11-01 09:12:30 +00:00
Sebastian Markbåge
d9c333199e
This uses the same mechanism as [large strings](https://github.com/facebook/react/pull/26932) to encode chunks of length based binary data in the RSC payload behind a flag. I introduce a new BinaryChunk type that's specific to each stream and ways to convert into it. That's because we sometimes need all chunks to be Uint8Array for the output, even if the source is another array buffer view, and sometimes we need to clone it before transferring. Each type of typed array is its own row tag. This lets us ensure that the instance is directly in the right format in the cached entry instead of creating a wrapper at each reference. Ideally this is also how Map/Set should work but those are lazy which complicates that approach a bit. We assume both server and client use little-endian for now. If we want to support other modes, we'd convert it to/from little-endian so that the transfer protocol is always little-endian. That way the common clients can be the fastest possible. So far this only implements Server to Client. Still need to implement Client to Server for parity. NOTE: This is the first time we make RSC effectively a binary format. This is not compatible with existing SSR techniques which serialize the stream as unicode in the HTML. To be compatible, those implementations would have to use base64 or something like that. Which is what we'll do when we move this technique to be built-in to Fizz.
47 lines
1.9 KiB
JavaScript
47 lines
1.9 KiB
JavaScript
/**
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* Copyright (c) Meta Platforms, Inc. and affiliates.
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*
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* This source code is licensed under the MIT license found in the
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* LICENSE file in the root directory of this source tree.
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*
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* @flow
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*/
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// This is a host config that's used for the `react-server` package on npm.
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// It is only used by third-party renderers.
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//
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// Its API lets you pass the host config as an argument.
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// However, inside the `react-server` we treat host config as a module.
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// This file is a shim between two worlds.
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//
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// It works because the `react-server` bundle is wrapped in something like:
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//
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// module.exports = function ($$$config) {
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// /* renderer code */
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// }
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//
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// So `$$$config` looks like a global variable, but it's
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// really an argument to a top-level wrapping function.
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declare var $$$config: any;
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export opaque type Destination = mixed; // eslint-disable-line no-undef
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export opaque type PrecomputedChunk = mixed; // eslint-disable-line no-undef
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export opaque type Chunk = mixed; // eslint-disable-line no-undef
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export opaque type BinaryChunk = mixed; // eslint-disable-line no-undef
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export const scheduleWork = $$$config.scheduleWork;
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export const beginWriting = $$$config.beginWriting;
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export const writeChunk = $$$config.writeChunk;
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export const writeChunkAndReturn = $$$config.writeChunkAndReturn;
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export const completeWriting = $$$config.completeWriting;
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export const flushBuffered = $$$config.flushBuffered;
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export const close = $$$config.close;
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export const closeWithError = $$$config.closeWithError;
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export const stringToChunk = $$$config.stringToChunk;
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export const stringToPrecomputedChunk = $$$config.stringToPrecomputedChunk;
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export const typedArrayToBinaryChunk = $$$config.typedArrayToBinaryChunk;
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export const clonePrecomputedChunk = $$$config.clonePrecomputedChunk;
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export const byteLengthOfChunk = $$$config.byteLengthOfChunk;
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export const byteLengthOfBinaryChunk = $$$config.byteLengthOfBinaryChunk;
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