| 1 | /** |
| 2 | * Copyright (c) Meta Platforms, Inc. and affiliates. |
| 3 | * |
| 4 | * This source code is licensed under the MIT license found in the |
| 5 | * LICENSE file in the root directory of this source tree. |
| 6 | * |
| 7 | * @flow |
| 8 | */ |
| 9 | |
| 10 | /* global Bun */ |
| 11 | |
| 12 | import type {Writable} from 'stream'; |
| 13 | |
| 14 | type BunReadableStreamController = ReadableStreamController & { |
| 15 | end(): mixed, |
| 16 | write(data: Chunk | BinaryChunk): void, |
| 17 | error(error: Error): void, |
| 18 | flush?: () => void, |
| 19 | }; |
| 20 | |
| 21 | interface MightBeFlushable { |
| 22 | flush?: () => void; |
| 23 | } |
| 24 | |
| 25 | export type Destination = |
| 26 | | BunReadableStreamController |
| 27 | | (Writable & MightBeFlushable); |
| 28 | |
| 29 | export type PrecomputedChunk = string; |
| 30 | export opaque type Chunk = string; |
| 31 | export type BinaryChunk = $ArrayBufferView; |
| 32 | |
| 33 | export function scheduleWork(callback: () => void) { |
| 34 | setTimeout(callback, 0); |
| 35 | } |
| 36 | |
| 37 | export const scheduleMicrotask = queueMicrotask; |
| 38 | |
| 39 | export function flushBuffered(destination: Destination) { |
| 40 | // Bun direct streams provide a flush function. |
| 41 | // If we don't have any more data to send right now. |
| 42 | // Flush whatever is in the buffer to the wire. |
| 43 | if (typeof destination.flush === 'function') { |
| 44 | destination.flush(); |
| 45 | } |
| 46 | } |
| 47 | |
| 48 | export function beginWriting(destination: Destination) {} |
| 49 | |
| 50 | export function writeChunk( |
| 51 | destination: Destination, |
| 52 | chunk: PrecomputedChunk | Chunk | BinaryChunk, |
| 53 | ): void { |
| 54 | if (chunk.length === 0) { |
| 55 | return; |
| 56 | } |
| 57 | |
| 58 | // $FlowFixMe[incompatible-type]: write() is compatible with both types in Bun |
| 59 | destination.write(chunk); |
| 60 | } |
| 61 | |
| 62 | export function writeChunkAndReturn( |
| 63 | destination: Destination, |
| 64 | chunk: PrecomputedChunk | Chunk | BinaryChunk, |
| 65 | ): boolean { |
| 66 | // $FlowFixMe[incompatible-type]: write() is compatible with both types in Bun |
| 67 | return !!destination.write(chunk); |
| 68 | } |
| 69 | |
| 70 | export function completeWriting(destination: Destination) {} |
| 71 | |
| 72 | export function close(destination: Destination) { |
| 73 | destination.end(); |
| 74 | } |
| 75 | |
| 76 | export function stringToChunk(content: string): Chunk { |
| 77 | return content; |
| 78 | } |
| 79 | |
| 80 | export function stringToPrecomputedChunk(content: string): PrecomputedChunk { |
| 81 | return content; |
| 82 | } |
| 83 | |
| 84 | export function typedArrayToBinaryChunk( |
| 85 | content: $ArrayBufferView, |
| 86 | ): BinaryChunk { |
| 87 | // TODO: Does this needs to be cloned if it's transferred in enqueue()? |
| 88 | return content; |
| 89 | } |
| 90 | |
| 91 | export function byteLengthOfChunk(chunk: Chunk | PrecomputedChunk): number { |
| 92 | return Buffer.byteLength(chunk, 'utf8'); |
| 93 | } |
| 94 | |
| 95 | export function byteLengthOfBinaryChunk(chunk: BinaryChunk): number { |
| 96 | return chunk.byteLength; |
| 97 | } |
| 98 | |
| 99 | export function closeWithError(destination: Destination, error: mixed): void { |
| 100 | // $FlowFixMe[incompatible-use] |
| 101 | // $FlowFixMe[method-unbinding] |
| 102 | if (typeof destination.error === 'function') { |
| 103 | // $FlowFixMe[incompatible-type]: This is an Error object or the destination accepts other types. |
| 104 | destination.error(error); |
| 105 | |
| 106 | // $FlowFixMe[incompatible-use] |
| 107 | // $FlowFixMe[method-unbinding] |
| 108 | } else if (typeof destination.destroy === 'function') { |
| 109 | // $FlowFixMe[incompatible-type]: This is an Error object or the destination accepts other types. |
| 110 | destination.destroy(error); |
| 111 | |
| 112 | // $FlowFixMe[incompatible-use] |
| 113 | // $FlowFixMe[method-unbinding] |
| 114 | } else if (typeof destination.close === 'function') { |
| 115 | // Earlier implementations doesn't support this method. In that environment you're |
| 116 | // supposed to throw from a promise returned but we don't return a promise in our |
| 117 | // approach. We could fork this implementation but this is environment is an edge |
| 118 | // case to begin with. It's even less common to run this in an older environment. |
| 119 | // Even then, this is not where errors are supposed to happen and they get reported |
| 120 | // to a global callback in addition to this anyway. So it's fine just to close this. |
| 121 | destination.close(); |
| 122 | } |
| 123 | } |
| 124 | |
| 125 | export function createFastHash(input: string): number { |
| 126 | return Bun.hash(input); |
| 127 | } |
| 128 | |
| 129 | export function readAsDataURL(blob: Blob): Promise<string> { |
| 130 | return blob.arrayBuffer().then(arrayBuffer => { |
| 131 | const encoded = Buffer.from(arrayBuffer).toString('base64'); |
| 132 | const mimeType = blob.type || 'application/octet-stream'; |
| 133 | return 'data:' + mimeType + ';base64,' + encoded; |
| 134 | }); |
| 135 | } |