| 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 | // A chunk is either a plain chunk filename, or a merged chunk that bundles |
| 11 | // several component chunks together, emitted as |
| 12 | // `[mergedChunkFilename, componentChunkFilenames, componentChunkSizes]`. |
| 13 | export type Chunk = |
| 14 | | string |
| 15 | | [ |
| 16 | /* merged chunk filename */ string, |
| 17 | /* component chunk filenames */ Array<string>, |
| 18 | /* component chunk sizes */ Array<number>, |
| 19 | ]; |
| 20 | |
| 21 | export type ImportManifestEntry = { |
| 22 | id: string, |
| 23 | chunks: Array<Chunk>, |
| 24 | name: string, |
| 25 | async?: boolean, |
| 26 | }; |
| 27 | |
| 28 | // This is the parsed shape of the wire format which is why it is |
| 29 | // condensed to only the essentialy information |
| 30 | export type ImportMetadata = |
| 31 | | [ |
| 32 | /* id */ string, |
| 33 | /* chunks */ Array<Chunk>, |
| 34 | /* name */ string, |
| 35 | /* async */ 1, |
| 36 | ] |
| 37 | | [/* id */ string, /* chunks */ Array<Chunk>, /* name */ string]; |
| 38 | |
| 39 | export const ID = 0; |
| 40 | export const CHUNKS = 1; |
| 41 | export const NAME = 2; |
| 42 | // export const ASYNC = 3; |
| 43 | |
| 44 | // This logic is correct because currently only include the 4th tuple member |
| 45 | // when the module is async. If that changes we will need to actually assert |
| 46 | // the value is true. We don't index into the 4th slot because flow does not |
| 47 | // like the potential out of bounds access |
| 48 | export function isAsyncImport(metadata: ImportMetadata): boolean { |
| 49 | return metadata.length === 4; |
| 50 | } |