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
import type {Chunk} from './chunk';import type {ReadonlyJSONValue} from '../mod';import type {Hash} from '../hash';
export interface Store {  read(): Promise<Read>;  withRead<R>(fn: (read: Read) => R | Promise<R>): Promise<R>;  write(): Promise<Write>;  withWrite<R>(fn: (Write: Write) => R | Promise<R>): Promise<R>;  close(): Promise<void>;}
interface GetChunk {  getChunk(hash: Hash): Promise<Chunk | undefined>;}
export interface Read extends GetChunk {  hasChunk(hash: Hash): Promise<boolean>;  mustGetChunk(hash: Hash): Promise<Chunk>;  getHead(name: string): Promise<Hash | undefined>;  close(): void;  get closed(): boolean;}
export interface Write extends Read {  createChunk<V extends ReadonlyJSONValue>(    data: V,    refs: readonly Hash[],  ): Chunk<V>;  putChunk(c: Chunk): Promise<void>;  setHead(name: string, hash: Hash): Promise<void>;  removeHead(name: string): Promise<void>;  assertValidHash(hash: Hash): void;  commit(): Promise<void>;}
export class ChunkNotFoundError extends Error {  name = 'ChunkNotFoundError';  readonly hash: Hash;  constructor(hash: Hash) {    super(`Chunk not found ${hash}`);    this.hash = hash;  }}
export async function mustGetChunk(  store: GetChunk,  hash: Hash,): Promise<Chunk> {  const chunk = await store.getChunk(hash);  if (chunk) {    return chunk;  }  throw new ChunkNotFoundError(hash);}