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import * as db from '../db/mod';import {Hash, isTempHash} from '../hash';import type * as dag from '../dag/mod';import type * as btree from '../btree/mod';import type {HashRefType} from '../db/hash-ref-type';import type {Meta} from '../db/commit';
export class GatherVisitor extends db.Visitor {  private readonly _gatheredChunks: Map<Hash, dag.Chunk> = new Map();
  get gatheredChunks(): ReadonlyMap<Hash, dag.Chunk> {    return this._gatheredChunks;  }
  override async visitCommit(    h: Hash,    hashRefType?: HashRefType,  ): Promise<void> {    if (!isTempHash(h)) {      // Not a temp hash, no need to visit anything else.      return;    }    return super.visitCommit(h, hashRefType);  }
  override async visitCommitChunk(    chunk: dag.Chunk<db.CommitData<Meta>>,  ): Promise<void> {    this._gatheredChunks.set(chunk.hash, chunk);    return super.visitCommitChunk(chunk);  }
  override async visitBTreeNode(h: Hash): Promise<void> {    if (!isTempHash(h)) {      // Not a temp hash, no need to visit anything else.      return;    }
    return super.visitBTreeNode(h);  }
  override async visitBTreeNodeChunk(    chunk: dag.Chunk<btree.Node>,  ): Promise<void> {    this._gatheredChunks.set(chunk.hash, chunk);    return super.visitBTreeNodeChunk(chunk);  }}