Method shard

packages/vitest/src/node/sequencers/BaseSequencer.ts:16–32

(files: TestSpecification[])

  // async so it can be extended by other sequencers
  public async shard(files: TestSpecification[]): Promise<TestSpecification[]> {
    const { config } = this.ctx
    const { index, count } = config.shard!
    const [shardStart, shardEnd] = this.calculateShardRange(files.length, index, count)
    return [...files]
      .map((spec) => {
        const fullPath = resolve(slash(config.root), slash(spec.moduleId))
        const specPath = fullPath?.slice(config.root.length)
        return {
          spec,
          hash: hash('sha1', specPath, 'hex'),
        }
      })
      .sort((a, b) => (a.hash < b.hash ? -1 : a.hash > b.hash ? 1 : 0))
      .slice(shardStart, shardEnd)
      .map(({ spec }) => spec)
  }

  // async so it can be extended by other sequencers
  public async sort(files: TestSpecification[]): Promise<TestSpecification[]> {