Function readBlobs

packages/vitest/src/node/reporters/blob.ts:112–212

(
  currentVersion: string,
  blobsDirectory: string,
  projectsArray: TestProject[],
)

}

export async function readBlobs(
  currentVersion: string,
  blobsDirectory: string,
  projectsArray: TestProject[],
): Promise<MergedBlobs> {
  // using process.cwd() because --merge-reports can only be used in CLI
  const resolvedDir = resolve(process.cwd(), blobsDirectory)
  const blobsFiles = await readdir(resolvedDir)
  const promises = blobsFiles.map(async (filename) => {
    const fullPath = resolve(resolvedDir, filename)
    const stats = await stat(fullPath)
    if (!stats.isFile()) {
      throw new TypeError(
        `vitest.mergeReports() expects all paths in "${blobsDirectory}" to be files generated by the blob reporter, but "${filename}" is not a file`,
      )
    }
    const content = await readFile(fullPath, 'utf-8')
    const [version, files, errors, coverage, executionTime, environmentModules] = parse(
      content,
    ) as MergeReport
    if (!version) {
      throw new TypeError(
        `vitest.mergeReports() expects all paths in "${blobsDirectory}" to be files generated by the blob reporter, but "${filename}" is not a valid blob file`,
      )
    }
    return { version, files, errors, coverage, file: filename, executionTime, environmentModules }
  })
  const blobs = await Promise.all(promises)

  if (!blobs.length) {
    throw new Error(
      `vitest.mergeReports() requires at least one blob file in "${blobsDirectory}" directory, but none were found`,
    )
  }

  const versions = new Set(blobs.map(blob => blob.version))
  if (versions.size > 1) {
    throw new Error(
      `vitest.mergeReports() requires all blob files to be generated by the same Vitest version, received\n\n${blobs.map(b => `- "${b.file}" uses v${b.version}`).join('\n')}`,
    )
  }

  if (!versions.has(currentVersion)) {
    throw new Error(
      `the blobs in "${blobsDirectory}" were generated by a different version of Vitest. Expected v${currentVersion}, but received v${blobs[0].version}`,
    )
  }

  // Restore module graph
  const projects = Object.fromEntries(
    projectsArray.map(p => [p.name, p]),
  )

  for (const project of projectsArray) {
    if (project.isBrowserEnabled()) {
      await project._initBrowserServer()
    }
  }