loadCachedDepOptimizationMetadata() — vite Function Reference

Source Code

packages/vite/src/node/optimizer/index.ts lines 382–445

export async function loadCachedDepOptimizationMetadata(
  environment: Environment,
  force: boolean = environment.config.optimizeDeps.force ?? false,
  asCommand = false,
): Promise<DepOptimizationMetadata | undefined> {
  const log = asCommand ? environment.logger.info : debug

  if (firstLoadCachedDepOptimizationMetadata) {
    firstLoadCachedDepOptimizationMetadata = false
    // Fire up a clean up of stale processing deps dirs if older process exited early
    setTimeout(
      () => cleanupDepsCacheStaleDirs(environment.getTopLevelConfig()),
      0,
    ).unref()
  }

  const depsCacheDir = getDepsCacheDir(environment)

  if (!force) {
    let cachedMetadata: DepOptimizationMetadata | undefined
    try {
      const cachedMetadataPath = path.join(depsCacheDir, METADATA_FILENAME)
      cachedMetadata = parseDepsOptimizerMetadata(
        await fsp.readFile(cachedMetadataPath, 'utf-8'),
        depsCacheDir,
      )
    } catch {}
    // hash is consistent, no need to re-bundle
    if (cachedMetadata) {
      if (cachedMetadata.lockfileHash !== getLockfileHash(environment)) {
        environment.logger.info(
          'Re-optimizing dependencies because lockfile has changed',
          {
            timestamp: true,
          },
        )
      } else if (cachedMetadata.configHash !== getConfigHash(environment)) {
        environment.logger.info(
          'Re-optimizing dependencies because vite config has changed',
          {
            timestamp: true,
          },
        )
      } else {
        log?.(
          `(${environment.name}) Hash is consistent. Skipping. Use --force to override.`,
        )
        // Nothing to commit or cancel as we are using the cache, we only
        // need to resolve the processing promise so requests can move on
        return cachedMetadata
      }
    }
  } else {
    environment.logger.info('Forced re-optimization of dependencies', {
      timestamp: true,
    })
  }

  // Start with a fresh cache
  debug?.(
    `(${environment.name}) ${colors.green(`removing old cache dir ${depsCacheDir}`)}`,
  )
  await fsp.rm(depsCacheDir, { recursive: true, force: true })
}