Function tryOptimizedResolve

packages/vite/src/node/plugins/resolve.ts:851–904

(
  depsOptimizer: DepsOptimizer,
  id: string,
  importer?: string,
  preserveSymlinks?: boolean,
  packageCache?: PackageCache,
)

}

export async function tryOptimizedResolve(
  depsOptimizer: DepsOptimizer,
  id: string,
  importer?: string,
  preserveSymlinks?: boolean,
  packageCache?: PackageCache,
): Promise<string | undefined> {
  // TODO: we need to wait until scanning is done here as this function
  // is used in the preAliasPlugin to decide if an aliased dep is optimized,
  // and avoid replacing the bare import with the resolved path.
  // We should be able to remove this in the future
  await depsOptimizer.scanProcessing

  const metadata = depsOptimizer.metadata

  const depInfo = optimizedDepInfoFromId(metadata, id)
  if (depInfo) {
    return depsOptimizer.getOptimizedDepId(depInfo)
  }

  if (!importer) return

  // further check if id is imported by nested dependency
  let idPkgDir: string | undefined
  const nestedIdMatch = `> ${id}`

  for (const optimizedData of metadata.depInfoList) {
    if (!optimizedData.src) continue // Ignore chunks

    // check where "foo" is nested in "my-lib > foo"
    if (!optimizedData.id.endsWith(nestedIdMatch)) continue

    // lazily initialize idPkgDir
    if (idPkgDir == null) {
      const pkgName = getNpmPackageName(id)
      if (!pkgName) break
      idPkgDir = resolvePackageData(
        pkgName,
        importer,
        preserveSymlinks,
        packageCache,
      )?.dir
      // if still null, it likely means that this id isn't a dep for importer.
      // break to bail early
      if (idPkgDir == null) break
      idPkgDir = normalizePath(idPkgDir)
    }

    // match by src to correctly identify if id belongs to nested dependency
    if (optimizedData.src.startsWith(withTrailingSlash(idPkgDir))) {
      return depsOptimizer.getOptimizedDepId(optimizedData)
    }
  }
}

export function resolvePackageEntry(
  id: string,