Function loadConfig

packages/next/src/server/config.ts:1543–1910

(
  phase: PHASE_TYPE,
  dir: string,
  {
    customConfig,
    rawConfig,
    silent = true,
    reportExperimentalFeatures,
    reactProductionProfiling,
    debugPrerender,
    bundler,
  }: LoadConfigOptions = {}
)

): Promise<NextConfigComplete>

export default async function loadConfig(
  phase: PHASE_TYPE,
  dir: string,
  {
    customConfig,
    rawConfig,
    silent = true,
    reportExperimentalFeatures,
    reactProductionProfiling,
    debugPrerender,
    bundler,
  }: LoadConfigOptions = {}
): Promise<NextConfigComplete> {
  // Generate cache key based on parameters that affect config output
  // Include process.pid to invalidate cache on server restart
  const cacheKey = getCacheKey(
    phase,
    dir,
    customConfig,
    reactProductionProfiling,
    debugPrerender,
    process.pid
  )

  // Check if we have a cached result
  const cachedResult = configCache.get(cacheKey)
  if (cachedResult) {
    // Call the experimental features callback if provided
    if (reportExperimentalFeatures) {
      reportExperimentalFeatures(cachedResult.configuredExperimentalFeatures)
    }

    // Return raw config if requested and available
    if (rawConfig && cachedResult.rawConfig) {
      return cachedResult.rawConfig
    }

    return cachedResult.config
  } else {
    // Reset next.config errors before loading config
    // This happens on every config load to ensure fresh validation
    NextInstanceErrorState.nextConfig = []
  }

  // Original implementation continues below...
  if (!process.env.__NEXT_PRIVATE_RENDER_WORKER) {
    try {
      loadWebpackHook()
    } catch (err) {
      // this can fail in standalone mode as the files
      // aren't traced/included
      if (!process.env.__NEXT_PRIVATE_STANDALONE_CONFIG) {
        throw err
      }
    }
  }

  if (process.env.__NEXT_PRIVATE_STANDALONE_CONFIG) {