Function getCacheKey

packages/next/src/server/config.ts:1493–1513

(
  phase: PHASE_TYPE,
  dir: string,
  customConfig?: object | null,
  reactProductionProfiling?: boolean,
  debugPrerender?: boolean,
  pid?: number
)

// Generate cache key based on parameters that affect config output
// We need a unique key for cache because there can be multiple values
function getCacheKey(
  phase: PHASE_TYPE,
  dir: string,
  customConfig?: object | null,
  reactProductionProfiling?: boolean,
  debugPrerender?: boolean,
  pid?: number
): string {
  // The next.config.js is unique per project, so we can use the dir as the major key
  // to generate the unique config key. Include PID to invalidate on server restart.
  const keyData = JSON.stringify({
    dir,
    phase,
    hasCustomConfig: Boolean(customConfig),
    reactProductionProfiling: Boolean(reactProductionProfiling),
    debugPrerender: Boolean(debugPrerender),
    pid: pid || 0,
  })

  return djb2Hash(keyData).toString(36)
}

type LoadConfigOptions = {
  customConfig?: object | null