Function getTransformFn

packages/start-server-core/src/createStartHandler.ts:378–394

(
    opts: { warmup: true } | { warmup: false; request: Request },
  )

  let cachedCreateTransformPromise: Promise<TransformAssetUrlsFn> | undefined

  const getTransformFn = async (
    opts: { warmup: true } | { warmup: false; request: Request },
  ): Promise<TransformAssetUrlsFn | undefined> => {
    if (!resolvedTransformConfig) return undefined
    if (resolvedTransformConfig.type === 'createTransform') {
      if (cache) {
        if (!cachedCreateTransformPromise) {
          cachedCreateTransformPromise = Promise.resolve(
            resolvedTransformConfig.createTransform(opts),
          )
        }
        return cachedCreateTransformPromise
      }
      return resolvedTransformConfig.createTransform(opts)
    }
    return resolvedTransformConfig.transformFn
  }

  // Background warmup for cached transforms (production only)
  if (