Function start

packages/server-renderer/src/renderToStream.ts:161–175

(controller)

  return new ReadableStream({
    start(controller) {
      renderToSimpleStream(input, context, {
        push(content) {
          if (cancelled) return
          if (content != null) {
            controller.enqueue(encoder.encode(content))
          } else {
            controller.close()
          }
        },
        destroy(err) {
          controller.error(err)
        },
      })
    },
    cancel() {
      cancelled = true
    },