Function getOrCreateStream

packages/router-core/tests/RawStream.test.ts:132–139

(id: number)

      // getOrCreateStream function that returns from map
      const getOrCreateStream = (id: number) => {
        let stream = streams.get(id)
        if (!stream) {
          stream = new ReadableStream<Uint8Array>()
          streams.set(id, stream)
        }
        return stream
      }

      const plugin = createRawStreamDeserializePlugin(getOrCreateStream)