Vue3 源码头脑风暴之 9 ☞ server-renderer

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export function createBuffer() {
  let appendable = false
  const buffer: SSRBuffer = []

  return {
    getBuffer(): SSRBuffer {
      // Return static buffer and await on items during unroll stage
      return buffer
    },
    push(item: SSRBufferItem) {
      const isStringItem = isString(item)
      if (appendable && isStringItem) {
        buffer[buffer.length - 1] += item as string
      } else {
        buffer.push(item)
      }
      appendable = isStringItem

      if (isPromise(item) || (isArray(item) && item.hasAsync)) {
        // promise, or child buffer with async, mark as async.
        // this allows skipping unnecessary await ticks during unroll stage
        // 标记为异步 buffer
        buffer.hasAsync = true
      }
    }
  }
}