Class Span

packages/next/src/client/tracing/tracer.ts:26–57

}

class Span implements ISpan {
  name: string
  startTime: number
  onSpanEnd: (span: Span) => void
  state: SpanState
  attributes: Record<string, unknown>

  constructor(
    name: string,
    options: SpanOptions,
    onSpanEnd: (span: Span) => void
  ) {
    this.name = name
    this.attributes = options.attributes ?? {}
    this.startTime = options.startTime ?? Date.now()
    this.onSpanEnd = onSpanEnd
    this.state = { state: 'inprogress' }
  }

  end(endTime?: number) {
    if (this.state.state === 'ended') {
      throw new Error('Span has already ended')
    }

    this.state = {
      state: 'ended',
      endTime: endTime ?? Date.now(),
    }

    this.onSpanEnd(this)
  }
}

class Tracer {
  _emitter: MittEmitter<string> = mitt()