A queue

Queue.ts

type QueueItem = () => Promise<void>

export class Queue {
  private items: QueueItem[] = []

  private running: boolean = false

  public add = (item: QueueItem): void => {
    this.items.push(item)

    if (!this.running) {
      this.run()
    }
  }

  private run = (): void => {
    this.running = true

    const item = this.items.shift()

    if (item) {
      item().finally(this.run)
    } else {
      this.running = false
    }
  }
}

Usage:

const queue = new Queue()

const request = <T extends any>(config: AxiosRequestConfig) => {
  return new Promise<AxiosResponse<T>>((resolve, reject) => {
    queue.add(() => axios.request<T>(config).then(resolve, reject))
  })
}

request({  url: 'https://example.com' }).then(response => console.log(response.data))