githubmirror/json-server

src/observer.ts

36 строк634 B

typicode

feat: better cli output

07 янв 2024, 04:17

07 янв 2024, 04:17ac42825

import { Adapter } from 'lowdb'

// Lowdb adapter to observe read/write events
export class Observer<T> {
  #adapter

  onReadStart = function () {
    return
  }
  onReadEnd: (data: T | null) => void = function () {
    return
  }
  onWriteStart = function () {
    return
  }
  onWriteEnd = function () {
    return
  }

  constructor(adapter: Adapter<T>) {
    this.#adapter = adapter
  }

  async read() {
    this.onReadStart()
    const data = await this.#adapter.read()
    this.onReadEnd(data)
    return data
  }

  async write(arg: T) {
    this.onWriteStart()
    await this.#adapter.write(arg)
    this.onWriteEnd()
  }
}