Detailed example of using typescript to encapsulate axios in Vue3

import axios, { AxiosRequestConfig, AxiosRequestHeaders, AxiosResponse } from 'axios'
import { IResponseData } from '@/types'
import { ElMessage, ElLoading, ILoadingInstance } from 'element-plus'

type TAxiosOption = {
  baseURL: string;
  timeout: number;
}

const config = {
  baseURL: '/',
  timeout: 120000
}

let loading: ILoadingInstance;

class Http {
  //service: AxiosInstance;
  service;
  constructor(config: TAxiosOption) {
    this.service = axios.create(config)

    /* Request interception this.service.interceptors.request.use(config => config, error => Promise.reject(error))*/
    this.service.interceptors.request.use((config: AxiosRequestConfig) => {
      /* Business logic 1. Enable full-screen loading animation 2. Data encryption config.data
      3. Add token to the request header, combined with vuex or localstorage:
          if (store.getters.token) config.headers['x-token'] = store.getters.token
          else redirect 4. …
      */
      loading = ElLoading.service({
        lock: true,
        text: 'Loading',
        spinner: 'el-icon-loading',
        background: 'rgba(255, 255, 255, 0.7)',
      })

      if (localStorage.getItem('token')) {
        (config.headers as AxiosRequestHeaders).authorization = localStorage.getItem('token') as string
      }

      return config
    }, error => {
      /* Request error 1. Close full-screen loading animation 2. Redirect to error page */
      loading.close()
      return Promise.reject(error) // In order to catch the error message in the code})


    /* Response interception this.service.interceptors.response.use(response => response.data, error => Promise.reject(error))*/
    this.service.interceptors.response.use((response: AxiosResponse<any>) => {
      /* 
      1. Close the full-screen loading animation 2. Data decryption 3. Perform different error handling based on response.data.code 4. …
      */
      loading.close()

      const data = response.data
      const { code } = data

      if (code !== '000000') {
        ElMessage.error(data.message)
        return Promise.reject(data)
      }
      return response.data
    }, error => {
      loading.close()
      ElMessage.error('Request failed',)
      return Promise.reject(error)
    })
  }
  get<T>(url: string, params?: object, _object = {}): Promise<IResponseData<T>> {
    return this.service.get(url, { params, ..._object })
  }
  post<T>(url: string, params?: object, _object = {}): Promise<IResponseData<T>> {
    return this.service.post(url, params, _object)
  }
  put<T>(url: string, params?: object, _object = {}): Promise<IResponseData<T>> {
    return this.service.put(url, params, _object)
  }
  delete<T>(url: string, params?: any, _object = {}): Promise<IResponseData<T>> {
    return this.service.delete(url, { params, ..._object })
  }
}

export default new Http(config)

export interface IResponseData<T> {
  status: number;
  message?:string;
  data:T;
  code: string;
}

<template lang="pug">
//- Query form
el-form(:inline="true" :model="queryForm" size="small" label-position="left")
  el-form-item
    el-button(type="primary" @click="operate")
      | Add el-form-item(label="Product Number")
    el-input(v-model="queryForm._id")
  el-form-item(label="Product Name")
    el-input(v-model="queryForm.goodName")
  el-form-item(label="quantity")
    el-input(v-model="queryForm.count")
  el-form-item(label="Details")
    el-input(v-model="queryForm.des")
  el-form-item
    el-button(type="primary" @click="query")
      | Query //- List el-table(:data="list" center size="mini")
  el-table-column(prop="goodName" label="Product Name")
  el-table-column(prop="count" label="quantity")
  el-table-column(prop="des" label="Details")
  el-table-column(label="operation")
    template(#default="props")
      el-button(type="primary" size="small" @click="operate(props.row)")
        | Edit el-button(type="danger" size="small" @click="operate(props.row, true)")
        | Delete //- Add, edit el-drawer(v-model="detailShow" :title="editShow === true ? 'Edit' : 'Add'" direction="rtl")
  el-form(:model="detailForm" size="small" label-width="80px" label-position="left")
    //- el-form-item(label="Product Number" required v-if="false")
    el-form-item(label="Product Number" required v-if="log(editShow)")
      el-input(v-model="detailForm._id" readonly)
    el-form-item(label="Product Name" required) 
      el-input(v-model="detailForm.goodName")
    el-form-item(label="quantity")
      el-input(v-model="detailForm.count")
    el-form-item(label="Details")
      el-input(v-model="detailForm.des")
    el-form-item
      el-button(type="primary" size="small" @click="submit")
        | OK</template>

<script lang="ts">
import { defineComponent, reactive, ref } from 'vue';
import { ElMessage } from 'element-plus'
import { IGoodInfo, IList } from '@/types/goods'
import http from '@/http'

export default defineComponent({
  name: 'Home',
  setup() {
    const list = ref<IGoodInfo[]>([])

    const queryForm = ref({ goodName: '', count: '', _id: '', des: '' })
    const detailForm = ref({ goodName: '', count: '', _id: '', des: '' })
    const detailShow = ref(false)
    const editShow = ref(false)

    query()


   	async function query() {
      const { data } = await http.get<IList>('/goods/list', queryForm.value)
      list.value = data.list
    }

    async function operate(form?: IGoodInfo, flag?: true) {
      if (!form) {
        detailShow.value = true
        editShow.value = false
        detailForm.value = { goodName: '', count: '', _id: '', des: '' }
      } else if (!flag) {
        detailShow.value = true
        editShow.value = true
        detailForm.value = { ...form }
      } else {
        await http.delete('/goods/delete', { _id: form._id })
        query()
      }
    }

    async function submit() {
      if (detailForm.value._id) {
        await http.put('/goods/edit', detailForm.value)
      }else{
        await http.put('/goods/edit', detailForm.value)
      }

      detailShow.value = false
      ElMessage({
        message: 'Operation successful',
        type: 'success',
      })
      query()
    }


    function log(params:any) {
     console.log(params);
     return params
    }

    return {
      detailShow,
      editShow,
      list,
      queryForm,
      detailForm,
      query,
      operate,
      submit,
      log
    }
  }
});
</script>

export interface IGoodInfo {
  _id: string;
  goodName: string;
  count: string;
  des: string
}

export interface IList {
  list: IGoodInfo[]
}