typescript source code of http.service

import { Injectable } from '@nestjs/common';
import { Inject } from '@nestjs/common';
import Axios ,{ AxiosInstance } from 'axios';
import { AXIOS_INSTANCE_TOKEN } from "./http.constants";

@Injectable()
export class HttpService {
    public readonly put: typeof Axios.put;
    public readonly post: typeof Axios.post;
    public readonly patch: typeof Axios.patch;
    public readonly head: typeof Axios.patch;
    public readonly delete: typeof Axios.delete;
    public readonly get: typeof Axios.get;
    public readonly request: typeof Axios.request;

    constructor(
        @Inject(AXIOS_INSTANCE_TOKEN)
        private readonly instance: AxiosInstance = Axios,
    ) {
        this.put = this.instance.put;
        this.post = this.instance.post;
        this.patch = this.instance.patch;
        this.head = this.instance.head;
        this.head = this.instance.head;
        this.delete = this.instance.delete;
        this.get = this.instance.get;
        this.request = this.instance.request;
    }

    get axiosRef(): AxiosInstance {
        return this.instance
    }
}