chatworkAPIでメッセージを送信します。（ES6 / Google Apps Script）

index.js

import rooms from './rooms'

const room_id = [room id]; //https://www.chatwork.com/#!rid[room id]
const token   = "[chatwork api token]";

global.messages = function () {
    let cw = new rooms(room_id, token);
    let body = "test";
    cw.messages(body);
}

rooms.js

export default class rooms{
    constructor(room_id, token){
        this.domain   = "https://api.chatwork.com";
        this.endpoint = "/rooms/{room_id}";
        this.version  = 2;
        this.apiurl   = "";
        this.header = [];
        
        let apiurl  = this.domain + "/v" + this.version + this.endpoint;
        this.apiurl = apiurl.replace(/{room_id}/, room_id);
        this.header = {"X-ChatWorkToken" : token};
    }
    
    messages(body){
        let apiurl = this.apiurl + "/messages";
        let post_data = {
            'body' : body
        };
        
        var options = {
           "headers" : this.header,
           "method"  : "post",
           "payload" : post_data,
           "muteHttpExceptions" : true
        };
        
        let res = UrlFetchApp.fetch(apiurl, options);
        let txt = res.getContentText();
    }
}