Nodejs AssertionError [ERR_ASSERTION]: You must specify the endpoint url when invoking this module

[armanriazi]

Expected Behavior

AssertionError [ERR_ASSERTION]: You must specify the endpoint url when invoking this module
I am suggesting event emitter maybe. I need away for converting dburl() to dburl object

Current Behavior

I used couchdb and I was wondering If you could help me about differential between

require("nano")(require("../startup/environment").dburl) <=with=>
require("nano")(require("../startup/environment").dburl())

It is ok when I set process.env.DB_ADDRESS on line of this code(Bookmark:/)

    const winston = require("winston");
    const fs = require("fs");
    const result = require("dotenv").config();
    
    if (result.error) {
      throw result.error;
    }
    winston.info(result.parsed);
    
    const doSelectEnv = () => {
      switch (process.env.NODE_ENV) {
        case "development":
          const envConfigDev = require("dotenv").parse(
            fs.readFileSync(".env.override.development")
          );
          for (const k in envConfigDev) {
            process.env[k] = envConfigDev[k];
            winston.info(process.env[k]);
          }
          break;
        case "production":
          const envConfigPro = require("dotenv").parse(
            fs.readFileSync(".env.override.production")
          );
          for (const k in envConfigPro) {
            //Bookmark **********\/********** if("DB_ADDRESS" == k)  {
            //  console.log(url);
            // }
            process.env[k] = envConfigPro[k];
            winston.info(process.env[k]);
          }
          break;
        case "stage":
          const envConfigStage = require("dotenv").parse(
            fs.readFileSync(".env.override.stage")
          );
          for (const k in envConfigStage) {
            process.env[k] = envConfigStage[k];
            winston.info(process.env[k]);
          }
          break;
      }
    };
    exports.doSelectEnv = doSelectEnv;
    exports.dburl =  "http://dbadmin:server@192.168.1.11:5984"; // process.env.DB_ADDRESS

If I use dburl object it will execute (user.js consume dburl)

  const db = require("nano")(require("../startup/environment").dburl).use(
     "dbvidly"
   );

Steps to Reproduce (for bugs)

But I need this code because of DB_ADDRESS

exports.dburl = ()=> {return process.env.DB_ADDRESS);

when I used this code then rising ERR_ASSERTION

    const db = require("nano")(require("../startup/environment").dburl()).use(
          "dbvidly"
        );

AssertionError [ERR_ASSERTION]: You must specify the endpoint url when invoking this module

Your Environment

• Version nodejs: 8.11.1 on container
• executed by nodemon

[armanriazi]

I answered it on link of my medium:

https://medium.com/@arman.riazi.science/let-me-show-you-error-on-stackoverflow-c83af0d0c8a7