Develop Reference

How to use node_modules in Deno as typescript imports?

Project: REST API for serving information stored in a neo4j graph database.
Backend: Deno
I am farely new to deno, but I'm not new to typescript, having used it in Angular frequently.
Problem: I want to use a driver to connect my neo4j database to my backend, but there is no neo4j driver made for Deno. I have scoured the internet and documentation for solutions, and have been trying to import the javascript library using the node modules import tool that has been suggested from similar answers and is supported by the deno team.
Essentially, I do npm install neo4j-driver, and then add the following code to my deno project.
Failed Solution: the javascript node modules wrapper
I implement call this function as a test for my deno server in a server.ts file.
The command I use for deno is: deno run --allow-all --unstable server.ts
neo4j_conn.ts file: (called by server.ts)
import { createRequire } from "https://deno.land/std/node/module.ts";
const require = createRequire(import.meta.url);
export async function testconnection(uri: string, user: string, password: string) {
//This is the line that fails.
var neo4j = require('neo4j-driver').v1; //this fails whether or not I include the .v1 or not.
var driver = neo4j.driver(uri, neo4j.auth.basic(user, password))
const session = driver.session()
const personName = 'Alice'
try {
const result = await session.run(
'CREATE (a:Person {name: $name}) RETURN a',
{ name: personName }
)
const singleRecord = result.records[0]
const node = singleRecord.get(0)
console.log(node.properties.name)
} finally {
await session.close()
}
await driver.close()
}
This returns the following error:
error: Uncaught (in promise) Error: Cannot find module 'net'
Require stack:
- /mnt/c/Users/xxxxx/source/private_logic/deno-try/node_modules/neo4j-driver-bolt-connection/lib/channel/node/node-channel.js
- /mnt/c/Users/xxxxx/source/private_logic/deno-try/node_modules/neo4j-driver-bolt-connection/lib/channel/node/index.js
- /mnt/c/Users/xxxxx/source/private_logic/deno-try/node_modules/neo4j-driver-bolt-connection/lib/channel/index.js
- /mnt/c/Users/xxxxx/source/private_logic/deno-try/node_modules/neo4j-driver-bolt-connection/lib/bolt/handshake.js
- /mnt/c/Users/xxxxx/source/private_logic/deno-try/node_modules/neo4j-driver-bolt-connection/lib/bolt/index.js
- /mnt/c/Users/xxxxx/source/private_logic/deno-try/node_modules/neo4j-driver-bolt-connection/lib/index.js
- /mnt/c/Users/xxxxx/source/private_logic/deno-try/node_modules/neo4j-driver/lib/index.js
- /mnt/c/Users/xxxxx/source/private_logic/deno-try/neo4jconn.ts
at Function._resolveFilename (https://deno.land/std#0.97.0/node/module.ts:273:19)
at Function._load (https://deno.land/std#0.97.0/node/module.ts:380:29)
at Module.require (https://deno.land/std#0.97.0/node/module.ts:133:21)
at require (https://deno.land/std#0.97.0/node/module.ts:1158:16)
at Object.<anonymous> (file:///mnt/c/Users/xxxxx/source/private_logic/deno-try/node_modules/neo4j-driver-bolt-connection/lib/channel/node/node-channel.js:24:29)
at Module._compile (https://deno.land/std#0.97.0/node/module.ts:168:36)
at Object.Module._extensions..js (https://deno.land/std#0.97.0/node/module.ts:1109:10)
at Module.load (https://deno.land/std#0.97.0/node/module.ts:147:34)
at Function._load (https://deno.land/std#0.97.0/node/module.ts:413:14)
at Module.require (https://deno.land/std#0.97.0/node/module.ts:133:21)
As far as I could tell, I had done everything right, but I am a little in over my head when it comes to the typescript/js module translation.
My file structure is as follows:
package.json
package-lock.json
server.ts
neo4j_conn.ts
node_modules -|
|
:
Neo4j developer js docs: https://neo4j.com/developer/javascript/
Deno node modules "require": https://doc.deno.land/https/deno.land/std#0.97.0/node/module.ts

If you look at the Node compatibility layer README in std you will realize that right now there is no compatibility module for the net library. The compatibility will improve day by day, but take into account that Deno is not a drop in replacement for Node, but a whole new thing that won't work with Node libraries by default
https://deno.land/std#0.97.0/node

Error: A dynamic link library (DLL) initialization routine failed on electron but it's fine on node js

I'm trying to load a custom module in electron written in D with node_dlang package, which is fine with node, but it fails within electron.
the test with node, that runs just fine, goes like this:
const nativeModule = require('./module.node');
const assert = require('assert');
assert(nativeModule != null);
assert(nativeModule.ultimate() == 42);
But when I went to use it within electron.js, through the preload script, it returns in an error.
the preload script goes like this:
const {
contextBridge,
ipcRenderer
} = require("electron");
const nativeModule = require('./module.node');
const assert = require('assert');
assert(nativeModule.ultimate() == 42);
function pageLoaded()
{
// ...
}
window.addEventListener('DOMContentLoaded', pageLoaded);
the error when I attempt to load the module within electron application is:
A JavaScript error occured in the browser process
--------------------------- Uncaught Exception: Error: A dynamic link library (DLL) initialization routine failed.
\\?\C:\Users\001\Desktop\ele\module.node
at process.func [as dlopen] (VM70 asar_bundle.js:5)
at Object.Module._extensions..node (VM43 loader.js:1138)
at Object.func [as .node] (VM70 asar_bundle.js:5)
at Module.load (VM43 loader.js:935)
at Module._load (VM43 loader.js:776)
at Function.f._load (VM70 asar_bundle.js:5)
at Function.o._load (VM75 renderer_init.js:33)
at Module.require (VM43 loader.js:959)
at require (VM50 helpers.js:88)
at Object.<anonymous> (VM88 C:\Users\001\Desktop\ele\preload.js:6)
What's causing this and how do I fix this?
version
node version is: v14.17.0
electron.js: v13.1.1
both are 64-bit.
the module source code goes like this:
import std.stdio : stderr;
import node_dlang;
extern(C):
void atStart(napi_env env)
{
import std.stdio;
writeln ("Hello from D!");
}
int ultimate()
{
return 42;
}
mixin exportToJs! (ultimate, MainFunction!atStart);
it's compiled with dub command line. No arguments.
UPDATE 1 Do I need to rebuild this module? I found this but it didn't work for me either. I installed the electron-rebuild package by npm install --save-dev electron-rebuild and rebuild with .\node_modules\.bin\electron-rebuild.cmd -v 13.1.1 the command ran fine but I still got same error.
UPDATE 2: inside the console, I clicked in the javascript source code file link in the error message (from the exception) it points to this line of code, where there's this comment saying that:
no static exports found
what does that mean? is this related to the methods in D class? they're marked as public... not sure if related

Electron is a Windows-Application and therefore you need to remove output to std. Try to remove
import std.stdio : stderr;
and
import std.stdio;
writeln ("Hello from D!");
and retry import to Electron.

Please refer this (https://stackoverflow.com/a/74280836/9558119) post from me regarding same. Since it is electron build might be missing Visual C++ Build Environment: Visual Studio Build Tools

Electron: Uncaught Error: Cannot find module

I'm building my first electron desktop app and I'm getting a "cannot find module" error when I use require() in one file to import the other. Both files are in the same folder and there's no misspelling..
Here's the main file index.js
const app = require('electron')
const store = require('./datacontainer') //Here I import the other file
if(store.users.length==0) { // throws exception: store is not defined
...
}
and below is the imported file datacontainer.js
var exp = module.exports = {};
exp.users = [{user1},{user2},...];
...
However, when I run the app and look at the console, it throws the following exeption;
Uncaught Error: Cannot find module './datacontainer'
at Module._resolveFilename (module.js:543)
at Function.Module._resolveFilename (C:\mm_apps\report-viewer\node_modules\electron\dist\resources\electron.asar\common\reset-search-paths.js:35)
at Function.Module._load (module.js:473)
at Module.require (module.js:586)
at require (internal/module.js:11)
at index.js:10
What am I doing wrong or missing?
UPDATES:
In the index.html where the index.js is used, the error goes away if I reference the script like the following
<script>
require('./scripts/index')
</script>
but throws above error when referenced this way
<script src="./scripts/index.js"></script>
what gives?

When you do
<script src="./scripts/index.js"></script>
it looks for the file on the server.
Something like:
https://www.example.com/your-web-folder/scripts/index.js
Using Node.js's require resolves it according to the folder structure of your project.

twilio error 'username required'

var express = require('express');
var router = express.Router();
var bodyParser = require('body-parser');
var nodemailer = require('nodemailer');
var TWILIO_TOKEN = "270ff32fe16828869dc30e0c6926fa9e";
var client = require('twilio')(process.env.AC55a59221acb23a5aa6f046740bb73317, process.env.TWILIO_TOKEN);
router.use(bodyParser.urlencoded({extended: true}));
router.use(bodyParser.json());
router.post('/', function(req, res) {
console.log('this is the req', req.body);
client.messages.creat({
to:'+19522209630',
from:'+17633249718',
body:'hello World'
}, function(err, data) {
if (err) {
console.log('err', err);
console.log('data', data);
}
});//en d of sendMessage
res.send(200);
});
module.exports = router;
/Users/moisesmiguelhernandez/Documents/prime/solo_project/node_modules/twilio/lib/rest/Twilio.js:101
throw new Error('username is required');
^
Error: username is required
at new Twilio (/Users/moisesmiguelhernandez/Documents/prime/solo_project/node_modules/twilio/lib/rest/Twilio.js:101:11)
at initializer (/Users/moisesmiguelhernandez/Documents/prime/solo_project/node_modules/twilio/lib/index.js:8:10)
at Object.<anonymous> (/Users/moisesmiguelhernandez/Documents/prime/solo_project/routes/sendMessage.js:6:31)
at Module._compile (module.js:569:30)
at Object.Module._extensions..js (module.js:580:10)
at Module.load (module.js:503:32)
at tryModuleLoad (module.js:466:12)
at Function.Module._load (module.js:458:3)
at Module.require (module.js:513:17)
at require (internal/module.js:11:18)
at Object.<anonymous> (/Users/moisesmiguelhernandez/Documents/prime/solo_project/server.js:10:19)
at Module._compile (module.js:569:30)
at Object.Module._extensions..js (module.js:580:10)
at Module.load (module.js:503:32)
at tryModuleLoad (module.js:466:12)
at Function.Module._load (module.js:458:3)
npm ERR! code ELIFECYCLE
npm ERR! errno 1
npm ERR! solo_project#1.0.0 start: `node server.js`
npm ERR! Exit status 1
npm ERR!
npm ERR! Failed at the solo_project#1.0.0 start script.
npm ERR! This is probably not a problem with npm. There is likely additional logging output above.
npm ERR! A complete log of this run can be found in:
npm ERR! /Users/moisesmiguelhernandez/.npm/_logs/2017-07-11T15_02_02_750Z-debug.log
I am getting and error that says username is required. I am trying to use twilio. I followed a youtube video and i have it like he does. Any suggestions on how to fix this? P.S The index file is the terminal error message

Save these into a .env file at your root of your folder
TWILIO_TOKEN = "270ff32fe16828869dc30e0c6926fa9e"
TWILIO_ACCOUNT_SID = "AC55a59221acb23a5aa6f046740bb73317"
Then install
npm install dotenv --save
After that you can use these environment variables in your file like this:
require('dotenv');
var client = require('twilio')(process.env.TWILIO_ACCOUNT_SID, process.env.TWILIO_TOKEN);```

I had this same issue as well. What fixed it for me is doing
npm install dotenv
require('dotenv').config()
then I added my
TWILIO_ACCOUNT_SID=***
TWILIO_AUTH_TOKEN=***
full code:
require('dotenv').config();
const accountSid = process.env.ACCOUNT_SID;
const authToken = process.env.AUTH_TOKEN;
const client = require('twilio')(accountSid, authToken);
client.calls
.create({
url: 'http://demo.twilio.com/docs/voice.xml',
to: process.env.CELL_PHONE,
from: process.env.TWIL_NUM,
})
.then(call => console.log(call.sid))
.catch(err => console.log(err));

var TWILIO_TOKEN = "270ff32fe16828869dc30e0c6926fa9e";
var TWILIO_ACCOUNT_SID = "AC55a59221acb23a5aa6f046740bb73317";
var client = require('twilio')(process.env.TWILIO_ACCOUNT_SID, process.env.TWILIO_TOKEN);
#philnash i changed it and fixed the creat typo but the terminal is still saying 'username is required'

Note -: This is not at all a good way but just a workaround. I will edit the answer as soon I will get the right way. This is just a trick which worked in my case.
const client = require('twilio')(<YOUR_ACCOUNT_SID>, <YOUR_ACCOUNT_KEY>);
basically use the keys directly instead of referencing through any variable.

Twilio developer evangelist here.
Aside from the typo in creat that Champa has pointed out in the comments, I think I know where you're going wrong. Your code currently has:
var client = require('twilio')(process.env.AC55a59221acb23a5aa6f046740bb73317, process.env.TWILIO_TOKEN);
I am guessing that it should have something like process.env.TWILIO_ACCOUNT_SID.
The account sid is effectively the username for accessing the API, which is why the error message says that.
Let me know if that helps at all.

I encountered this issue today and was getting message Error: username is required when running my twilio test. Since I am using dotenv, I have a .env file with my environment variables, and this is where I made a mistake. We have another app with the SID and TOKEN variables, so I copied them and left in the export keyword, i.e. export TWILIO_ACCOUNT_SID=..., but if using dotenv, the export keyword is not needed. I removed export and re-run my test script and it all worked, e.g.
TWILIO_ACCOUNT_SID=***
TWILIO_AUTH_TOKEN=***

I was working with a colleague when we encounter the same error. I tried almost all the solutions but didn't work for me (most of the solutions here are the same in a sense).
How we resolve this was amazing: how?
When you are using a file called .env for your environment variables, you need to double checks where you created this file
.env file must be created in your root directory. That means must be inside your project folder not inside sub-folder that is inside your project.
when you are to use it, make sure you reference the right variable. This mistake is
related to this question. such as
// index.js
// this wrong, notice process.env.AC55a59221acb23a5aa6f046740bb73317 in client variable
TWILIO_TOKEN = "270ff32fe16828869dc30e0c6926fa9e";
var client = require('twilio')(process.env.AC55a59221acb23a5aa6f046740bb73317, process.env.TWILIO_TOKEN);
this is correct process.env.TWILIO_ACCOUNT_SID
// .env
TWILIO_ACCOUNT_SID=AC55a59221acb23a5aa6f046740bb73317
Twilio Documentation
Interested in the mistake we made, it's the wrong placement of .env file.

I have ran into this error earlier so, adding to the answers above make sure the .env file is in the root directory, all spellings are correct and dotenv package is used.

I figured out the issue that I was having with this. When starting up the server, make sure that you are in the directory that contains the .env file.

The Silly mistake which I made was, I used "SMS_SID: YourSID", It must be "SMS_SID = YourSID".

In my case, everything was correct except I was using the account_sid and auth_token of test credential instead of Live credential.

MongoDB - Error: Cannot find module '../build/Release/bson'

I tried to run a typescript example in the following way which caused following error:
$ mongod --dbpath /home/u/databases
$ npm install
$ tsc --sourcemap --module commonjs app.ts
$ node app.js
{ [Error: Cannot find module '../build/Release/bson'] code: 'MODULE_NOT_FOUND' }
js-bson: Failed to load c++ bson extension, using pure JS version
========================================================================================
= Please ensure that you set the default write concern for the database by setting =
= one of the options =
= =
= w: (value of > -1 or the string 'majority'), where < 1 means =
= no write acknowledgement =
= journal: true/false, wait for flush to journal before acknowledgement =
= fsync: true/false, wait for flush to file system before acknowledgement =
= =
= For backward compatibility safe is still supported and =
= allows values of [true | false | {j:true} | {w:n, wtimeout:n} | {fsync:true}] =
= the default value is false which means the driver receives does not =
= return the information of the success/error of the insert/update/remove =
= =
= ex: new Db(new Server('localhost', 27017), {safe:false}) =
= =
= http://www.mongodb.org/display/DOCS/getLastError+Command =
= =
= The default of no acknowledgement will change in the very near future =
= =
= This message will disappear when the default safe is set on the driver Db =
========================================================================================
/home/u/tmp/TypeScriptSamples/imageboard/app.js:9
app.configure(function () {
^
TypeError: Object function (req, res, next) {
app.handle(req, res, next);
} has no method 'configure'
at Object.<anonymous> (/home/u/tmp/TypeScriptSamples/imageboard/app.js:9:5)
at Module._compile (module.js:456:26)
at Object.Module._extensions..js (module.js:474:10)
at Module.load (module.js:356:32)
at Function.Module._load (module.js:312:12)
at Function.Module.runMain (module.js:497:10)
at startup (node.js:119:16)
at node.js:929:3
Furthermore, looking at db.ts I think http and url are missing in package.json file, am I right?
How is it possible to fix the above error with mongodb?

in Linux operating system first remove bson folder from node_modules and run this command:
sudo apt-get install gcc make build-essential
and then restart nodejs file such as index.js. Hope its helpful

I am using connect-mongo for sessions. I had the same problem and was because the version of connect-mongo generated an error with the version 4.0.x of mongoose. You could check each version of the dependencies you are using.

looking at db.ts I think http and url are missing in package.json file, am I right?
No. These modules are a part of core nodejs.
The source of the error is the package.json specifying minimum numbers without backward in compatible version locks. https://github.com/Microsoft/TypeScriptSamples/blob/master/imageboard/package.json#L6 I would change '>=' to be harder versions e.g. 3.x