Cannot find module 'blahblahblah.js'

[aryeharmon]

i have the following script:
var thread = spawn(function(input, done) {
var blahblah = require('./inc/blahblahblah.js');
});
i am not being able to import modules from within the process.
Error: Cannot find module

[aryeharmon]

i am able to require npm modules but not custom built modules.

[andywer]

Hi @aryeharmon!

Thanks for opening the issue. One question: What exactly do you mean by "custom built modules"?

[aryeharmon]

@andywer modules i have made. (not using npm modules)

[andywer]

Like require('lodash') works, but require('./my-stuff') does not work?

Btw: Are you experiencing those troubles in node or in the browser (using webpack, browserify or such)?

[aryeharmon]

yes, i found the issue. apparently the path inside the thread is not the same path as my app.
inside the thread __dirname does not seem to work.

[aryeharmon]

in node

[andywer]

Nice to hear that it's already solved. Not sure if the documentation needs to be improved though...

[pietrop]

I am having the same issue. What was the solution you found to get require('./my-stuff') work?

[aryeharmon]

@pietrop i passed __dirname to the thread so that i can use it.

        var thread = spawn(function(input, done) {
            var someModule = require(input.__dirname + '/my-stuff.js');
            // do your stuff
        });
        thread.send({__dirname: __dirname})......

[aryeharmon]

@andywer yes, i think we should update the documentation

[andywer]

I totally agree! Added a FAQ section to the README: https://github.com/andywer/threads.js#faq-frequently-asked-questions

Thanks for your feedback @aryeharmon @pietrop! :)

[alejandrosofter]

Error: Cannot find module '/server/utilidades.js' .. also?

[aryeharmon]

@alejanrosofter send a code snippet, did you pass the dirname to the worker?

[alejandrosofter]

yes this is error log:
W20170417-14:14:34.631(-4)? (STDERR) Error: Cannot find module '/server/utilidades.js'
W20170417-14:14:34.634(-4)? (STDERR) at Function.Module._resolveFilename (module.js:325:15)
W20170417-14:14:34.634(-4)? (STDERR) at Function.Module._load (module.js:276:25)
W20170417-14:14:34.635(-4)? (STDERR) at Module.require (module.js:353:17)
W20170417-14:14:34.635(-4)? (STDERR) at require (internal/module.js:12:17)
W20170417-14:14:34.636(-4)? (STDERR) at module.exports (evalmachine.:4:22)
W20170417-14:14:34.636(-4)? (STDERR) at process. (/home/cabox/workspace/app/node_modules/threads/lib/worker.node/slave.js:77:5)
W20170417-14:14:34.637(-4)? (STDERR) at emitTwo (events.js:87:13)
W20170417-14:14:34.637(-4)? (STDERR) at process.emit (events.js:172:7)
W20170417-14:14:34.638(-4)? (STDERR) at internal/child_process.js:721:12
W20170417-14:14:34.638(-4)? (STDERR) at nextTickCallbackWith0Args (node.js:489:9)
W20170417-14:14:34.639(-4)? (STDERR) at process._tickCallback (node.js:418:13)

and this is part my code:
const spawn = require('threads').spawn;

const thread = spawn(function(input, done) {
var mongo = require('mongodb-bluebird');
var someModule = require(input.__dirname + '/utilidades.js');
...

thread .send({doc:doc,hola:"see",__dirname: __dirname})

[aryeharmon]

what is your project file structure? are you sure '/server/utilidades.js' exists?

[alejandrosofter]

app
--->client
---->main.js
---- >views

---->server
--->main.js
---->utilidades.js
---->consultas.js
----->_generarDeuda.js

---->lib
---->collections.js
---->routes.js

i make thread from _generarDeuda.js

[andywer]

Error: Cannot find module '/server/utilidades.js'. Why is there a leading /?

I guess somewhere you have a require('/server/...') instead of require('./server/...').

[alejandrosofter]

not seem require.. andywer can pass the proyect from codeanywhere (without obligation) with your email

[brennanerbz]

Tried...

const thread = spawn(function(input, done) {
	const program = require(input.__dirname + '/program.js')
});
thread.send({ __dirname: __dirname })

Getting webpack_require is not defined.

Any suggestions for how to use with webpack?

[andywer]

Hey @brennanerbz. Yeah, that won't work.

You can create a small separate bundle for program.js using webpack and pass this file to spawn, though.

[brennanerbz]

@andywer is there any way to not create a separate bundle?

[andywer]

@brennanerbz I don't think there is a way around it. Since the function you pass to spawn() will be run in another execution context, you cannot access identifiers from outside the function, incl. webpack_require .

Sorry for the bad news 😕😉

[brennanerbz]

@andywer I removed webpack as a dependency, and it works now.

Also, do you have any links to projects using this in the wild? I want to see a more complete example.

[andywer]

@brennanerbz Not really, but you can check out https://www.npmjs.com/browse/depended/threads

[andywer]

PS: Nice to see you got it working :) What do you mean by removed webpack as a dependency?