Brain.js: Not possible to require or import?

[embiem]

I switched to this maintained library from the old one. Just doing the switch, I am no longer able to use a standard const brain = require('brain.js') (I basically just changed from brain to brain.js in the require), because the module will not be exported but put on the global window variable.

Is there a reason for this? For now I just access the library using window.brain, but it would be nice to actually import/require the module to achieve a modern build process using e.g. webpack.

Any info on this and explanation why it is done this way would be nice.

//edit: I'm using brain inside the browser, I also tried brain.js/browser and it is also adding brain to window instead of exporting it.

[robertleeplummerjr]

Is this in the browser?

[embiem]

Yes

On 28 Jul 2017 18:22, "Robert Plummer" [e-mail] wrote:

Is this in the browser?

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[robertleeplummerjr]

I will address this shortly, very good points being made here.

[michaelsanford]

Is the intention to go with the ES6-style

import { xxx } from brain;

?

That would be my humble recommendation, at least. This would presumably allow existing implementations of require('brain.js') that expect it to be attached to window not to break, at least for now.

To wit, are there cases in which the browser variant is called and there is _not_ an available window?

@robertleeplummerjr If you've not yet gotten around to it, I'd be interested in working on this.

[robertleeplummerjr]

I believe this is now resolved.
@michaelsanford the library uses (at least I looked) import { xxx } from whatever;, (src/neural-network.js, for example) but does not in index.js which gets files from ./dist, which are es5.

If you'd like to use the es6 files, simply use import brain from 'brain.js/src'; or import brain from 'brain.js/src/index'; _I think_.

@robertleeplummerjr If you've not yet gotten around to it, I'd be interested in working on this.

I didn't see that till it was too late. Feel free to check the wiki, the direction, and any outstanding bugs. Committers & forks are wanted and loved.

Ty!

[michaelsanford]

Sweet! Perfect timing.

And I'm happy to hear that: I'll definitely poke around this _most intriguing_ library. 👍

[robertleeplummerjr]

Just wait till you see what we have planned next. Full on GPU power for web and node.

[robertleeplummerjr]

fiy: https://github.com/harthur-org/brain.js/tree/nn-gpu
It isn't like "we plan on doing this... someday" no, it is already running. We just want to simplify it so that anyone can learn ai.

[embiem]

That's awesome! Thanks for fixing and very cool to see this library still being actively developed.

[robertleeplummerjr]

Thanks for helping us make it better

[jasonhargrove]

Sadly does not work using the /src solution described above. It throws an import error. (Using babel and webpack). Odd regression re something as simple as module loading.

Here's what works in 1.0.0-rc.3:

  require('brain.js/browser.js');

This attaches brain to window.brain.

For those who use webpack, you'll get a complaint about a pre-built javascript file.

You can make the warning go away by adding noParse to your webpack config:

module: {
  noParse: [
    /node_modules\/brain.js\/browser.js/
  ],
  preLoaders: []
}

[jasonhargrove]

To aid those searching, the error we experienced that resulted from the upgrade is TypeError: brain.NeuralNetwork is not a constructor. (Because it's not loading properly anymore.)

[robertleeplummerjr]

webpack needs a node file, use: require('brain.js'); I _think_ should fix it.

[robertleeplummerjr]

Did the above solution help at all?

[treyreynolds]

Hopefully, this is helpful if someone is reading this in the future:

For the ES6 import to work I used: import brain from 'brain.js/src/index';

[robertleeplummerjr]

@jasonhargrove this should be resolved now, can you confirm?

[nadeeraka]

Module not found: Can't resolve 'brain.js' in react
this can solve importing brain js
import brain from 'brain.js/src/index'