Copy-webpack yarn theia build

#1

Coming back to theia project. This can be very simple thing.
I am trying to build it. Got stuck on nodejs version so I moved to v12 from v16.
Now I am stuck on command yarn theia build

message is:
Failed to load … config
Invalid options object. Copy Plugin has been initialized using an options object that does not match the API schema

  • options.patterns should be a non empty array

So it is something to do with copy-webpack plugin. What should I tweek about my environment?

#2

Hi @tsadigov! This might be unrelated to your problem, but in the Theia readme it’s suggested that you might encounter some issues with Node 16.
Did you try running yarn --ignore-engines or downgrading to Node 14, if possible?

See https://github.com/eclipse-theia/theia/blob/master/doc/Developing.md#prerequisites

#3

Hard to say with the little context in your post, but my guess is that your generated gen-webpack.config.js code is out of date and needs to be regenerated.

Here’s what to expect, roughly (L27-L38):

const plugins = [
    new CopyWebpackPlugin({
        patterns: [{
            from: monacoEditorCorePath,
            to: 'vs'
        }]
    }),
    new webpack.ProvidePlugin({
        // the Buffer class doesn't exist in the browser but some dependencies rely on it
        Buffer: ['buffer', 'Buffer']
    })
];
#4

thanks, in order to avoid surprises I uninstalled 16 and instsalled nodejs12. And I get this error with v12

#5

Hi @tsadigov,

I think this is the same issue as here. You need to add the @theia/monaco dependency to your build. Not only does Theia not build without it, even if you were to get it to build, it does not run correctly.

#6

Hello thanks for your replies

It was my fault of misunderstanding documentation. Sorry for not being able to provide good context.

I downloaded source and checked readme for quick way to execute it to start playing with ide. Got to this link https://theia-ide.org/docs/composing_applications and tried to execute them inside the repo with code.
I applied commands in wrong context.

I should have looked into this link https://github.com/eclipse-theia/theia/blob/master/doc/Developing.md
And should have run this command
yarn
&& yarn download:plugins
&& yarn browser build
&& yarn browser start

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