[WIP] GH-4874: Build the electron app from the source.

[kittaakos]

Closes #4874.

Signed-off-by: Akos Kitta kittaakos@typefox.io

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Steps to build:

• Clone Theia and run yarn to install the dependencies.
• Run yarn --cwd ./examples/electron/ package to build the bundled electron application from the source.
• Run open ./examples/electron/dist/mac/Theia.app/ (on macOS) to start the application.

The bundled application will be under theia/examples/electron/dist.
By default, the electron-builder builds an application based on your OS.

[kittaakos]

After installing it to the /Applications/ I can see the following error:

messages.js:46 Uncaught (in promise) Error: Error: Failed to spawn node
Perhaps it is not on the PATH.
    at new ResponseError (messages.js:46)
    at handleResponse (main.js:430)
    at processMessageQueue (main.js:258)
    at Immediate.<anonymous> (main.js:242)
    at runCallback (timers.js:696)
    at tryOnImmediate (timers.js:667)
    at processImmediate (timers.js:649)
main.js:825 Uncaught (in promise) Error: Connection got disposed.
    at Object.dispose (main.js:825)
    at TypeScriptClientContribution.<anonymous> (language-client-contribution.ts:158)
    at step (language-client-contribution.ts:15)
    at Object.throw (language-client-contribution.ts:15)
    at rejected (language-client-contribution.ts:15)
DevTools failed to parse SourceMap: file:///Applications/Theia.app/Contents/Resources/app/lib/9.bundle.js.map

It works when running from theia/examples/electron/dist, this must be a PATH issue although we call fix-path from the electron maim module. I will work on this a bit.

[akosyakov]

I wonder do you need email and homepage? It was failing for me without.
If I run yarn package i get:

Error: Please specify author 'email' in the application package.json

[akosyakov]

I can verify that preview command works, nice!

Maybe we don't need package command. I don't think our example app is good example, it has so many unnecessary extensions for the simple app.

[kittaakos]

If I run yarn package i get:

Error: Please specify author 'email' in the application package.json

No, it was not failing to me, but this PR is wrong as is, sorry for the noise. Incorrect versions are picked up due to the way the electron-builder collects the hoisted dependencies.