Running "theia build" in hello-world-extension project browser-app folder breaks it all

[maxhillaert]

Description

I'm using the project setup as suggested by the "Authoring Extension" gitbook section: https://www.theia-ide.org/doc/Authoring_Extensions.html

The setup seems to be brittle when you run yarn scripts at the wrong location within the project. theia build in browser-app will break the bundles and make the extension disappear from the theia-app when started.

Reproduction

Execute the steps in the tutorial

1. yo theia-extension hello-world-extension
2. let it finish , which will run "yarn prepare" script from root of the workspace
3. cd browser-app
4. yarn start
5. Check for Hello Menu item in localhost:3000 and its there
6. Stop the server CTRL-C
7. still in browser-app, do "yarn prepare" which will run theia build
8. When it's finished do "yarn start"
9. Go to localhost:3000 and there is no sign of Hello menu item. No errors.

Any attempt to setup up a workflow with the watch scripts produces the same issue. It just doesn't work as it breaks the link between extension and browser-app. You have to start from scratch and run the lerna command from root?

What is going on here? Am I using wrong versions of things? Is this known issue?

Thanks

OS and Theia version:

Windows 7
yarn 1.15.2
lerna 2.4.0
theia latest as of today

yarn list v1.15.2
├─ @msci/maml-theia-browser@0.0.0
├─ @theia/application-manager@0.6.1
├─ @theia/application-package@0.6.1
├─ @theia/callhierarchy@0.6.1
├─ @theia/cli@0.6.1
├─ @theia/core@0.6.1
├─ @theia/editor@0.6.1
├─ @theia/filesystem@0.6.1
├─ @theia/json@0.6.1
├─ @theia/languages@0.6.1
├─ @theia/markers@0.6.1
├─ @theia/messages@0.6.1
├─ @theia/monaco@0.6.1
├─ @theia/navigator@0.6.1
├─ @theia/node-pty@0.7.8-theia004
├─ @theia/outline-view@0.6.1
├─ @theia/output@0.6.1
├─ @theia/preferences@0.6.1
├─ @theia/process@0.6.1
├─ @theia/terminal@0.6.1
├─ @theia/textmate-grammars@0.6.1
├─ @theia/typescript@0.6.1
├─ @theia/userstorage@0.6.1
├─ @theia/variable-resolver@0.6.1
└─ @theia/workspace@0.6.1

[akosyakov]

Can someone transfer issue to https://github.com/theia-ide/generator-theia-extension? GitHub does not allow me.

[vince-fugnitto]

The watch workflow was described here if anyone had similar issues.

The main idea is the following:

• Perform yarn at the root of the repository.
• Start the browser application by (cd browser-app && yarn start).
• In order to watch the extension, perform (cd {extension-name} && yarn watch) in a new terminal.
• In order to watch the application (so it can see changes from the extension), perform (cd browser-app && yarn watch) in a new terminal.

In this way, the application is running, the extension is being watched for changes, and the browser application is being watched for changes to the extension.

[vince-fugnitto]

Can someone transfer issue to https://github.com/theia-ide/generator-theia-extension? GitHub does not allow me.

Sure, no problem!
eclipse-theia/generator-theia-extension#36

[marcdumais-work]

Can someone transfer issue to https://github.com/theia-ide/generator-theia-extension? GitHub does not allow me.

Looks-like there is a bug in the issue transfer feature. When selecting the destination GH repo, I see the list of repos for a fraction of a second, then the drop-down is empty...

[vince-fugnitto]

Closing as it's been transferred to eclipse-theia/generator-theia-extension#36