Che: HTML LS can't start

[azatsarynnyy]

Describe the bug

HTML Language Server is provided to Che Theia though the VS Code built-in extension
https://github.com/eclipse/che-theia/blob/727b6c5a1e650a1357652610b48482a9cc5c9bae/generator/src/templates/theiaPlugins.json#L20

When opening any HTML file, Che Theia shows the error notifications, see the attached screenshots.

Che version

• [ ] latest
• [x] nightly
• [ ] other: please specify

Steps to reproduce

Open any HTML file in Che Theia.

Expected behavior

HTML language features as an autocomplete, hovers, etc. should be provided.

Screenshots

Eclipse Che Logs

From HTML Language Server output channel:

internal/modules/cjs/loader.js:638
    throw err;
    ^

Error: Cannot find module 'typescript'
    at Function.Module._resolveFilename (internal/modules/cjs/loader.js:636:15)
    at Function.Module._load (internal/modules/cjs/loader.js:562:25)
    at Module.require (internal/modules/cjs/loader.js:692:17)
    at require (internal/modules/cjs/helpers.js:25:18)
    at Object.<anonymous> (/default-theia-plugins/vscode-builtin-html-language-features/extension/server/dist/htmlServerMain.js:1:473959)
    at n (/default-theia-plugins/vscode-builtin-html-language-features/extension/server/dist/htmlServerMain.js:1:158)
    at Object.<anonymous> (/default-theia-plugins/vscode-builtin-html-language-features/extension/server/dist/htmlServerMain.js:1:520451)
    at n (/default-theia-plugins/vscode-builtin-html-language-features/extension/server/dist/htmlServerMain.js:1:158)
    at Object.<anonymous> (/default-theia-plugins/vscode-builtin-html-language-features/extension/server/dist/htmlServerMain.js:1:38535)
    at n (/default-theia-plugins/vscode-builtin-html-language-features/extension/server/dist/htmlServerMain.js:1:158)
[Error - 10:08:00 AM] Connection to server got closed. Server will not be restarted.

Additional context

Note, s.languages.registerOnTypeRenameProvider is not a function is a known upstream issue https://github.com/eclipse-theia/theia/issues/7987. Despite that error, HTML LS starts in upstream Theia.

I've tried with several different versions of html-language-features and the result is the same.

First, need to check this path https://github.com/microsoft/vscode/blob/182db07de2745fe3a6369f4ad80ae930e006a99b/extensions/html-language-features/server/src/modes/javascriptLibs.ts#L12

[shahar-h]

See: https://github.com/eclipse-theia/theia/pull/8224