Failed to start language server 'JavaScript'.

[jopit]

We're seeing this message when we edit a JavaScript file in our Theia application. Our package.json file does pull in @theia/typescript, which in turn pulls in typescript-language-server, which says it supports both JavaScript and TypeScript.

$ cat package.json 
{
    "private": true,
    "dependencies": {
        "@theia/typescript": "^0.3.7",
        "@theia/navigator": "^0.3.7",
        "@theia/terminal": "^0.3.7",
        "@theia/outline-view": "^0.3.7",
        "@theia/preferences": "^0.3.7",
        "@theia/messages": "^0.3.7",
        "@theia/git": "^0.3.7",
        "@theia/file-search": "^0.3.7",
        "@theia/markers": "^0.3.7",
	"@theia/java": "^0.3.7"
    },
    "devDependencies": {
        "@theia/cli": "^0.3.7"
    }
}

There are no related messages written to the console by the running Theia app. Is there some other dependency that we are missing?

[kittaakos]

You could try to install typescript to the global or make it available from the workspace root.
See: #1392 (comment)

[kittaakos]

For some reason, GH does not link the proper comment. I meant this one:

Here is how the language server looks up the tsserver binary:
https://github.com/theia-ide/typescript-language-server/blob/master/src/lsp-server.ts#L69

For sure, we need to send proper information to the user in case it cannot find it. (see typescript-language-server/typescript-language-server#28)

[jopit]

OK, installing typescript to the global scope worked, thanks.

Is there a mailing list or blog or someplace where changes like the removal of typescript from the dependencies of typescript-language-server are announced?

Btw, I also noticed that the theia docker image https://hub.docker.com/r/theiaide/theia/ doesn't have typescript installed and so has the same problem.

[marcdumais-work]

@jopit FYI, about the docker images having this issue: theia-ide/theia-apps#29

[kittaakos]

Is there a mailing list or blog or someplace where changes like the removal of typescript from the dependencies of typescript-language-server are announced?

I am not aware of such a channel, unfortunately.

Edit: the best is to ask on the Theia Gitter channel.

[akosyakov]

Btw, I also noticed that the theia docker image https://hub.docker.com/r/theiaide/theia/ doesn't have typescript installed and so has the same problem.

thanks for mentioning it, I will check it.

Is there a mailing list or blog or someplace where changes like the removal of typescript from the dependencies of typescript-language-server are announced?

GH notifications :)

[kittaakos]

I am closing this now. @jopit, please reopen, or create a follow-up if you have further questions/problems with this.