Does code completion work differently for different languages?

[donaldpipowitch]

I changed the actionEvent in the lsp-sample from"onLanguage:plaintext" (see here) to "onLanguage:json"/"onLanguage:jsonc" and opened a JSON file. I tried to write T or J somewhere to get autocompletion for TypeScript or JavaScript just as in the case of the plain text file, but it seems that the onCompletion callback is never called.

Is this a bug or a different languages treated differently? What should I need to do to get auto completion for other languages? I couldn't find something specific about this in the docs.

[KamasamaK]

The activationEvents are just for when the extension is activated and unrelated to LSP. What determines whether the language features (like completion) are triggered is documentSelector.

[donaldpipowitch]

Thank you so much for the explanation! 😍

[donaldpipowitch]

Not sure, if I still do something wrong. I added this and it still doesn't seem to add code completion to JSON files.

documentSelector: [
    { scheme: 'file', language: 'plaintext' },
    { scheme: 'file', language: 'json' },
    { scheme: 'file', language: 'jsonc' }
],

[donaldpipowitch]

Update: It looks like on-type code completion works outside of comments, string values and properties. Completions with Ctrl+Space seem to work everywhere. Any idea why?

[KamasamaK]

When in comments and strings, the default in VS Code is that only triggerCharacters and manually triggering (via Ctrl+Space) work to trigger a completion. You can change this default with the editor.quickSuggestions setting.

[donaldpipowitch]

Thank! I'll try that out in the next days.

[donaldpipowitch]

Okay, I tried editor.quickSuggestions.strings, but it doesn't seem to work for my use case?

{
  "foo": "Typ<doesn't auto complete to TypeScript here>"
}

[jrieken]

That is specific problem with JSON - quick suggestions only work when typing at the end of a word and JSON defines " to be part of the word. cc @aeschli

[aeschli]

duplicate of microsoft/vscode#30811

[donaldpipowitch]

When I understand microsoft/vscode#30811 correctly JSON treats " as the part of a word, right? So I tried this, but it doesn't seem to work?

{
-    label: 'TypeScript',
+    label: '"TypeScript',
    kind: CompletionItemKind.Text,
    data: 1
}

Is there some kind of workaround? 🤔

[aeschli]

The point is that quick suggestions only pop up when at the end of a symbol (word).
For JSON

{
  "foo": "Typ|"
}

is not at the end of a symbol, but in the middle (" is also part of the symbol)

[donaldpipowitch]

When I understand Microsoft/vscode#30811 correctly JSON treats " as the part of a word, right? So I tried this, but it doesn't seem to work?

I tried this again and now it actually seems to work 🤔