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  • The example code below adds code completion to the server. It proposes the two words ‘TypeScript’ and ‘JavaScript’
// This handler provides the initial list of the completion items.
connection.onCompletion(
  (_textDocumentPosition: TextDocumentPositionParams): CompletionItem[] => {
    // The pass parameter contains the position of the text document in
    // which code complete got requested. For the example we ignore this
    // info and always provide the same completion items.
    return [
      {
        label: 'TypeScript',
        kind: CompletionItemKind.Text,
        data: 1
      },
      {
        label: 'JavaScript',
        kind: CompletionItemKind.Text,
        data: 2
      }
    ];
  }
);

// This handler resolves additional information for the item selected in
// the completion list.
connection.onCompletionResolve(
  (item: CompletionItem): CompletionItem => {
    if (item.data === 1) {
      item.detail = 'TypeScript details';
      item.documentation = 'TypeScript documentation';
    } else if (item.data === 2) {
      item.detail = 'JavaScript details';
      item.documentation = 'JavaScript documentation';
    }
    return item;
  }
);

  • tell vscode that server supports completion
connection.onInitialize((params): InitializeResult => {
    ...
    return {
        capabilities: {
            ...
            // Tell the client that the server supports code completion
            completionProvider: {
                resolveProvider: true
            }
        }
    };
});


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