resolving vscode thenable

vscode Thenable is a promise, we just need to return a promised of a type, as illustrated in code below :-

class CodeCompletionItemProvider implements CompletionItemProvider {

public provideCompletionItems(

document: vscode.TextDocument, position: vscode.Position, token: vscode.CancellationToken): Thenable<vscode.CompletionItem[]> {

             let linePrefix = document.lineAt(position).text.substr(0, position.character);

             if (linePrefix.endsWith('std.')) {

                console.log('great stuff!!!!');

                // returning thenable //

                return new Promise<vscode.CompletionItem[]>((resolve, reject) => {

                const dockerRunTask = new vscode.CompletionItem('crapRun');

                dockerRunTask.insertText = new vscode.SnippetString('\n{\n\t"task": "dockerRunTask", \n\t"desc": "${1}"\n}');

                    resolve([dockerRunTask]);

                });

             }

             return undefined

}

}