Dynamic snippet evaluation in VSCode

Question

Is it possible for a snippet to insert a dynamically computed completion or snippet in Visual Studio Code?

I would like a snippet for inserting date and time strings

Answer 1

Although, it's possible to achieve simple date-time stuff without extensions:

"⌚ Date Time SNIPPET": {
    "prefix": "datetime",
    "body": [
        "${CURRENT_YEAR}-${CURRENT_MONTH}-${CURRENT_DATE}T${CURRENT_HOUR}:${CURRENT_MINUTE}:${CURRENT_SECOND}",
    ]
}

The question is about dynamic snippets. And here's an example of using CompletionItemProvider:

const datetimeProvider = vscode.languages.registerCompletionItemProvider(
    {
        scheme: 'file',
        // language: 'typescript',
    },
    {
        provideCompletionItems(document: vscode.TextDocument, position: vscode.Position) {
            const completionItem = new vscode.CompletionItem('datetime ⌚', vscode.CompletionItemKind.Snippet);
            completionItem.insertText = new Date(Date.now() - new Date().getTimezoneOffset() * 60000).toISOString().split('.')[0];
            return [completionItem];
        }
    },
    // ''// trigger character
);