Function checkGojaValueForError

plugins/jsvm/binds.go:1046–1065

------------------------------------------------------------------- checkGojaValueForError resolves the provided goja.Value and tries to extract its underlying error value (if any).

(app core.App, value goja.Value)

// checkGojaValueForError resolves the provided goja.Value and tries
// to extract its underlying error value (if any).
func checkGojaValueForError(app core.App, value goja.Value) error {
	if value == nil {
		return nil
	}

	exported := value.Export()
	switch v := exported.(type) {
	case error:
		return v
	case *goja.Promise:
		// Promise as return result is not officially supported but try to
		// resolve any thrown exception to avoid silently ignoring it
		app.Logger().Warn("the handler must a non-async function and not return a Promise")
		if promiseErr, ok := v.Result().Export().(error); ok {
			return normalizeException(promiseErr)
		}
	}

	return nil
}

// normalizeException checks if the provided error is a goja.Exception
// and attempts to return its underlying Go error.