Hi petays,
Thank you for writing.
We will consider adding Typescript definitions in the future versions. At present, we are focused on building the User Interface components and adding the missing features to the existing components.
Is not it possible to use the Framework without Typescript? We have tutorials like that one https://www.htmlelements.com/docs/create-angular-and-react-applications-with-shared-web-components/ which shows how to use a Custom Element from our framework within Angular & React projects which use Typescript. As for Type checking, all properties in our UI Components are Typed(int, float, date, string, bool) with built-in type checking at run-time i.e invalid values are handled by the framework.
Best regards,
Boyko Markov
https://www.htmlelements.com
Smart HTML Elements Team

I decided to roll on my own type definitions to keep typescript compiler happy.
With a smart guy this kind of type definitions could be generated programmatically in no time!
It is a bit tedious and I feel a bit stupid doing this, but I feel it is easier for my eyes to do this way:

export interface MenuEvent extends CustomEvent {
    detail: SmartMenuItem;
}
export interface SmartMenu extends HTMLElement {
    locale: string;
}
export interface SmartMenuItem extends HTMLElement {
    item: any;
    label: any;
    value: any;
}
export interface SmartTextBox extends HTMLElement {
    locale: string;
    readonly: boolean;
    required: boolean;
    theme: string;
    value: string;
}
export interface SmartPasswordTextBox extends HTMLElement {
    locale: string;
    maxLength: number;
    minLength: number;
    passwordStrength: (password, allowedSymbols) => string;
    required: boolean;
    showPasswordIcon: boolean;
    showPasswordStrength: boolean;
    theme: string;
    tooltipArrow: boolean;
    value: string;
}
export interface SmartDropDownList extends HTMLElement {
    displayMember: string;
    locale: string;
    selectedIndexes: any[];     // array type?
    selectedValues: any[];      // array type?
    selectionMode: string;
    valueMember: string;
    clearItems();
    insert(position: number, value: any);
}

Update:
Typescript definitions are now part of the Smart Web Components download package.
Best Wishes,
Smart HTML Elements Team
https://www.htmlelements.com