Typings for Browser Presentation API https://developer.mozilla.org/en-US/docs/Web/API/Presentation_API

presentation-api.d.ts

interface Presentation {
    defaultRequest: PresentationRequest;
    receiver: PresentationReceiver;
}
interface PresentationReceiver {
    connectionList: Promise<PresentationConnectionList>;
}

interface PresentationConnection {
    binaryType: ArrayBuffer | Blob;
    readonly id: string;
    readonly state: string;
    readonly url: string;
    onclose: ((this: PresentationConnection, ev: Event) => any) | null;
    onconnect: ((this: PresentationConnection, ev: Event) => any) | null;
    onmessage: ((this: PresentationConnection, ev: Event) => any) | null;
    onterminated: ((this: PresentationConnection, ev: Event) => any) | null;
    close(): void;
    terminate(): void;
    send(data: string | Blob | Array<any>): void;
}

interface PresentationConnectionAvailableEvent extends Event {
    readonly connection: PresentationConnection
}

interface PresentationConnectionList {
    connections: PresentationConnection[];
    onconnectionavailable: ((this: PresentationConnectionList, event: PresentationConnectionAvailableEvent) => any) | null;
}

interface PresentationConnectionCloseEvent {
    readonly message: string;
    readonly reason: 'error' | 'closed' | 'wentaway';
}

interface PresentationAvailability {
    readonly value: boolean;
    onchange: ((this: PresentationAvailability, ev: Event) => any) | null;
}

interface PresentationRequest {
    onconnectionavailable: ((this: PresentationRequest, event: PresentationConnectionAvailableEvent) => any) | null;
    start(): Promise<PresentationConnection>;
    reconnect(presentationId: string): Promise<PresentationConnection>;
    getAvailability(): Promise<PresentationAvailability>;
}

declare var PresentationRequest: {
    prototype: PresentationRequest;
    new(urls: string[] | string): PresentationRequest;
};

declare module global {
    interface Navigator {
        presentation: Presentation
    }
}