streamdeck-typescript/src/interfaces/events/application/application-did-launch.event.ts

This library will help you build elgato stream deck plugins in typescript

/**
 * Data send from the applicationDidLaunch event
 * @category Event Data
 */
export interface ApplicationDidLaunchEvent {
    event: 'applicationDidLaunch';
    payload: {
        application: 'string';
    };
}