https://aizatto.github.io/calendar/
https://developers.google.com/identity/protocols/OAuth2UserAgent https://github.com/DefinitelyTyped/DefinitelyTyped/tree/master/types/gapi https://github.com/DefinitelyTyped/DefinitelyTyped/tree/master/types/gapi.auth2 https://github.com/DefinitelyTyped/DefinitelyTyped/blob/master/types/gapi.calendar/index.d.ts https://github.com/google/google-api-javascript-client#gapiclientrequestargs https://developers.google.com/calendar/v3/reference/events/list