wp-calypso/packages/data-stores/src/reader/constants.ts

export enum EmailDeliveryFrequency {
	Instantly = 'instantly',
	Daily = 'daily',
	Weekly = 'weekly',
}

export enum PostSubscriptionsSortBy {
	PostName = 'post_name',
	RecentlyCommented = 'recently_commented',
	RecentlySubscribed = 'recently_subscribed',
}

export enum SiteSubscriptionsFilterBy {
	All = 'all',
	Paid = 'paid',
	P2 = 'p2',
	RSS = 'rss',
}

export enum SiteSubscriptionsSortBy {
	SiteName = 'site_name',
	LastUpdated = 'last_updated',
	DateSubscribed = 'date_subscribed',
}