export interface CohortFrequencyRegistry {
    day: never;
    month: never;
}
export type CohortFrequency = keyof CohortFrequencyRegistry;
export interface CohortData {
    /** The timestamp for the start of the bucket, at midnight. */
    date: string;
    /** The percentage rate of users who registered in the specified `period` and were active for the given `date` bucket. */
    rate: number;
    /** How many users registered in the specified `period` and were active for the given `date` bucket. */
    value: number;
}
/**
 * Represents a retention metric.
 */
export interface Cohort {
    /** The timestamp for the start of the period, at midnight. */
    period: string;
    /** The size of the bucket for the returned data. */
    frequency: CohortFrequency;
    /** Retention data for users who registered during the given period. */
    data: CohortData[];
}