@grpc/grpc-js/build/src/duration.d.ts

gRPC Library for Node - pure JS implementation

export interface Duration {
    seconds: number;
    nanos: number;
}
export declare function msToDuration(millis: number): Duration;
export declare function durationToMs(duration: Duration): number;
export declare function isDuration(value: any): value is Duration;
export declare function parseDuration(value: string): Duration | null;