import { Observable } from 'rxjs';
type ExtrapolateType = 'extend' | 'identity' | 'clamp';
export declare function _interpolate(input: number, inputRange: readonly number[], outputRange: readonly number[], options?: {
    easing?: (input: number) => number;
    extrapolateLeft?: ExtrapolateType;
    extrapolateRight?: ExtrapolateType;
}): number;
export declare function interpolate(inputRange: readonly number[], outputRange: readonly number[], options?: {
    easing?: (input: number) => number;
    extrapolateLeft?: ExtrapolateType;
    extrapolateRight?: ExtrapolateType;
}): (frame: Observable<number>) => Observable<number>;
export {};