export declare const range: (end: number, start?: number) => number[];
export declare const to: <A, T>(fn: (items: A[]) => T) => (sum: any, _item: A, index: number, all: A[]) => T;
export declare const constant: <T>(value: T) => () => T;
export declare const identity: <T>(x: T) => T;
export declare const toIndexedObject: <T, V, R extends {
    [key: string]: V;
}>(fn: (item: T, index: number) => [string, V]) => (sum: R, item: T, index: number) => R;
export declare const mapToIndexedObject: <T, V, R extends {
    [key: string]: V;
}>(fn: (item: T, index: number) => [string, V], items: T[], initial?: R) => R;
export declare const pairsToIndexedObject: <V, R extends {
    [key: string]: V;
}>(sum: R, [key, value]: [string, V]) => R;
declare global {
    interface Array<T> {
        chain_<U>(fn: (arr: Array<T>) => U): U;
    }
}
export declare type Validation<E, S> = {
    success: true;
    value: S;
} | {
    success: false;
    error: E;
};
export declare const successfulValidation: <S>(value: S) => Validation<never, S>;
export declare const failedValidation: <E>(error: E) => Validation<E, never>;
export declare const take: <T>(count: number, arr: T[]) => T[];
export declare const drop: <T>(count: number, arr: T[]) => T[];
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