/**
 * [[include:option-utils/README.md]]
 * @module
 */
/**
 * Optional type.
 */
export declare type Maybe<T> = T | null | undefined;
/**
 * Applies a function to a list of null/undefined values, unwrapping the null/undefined value or passing it through.
 */
export declare const mapN: <T extends unknown[], U>(fn: (...a: { [K in keyof T]: NonNullable<T[K]>; }) => U, ...args: T) => U | null | undefined;
/**
 * Applies a function to a null/undefined inner value if it is null or undefined,
 * otherwise returns null/undefined.
 *
 * For consistency reasons, we recommend just using {@link mapN} in all cases.
 *
 * @deprecated use {@link mapN}
 * @param obj
 * @param fn
 * @returns
 */
export declare const mapSome: <T, U>(obj: NonNullable<T> | null | undefined, fn: (obj: NonNullable<T>) => U) => U | null | undefined;
/**
 * Checks to see if the provided value is not null.
 *
 * Useful for preserving types in filtering out non-null values.
 *
 * @param value
 * @returns
 */
export declare const isNotNull: <TValue>(value: TValue | null) => value is TValue;
/**
 * Checks to see if the provided value is not undefined.
 *
 * @param value
 * @returns
 */
export declare const isNotUndefined: <TValue>(value: TValue | undefined) => value is TValue;
/**
 * Checks to see if the provided value is not null or undefined.
 *
 * @param value
 * @returns
 */
export declare const exists: <TValue>(value: TValue | null | undefined) => value is TValue;
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