declare function isNotNull<T>(input: T | undefined | null): input is T;
declare function checkNever(_x: never): undefined;
type StringOnly<T> = Extract<T, string>;
type NumberOnly<T> = Extract<T, number>;
type OneOrMore<T> = readonly [T, ...T[]];
type CompactType<T> = {
    [P in keyof T]: T[P];
};
/**
 * WARNING: This is a hack do type exhaustiveness check
 */
declare function assertExclude<T, const E>(asserting: T, excluding: E): asserts asserting is Exclude<T, E>;
declare namespace assertExclude {
    const i: <T>() => T;
}

export { type CompactType, type NumberOnly, type OneOrMore, type StringOnly, assertExclude, checkNever, isNotNull };