export declare const isHash: (u: unknown) => u is Hash

export declare const array: <A>(arr: readonly A[]) => number

export declare const cached: { (self: object): (hash: number) => number; (self: object, hash: number): number }

export declare const combine: (b: number) => (self: number) => number

export declare const hash: <A>(self: A) => number

export declare const number: (n: number) => number

export declare const optimize: (n: number) => number

export declare const random: <A extends object>(self: A) => number

export declare const string: (str: string) => number

export declare const structure: <A extends object>(o: A) => number

export declare const structureKeys: <A extends object>(o: A, keys: readonly (keyof A)[]) => number

export interface Hash {
  [symbol](): number
}

export declare const symbol: typeof symbol