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

declare const array: <A>(arr: ReadonlyArray<A>) => number

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

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

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

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

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

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

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

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

declare const structureKeys: <A extends object>(o: A, keys: ReadonlyArray<keyof A>) => number

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

declare const symbol: unique symbol