function keysimport { keys } from "https://dotland.deno.dev/x/rambda@9.4.1/immutable.d.ts"; keys<T extends object>(x: T): readonly (keyof T & string)[]It applies Object.keys over x and returns its keys. keys<T>(x: T): readonly string[]It applies Object.keys over x and returns its keys. Type ParametersT extends objectParametersx: TReturnsreadonly (keyof T & string)[]Type ParametersTParametersx: TReturnsreadonly string[]