function groupByimport { groupBy } from "https://deno.land/x/rambda@9.2.1/files/index.d.ts"; groupBy<T>(groupFn: (x: T) => string, list: T[]): { [index: string]: T[]; }groupBy<T>(groupFn: (x: T) => string): (list: T[]) => { [index: string]: T[]; }groupBy<T, U>(groupFn: (x: T) => string, list: T[]): UgroupBy<T, U>(groupFn: (x: T) => string): (list: T[]) => UType ParametersTParametersgroupFn: (x: T) => stringlist: T[]Returns{ [index: string]: T[]; }Type ParametersTParametersgroupFn: (x: T) => stringReturns(list: T[]) => { [index: string]: T[]; }Type ParametersTUParametersgroupFn: (x: T) => stringlist: T[]ReturnsUType ParametersTUParametersgroupFn: (x: T) => stringReturns(list: T[]) => U