diceroll.ts

diceroll.ts

const rollSingle = (face: number, rolled: number[]): number => {
  const r = Math.ceil(Math.random() * face)
  rolled.push(r)
  return r
}

const roll = (count: number, face: number, rolled: number[]): number => [...Array(count)].reduce(r => r + rollSingle(face, rolled), 0)

globalThis.roll = roll

interface IDiceResult {
  rolled: number[]
  sum: number
}

const dice = (exp: string): IDiceResult => {
  if (!exp.match(/^[\d\+\-\*\/\(\)D]+$/i)) { return { sum: 0, rolled: [] } }
  return new Function('"use strict"; const rolled = []; const sum = ' + exp
    .replace(/(\d+)?D(\d+)/ig, (code, c, f) => `roll(${c||'1'},${f}, rolled)`) + '; return { sum, rolled, exp: "' + exp + '" }')()
}

index.d.ts

declare var roll: (count: number, face: number, rolled: number[]) => number