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export interface DieConfig {  times: number;  face: number;  modifier: number;}
function parseExpression(exp: string): DieConfig {  const matches = /^\s*(\d*)\s*d\s*(\d+)\s*([-+])*\s*(\d*)\s*$/.exec(exp);  if (!matches) {    throw new Error(      `Die Expression ${exp} is not of the format <count>d<faces> (eg. 2d10)`,    );  }  const times = Number(matches[1]);  const face = Number(matches[2]);  let modifier = Number(matches[4]);  if (matches[3] === "-") modifier *= -1;  else if (!matches[3]) modifier = 0;  if (isNaN(face)) {    throw new Error(      `Die Expression ${exp} is not of the format <count>d<faces> (eg. 2d10)`,    );  } else {    return { times: times || 1, face, modifier: modifier || 0 };  }}
export interface RollOptions {  times?: number;  face?: number;  separate?: boolean;  modifier?: number;}const defaultRollOptions: RollOptions = {  times: 1,  face: 6,  separate: false,  modifier: 0,};
/** * Roll an unbiased die.  * A biased die can be implemented using GachaMachine. * @param exp Die expression * @param separate whether to consider each roll individually */export function rollDie(exp: string, separate?: boolean): number | number[];/** * Roll an unbiased die. * A biased die can be implemented using GachaMachine. * @param options Options for rolling the die. */export function rollDie(options: RollOptions): number | number[];export function rollDie(): number;/** * Roll an unbiased die. * A biased die can be implemented using GachaMachine. */export function rollDie(  optOrExp: RollOptions | string = defaultRollOptions,  expSeparate = false,): number | number[] {  if (typeof optOrExp === "undefined") {    return getRandom(6);  } else if (typeof optOrExp === "string") {    const { times, face, modifier } = parseExpression(optOrExp);    if (modifier && expSeparate) {      throw new Error("Cannot add a modifier when rolling dice separately.");    }    if (times === 1) return getRandom(face);    else {      if (!expSeparate) {        let res = 0;        let i = 0;        while (i < times) {          res += getRandom(face);          i += 1;        }        return res + modifier;      } else {        const res = new Array(times);        let i = 0;        while (i < times) {          res[i] = getRandom(face);          i += 1;        }        return res;      }    }  } else if (typeof optOrExp === "object") {    const { times, face, separate, modifier } = {      ...defaultRollOptions,      ...optOrExp,    };    if (!times) throw new Error("Invalid value for `times`.");    if (times === 1) return getRandom(face || 6);    else {      if (!separate) {        let res = 0;        let i = 0;        while (i < times) {          res += getRandom(face || 6);          i += 1;        }        return res + (modifier || 0);      } else {        if (modifier) {          throw new Error(            "Cannot add a modifier when rolling dice separately.",          );        }        const res = new Array(times);        let i = 0;        while (i < times) {          res[i] = getRandom(face || 6);          i += 1;        }        return res;      }    }  } else {    throw new Error(`Paramaters are not of the required format.`);  }}
function getRandom(n: number) {  return Math.floor(Math.random() * n) + 1;}