@seroh/roll/dist/mechanic/RerollMechanic.js

An RPG dice-rolling library with a variety of built-in roll mechanics.

import { Mechanic } from "./Mechanic";
export class RerollMechanic extends Mechanic {
    options;
    constructor(options) {
        super();
        this.options = options;
        this.options.maxRerollCount = options.maxRerollCount ?? 1;
        this.validateOptions(options);
    }
    do(min, max, randomizer) {
        const rolls = [];
        let result = randomizer.generate(min, max);
        let remainingRerolls = this.options.maxRerollCount ?? 0;
        rolls.push(result);
        while (this.options.target.includes(result) && remainingRerolls > 0) {
            result = randomizer.generate(min, max);
            rolls.push(result);
            remainingRerolls--;
        }
        return { result, rolls };
    }
    validateOptions({ target: target, maxRerollCount: times }) {
        if (target.length === 0) {
            throw new Error("Target can not be an empty array.");
        }
        if (target.some((target) => typeof target !== "number")) {
            throw new Error("All values in the target array must be numbers.");
        }
        if (typeof times !== "number" || !Number.isInteger(times) || times <= 0) {
            throw new Error("Times must be a positive integer.");
        }
    }
}
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