@yobta/validator/lib/array/unique.js

Tree-shakable es6 validator

import { rule } from '../rule/rule.js';
export const uniqueMessage = 'It should contain unique items';
export function unique(message = uniqueMessage) {
    return rule((input) => {
        if (!input || new Set(input).size === input.length) {
            return input;
        }
        throw new Error(message);
    });
}