@yobta/validator/lib/number/integer.js

Tree-shakable es6 validator

import { rule } from '../rule/rule.js';
export const integerMessage = 'It should be an integer';
export const integer = (message = integerMessage) => rule((input) => {
    if (input === undefined || Number.isInteger(input)) {
        return input;
    }
    throw new Error(message);
});