drab/dist/util/validate.js

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/**
 * @param actual Element to validate.
 * @param expected Constructor of the expected element.
 * @returns If valid returns `actual` otherwise throws `TypeError`.
 */
export const validate = (actual, expected) => {
    if (!(actual instanceof expected))
        throw new TypeError(`${actual} is not an instance of ${expected.name}.`);
    return actual;
};