export function applyMixins(derivedCtor: any, baseCtors: any[]) {
    baseCtors.forEach(baseCtor => {
        Object.getOwnPropertyNames(baseCtor.prototype).forEach(name => {
            const desc = Object.getOwnPropertyDescriptor(baseCtor.prototype, name)
            if ( typeof desc !== 'undefined' )
                Object.defineProperty(derivedCtor.prototype, name, desc)
        })
    })
}