@grail-ui/svelte/dist/numberInput/numberInput.utils.js

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export function observeElement(element, property, callback, delay = 0) {
    const elementPrototype = Object.getPrototypeOf(element);
    // eslint-disable-next-line no-prototype-builtins
    if (elementPrototype.hasOwnProperty(property)) {
        const descriptor = Object.getOwnPropertyDescriptor(elementPrototype, property);
        Object.defineProperty(element, property, {
            get: function () {
                // eslint-disable-next-line prefer-rest-params
                return descriptor?.get?.apply(this, arguments);
            },
            set: function () {
                const oldValue = this[property];
                // eslint-disable-next-line prefer-rest-params
                descriptor?.set?.apply(this, arguments);
                const newValue = this[property];
                if (typeof callback == 'function') {
                    setTimeout(callback.bind(this, oldValue, newValue), delay);
                }
                return newValue;
            },
            configurable: true,
        });
    }
}