Class SvelteURLSearchParams

packages/svelte/src/reactivity/url-search-params.js:35–190

 * ```
 */
export class SvelteURLSearchParams extends URLSearchParams {
	#version = DEV ? tag(state(0), 'SvelteURLSearchParams version') : state(0);
	#url = get_current_url();

	#updating = false;

	#update_url() {
		if (!this.#url || this.#updating) return;
		this.#updating = true;

		const search = this.toString();
		this.#url.search = search && `?${search}`;

		this.#updating = false;
	}

	/**
	 * @param {URLSearchParams} params
	 * @internal
	 */
	[REPLACE](params) {
		if (this.#updating) return;

		// the URL may have changed in a way that leaves the search string untouched —
		// don't rebuild the params or notify readers if nothing changed
		if (params.toString() === super.toString()) return;

		this.#updating = true;

		for (const key of [...super.keys()]) {
			super.delete(key);
		}

		for (const [key, value] of params) {
			super.append(key, value);
		}

		increment(this.#version);
		this.#updating = false;
	}

	/**
	 * @param {string} name
	 * @param {string} value
	 * @returns {void}
	 */
	append(name, value) {
		super.append(name, value);
		this.#update_url();
		increment(this.#version);
	}

	/**
	 * @param {string} name
	 * @param {string=} value
	 * @returns {void}
	 */
	delete(name, value) {