Method unique

packages/svelte/src/compiler/phases/scope.js:891–912

* @param {string} preferred_name

(preferred_name)

	 * @param {string} preferred_name
	 */
	unique(preferred_name) {
		preferred_name = preferred_name.replace(/[^a-zA-Z0-9_$]/g, '_');
		let n = this.#name_counters.get(preferred_name) ?? 0;
		let final_name;

		if (n === 0) {
			final_name = preferred_name;
			n = 1;
		} else {
			final_name = `${preferred_name}_${n}`;
			n++;
		}

		while (this.conflicts.has(final_name)) {
			final_name = `${preferred_name}_${n++}`;
		}

		this.#name_counters.set(preferred_name, n);
		this.conflicts.add(final_name);
		const id = b.id(final_name);
		return id;
	}
}

/**