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remotion/node_modules/webpack/lib/util/AppendOnlyStackedSet.js

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+/*
+	MIT License http://www.opensource.org/licenses/mit-license.php
+	Author Ivan Kopeykin @vankop
+*/
+
+"use strict";
+
+/**
+ * @template T
+ */
+class AppendOnlyStackedSet {
+	/**
+	 * @param {Set<T>[]} sets an optional array of sets
+	 */
+	constructor(sets = []) {
+		/** @type {Set<T>[]} */
+		this._sets = sets;
+		/** @type {Set<T> | undefined} */
+		this._current = undefined;
+	}
+
+	/**
+	 * @param {T} el element
+	 */
+	add(el) {
+		if (!this._current) {
+			this._current = new Set();
+			this._sets.push(this._current);
+		}
+		this._current.add(el);
+	}
+
+	/**
+	 * @param {T} el element
+	 * @returns {boolean} result
+	 */
+	has(el) {
+		for (const set of this._sets) {
+			if (set.has(el)) return true;
+		}
+		return false;
+	}
+
+	clear() {
+		this._sets = [];
+		if (this._current) this._current.clear();
+	}
+
+	/**
+	 * @returns {AppendOnlyStackedSet<T>} child
+	 */
+	createChild() {
+		return new AppendOnlyStackedSet(this._sets.length ? [...this._sets] : []);
+	}
+}
+
+module.exports = AppendOnlyStackedSet;