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app_vue/node_modules/webpack/lib/serialization/PlainObjectSerializer.js

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+/*
+	MIT License http://www.opensource.org/licenses/mit-license.php
+*/
+
+"use strict";
+
+/** @typedef {import("./ObjectMiddleware").ObjectDeserializerContext} ObjectDeserializerContext */
+/** @typedef {import("./ObjectMiddleware").ObjectSerializerContext} ObjectSerializerContext */
+
+/** @typedef {EXPECTED_FUNCTION} CacheAssoc */
+
+/**
+ * @template T
+ * @typedef {WeakMap<CacheAssoc, ObjectStructure<T>>}
+ */
+const cache = new WeakMap();
+
+/**
+ * @template T
+ */
+class ObjectStructure {
+	constructor() {
+		this.keys = undefined;
+		this.children = undefined;
+	}
+
+	/**
+	 * @param {keyof T[]} keys keys
+	 * @returns {keyof T[]} keys
+	 */
+	getKeys(keys) {
+		if (this.keys === undefined) this.keys = keys;
+		return this.keys;
+	}
+
+	/**
+	 * @param {keyof T} key key
+	 * @returns {ObjectStructure<T>} object structure
+	 */
+	key(key) {
+		if (this.children === undefined) this.children = new Map();
+		const child = this.children.get(key);
+		if (child !== undefined) return child;
+		const newChild = new ObjectStructure();
+		this.children.set(key, newChild);
+		return newChild;
+	}
+}
+
+/**
+ * @template T
+ * @param {(keyof T)[]} keys keys
+ * @param {CacheAssoc} cacheAssoc cache assoc fn
+ * @returns {(keyof T)[]} keys
+ */
+const getCachedKeys = (keys, cacheAssoc) => {
+	let root = cache.get(cacheAssoc);
+	if (root === undefined) {
+		root = new ObjectStructure();
+		cache.set(cacheAssoc, root);
+	}
+	let current = root;
+	for (const key of keys) {
+		current = current.key(key);
+	}
+	return current.getKeys(keys);
+};
+
+class PlainObjectSerializer {
+	/**
+	 * @template {object} T
+	 * @param {T} obj plain object
+	 * @param {ObjectSerializerContext} context context
+	 */
+	serialize(obj, context) {
+		const keys = /** @type {(keyof T)[]} */ (Object.keys(obj));
+		if (keys.length > 128) {
+			// Objects with so many keys are unlikely to share structure
+			// with other objects
+			context.write(keys);
+			for (const key of keys) {
+				context.write(obj[key]);
+			}
+		} else if (keys.length > 1) {
+			context.write(getCachedKeys(keys, context.write));
+			for (const key of keys) {
+				context.write(obj[key]);
+			}
+		} else if (keys.length === 1) {
+			const key = keys[0];
+			context.write(key);
+			context.write(obj[key]);
+		} else {
+			context.write(null);
+		}
+	}
+
+	/**
+	 * @template {object} T
+	 * @param {ObjectDeserializerContext} context context
+	 * @returns {T} plain object
+	 */
+	deserialize(context) {
+		const keys = context.read();
+		const obj = /** @type {T} */ ({});
+		if (Array.isArray(keys)) {
+			for (const key of keys) {
+				obj[/** @type {keyof T} */ (key)] = context.read();
+			}
+		} else if (keys !== null) {
+			obj[/** @type {keyof T} */ (keys)] = context.read();
+		}
+		return obj;
+	}
+}
+
+module.exports = PlainObjectSerializer;