SharedPointer.js: sync with other projects

see medooze/media-server-node#261 and the fixups in master afterwards

lib/SharedPointer.js

@@ -1,3 +1,5 @@
+//@ts-nocheck
+
 function proxy(ret,cache)
 {
 	if (typeof ret === "object" && ret.constructor.name.match(/_exports_(.*)Shared/))
@@ -39,11 +41,30 @@ class Handler
 };
 
 
-function SharedPointer(obj, cache)
+/**
+ * @template {{ get(): any }} T
+ * @typedef {T & ReturnType<T['get']>} Proxy
+ *
+ * objects returned by {@link SharedPointer} are proxies that
+ * implement both the operations of the shared pointer itself
+ * and of the pointed-to object. they can be used in place of
+ * both.
+ */
+
+/**
+ * @template {{ get(): any }} T
+ * @returns {Proxy<T>}
+ */
+function SharedPointer(
+	/** @type {T} */ obj,
+	/** @type {Map<Object, Proxy<any>>} */ cache)
 {
+	//If what we get passed is already a proxy, return it unchanged
+	if (obj[SharedPointer.Target])
+		return obj;
 	//If we already have a proxy for that object
 	if (cache && cache.has(obj))
-		//Return 
+		//Return
 		return cache.get(obj)
 	//Create new proxy
 	const proxy  = new Proxy(obj, new Handler());
@@ -57,6 +78,17 @@ function SharedPointer(obj, cache)
 SharedPointer.Target = Symbol("target");
 SharedPointer.Pointer = Symbol("pointer");
 
+/**
+ * @template {{ get(): any }} T
+ * @param {Proxy<T>} ptr
+ * @returns {T}
+ */
+SharedPointer.getPointer = function (ptr)
+{
+	return ptr[SharedPointer.Pointer];
+}
+
+
 
 SharedPointer.wrapNativeModule = function (module)
 {
@@ -68,9 +100,3 @@ SharedPointer.wrapNativeModule = function (module)
 }
 
 module.exports = SharedPointer;
-
-
-
-
-
-