fix memory leak when using createReadStream

lib/serialization/FileMiddleware.js

@@ -435,18 +435,25 @@ class FileMiddleware extends SerializerMiddleware {
 				const file = name
 					? join(this.fs, filename, `../${name}${extension}`)
 					: filename;
-				const stream = this.fs.createReadStream(file, {
-					highWaterMark: 500 * 1024 * 1024 // 500 MB
-				});
-				const buf = [];
-				stream.on("data", data => {
-					buf.push(data);
-				});
-				stream.on("end", () => {
-					resolve(buf);
-				});
-				stream.on("error", err => {
-					reject(err);
+				this.fs.stat(file, (err, stats) => {
+					if (err) {
+						reject(err);
+						return;
+					}
+					const stream = this.fs.createReadStream(file, {
+						end: stats.size,
+						highWaterMark: stats.size // 500 MB
+					});
+					const buf = [];
+					stream.on("data", data => {
+						buf.push(data);
+					});
+					stream.on("end", () => {
+						resolve(buf);
+					});
+					stream.on("error", err => {
+						reject(err);
+					});
 				});
 			});
 		return deserialize(this, false, readFile);

lib/util/fs.js

@@ -73,7 +73,7 @@ const path = require("path");
  * @typedef {Object} IntermediateFileSystemExtras
  * @property {function(string): void} mkdirSync
  * @property {function(string): import("fs").WriteStream} createWriteStream
- * @property {function(string, { highWaterMark?: number }): import("fs").ReadStream} createReadStream
+ * @property {function(string, { highWaterMark?: number, end?: number }): import("fs").ReadStream} createReadStream
  * @property {function(string, string, Callback): void} rename
  */
 

types.d.ts

@@ -3692,7 +3692,7 @@ declare interface IntermediateFileSystemExtras {
 	createWriteStream: (arg0: string) => WriteStream;
 	createReadStream: (
 		arg0: string,
-		arg1: { highWaterMark?: number }
+		arg1: { highWaterMark?: number; end?: number }
 	) => ReadStream;
 	rename: (
 		arg0: string,