Make it clearer what the tar code does

src/cli.ts

@@ -8,7 +8,7 @@ import pkg from "vs/platform/product/node/package";
 import product from "vs/platform/product/node/product";
 
 import { MainServer } from "vs/server/src/server";
-import "vs/server/src/tar";
+import { enableExtensionTars } from "vs/server/src/tar";
 import { AuthType, buildAllowedMessage, generateCertificate, generatePassword, localRequire, open, unpackExecutables } from "vs/server/src/util";
 
 const { logger } = localRequire<typeof import("@coder/logger/out/index")>("@coder/logger/out/index");
@@ -96,6 +96,8 @@ const main = async (): Promise<void | void[]> => {
 		return buildVersionMessage(version, product.commit).split("\n").map((line) => logger.info(line));
 	}
 
+	enableExtensionTars();
+
 	const shouldSpawnCliProcess = (): boolean => {
 		return !!args["install-source"]
 			|| !!args["list-extensions"]

src/tar.ts

@@ -153,8 +153,13 @@ const extractTar = async (tarPath: string, targetPath: string, options: IExtract
 	});
 };
 
-// Override original functionality so we can use tar instead of zip.
-const target = vszip as typeof vszip;
-target.zip = tar;
-target.extract = extract;
-target.buffer = buffer;
+/**
+ * Override original functionality so we can use extensions that are in a tar in
+ * addition to zips.
+ */
+export const enableExtensionTars = (): void => {
+	const target = vszip as typeof vszip;
+	target.zip = tar;
+	target.extract = extract;
+	target.buffer = buffer;
+};