vscode: switched to more recent node 10 pipeline api

Author: Veetaha

editors/code/src/installation/download_file.ts

@@ -1,7 +1,11 @@
 import fetch from "node-fetch";
 import * as fs from "fs";
+import * as stream from "stream";
+import * as util from "util";
 import { strict as assert } from "assert";
 
+const pipeline = util.promisify(stream.pipeline);
+
 /**
  * Downloads file from `url` and stores it at `destFilePath`.
  * `onProgress` callback is called on recieveing each chunk of bytes
@@ -18,16 +22,14 @@ export async function downloadFile(
     const totalBytes = Number(response.headers.get('content-length'));
     assert(!Number.isNaN(totalBytes), "Sanity check of content-length protocol");
 
+    console.log("Downloading file of", totalBytes, "bytes size from", url, "to", destFilePath);
+
     let readBytes = 0;
 
-    console.log("Downloading file of", totalBytes, "bytes size from", url, "to", destFilePath);
+    response.body.on("data", (chunk: Buffer) => {
+        readBytes += chunk.length;
+        onProgress(readBytes, totalBytes);
+    });
 
-    return new Promise<void>((resolve, reject) => response.body
-        .on("data", (chunk: Buffer) => {
-            readBytes += chunk.length;
-            onProgress(readBytes, totalBytes);
-        })
-        .on("error", reject)
-        .pipe(fs.createWriteStream(destFilePath).on("close", resolve))
-    );
+    await pipeline(response.body, fs.createWriteStream(destFilePath));
 }