Use promisify for gzip

extensions/ql-vscode/src/common/zlib.ts

@@ -1,43 +1,12 @@
-import { gzip, gunzip, InputType as ZlibInputType, ZlibOptions } from "zlib";
+import { promisify } from "util";
+import { gzip, gunzip } from "zlib";
 
 /**
  * Promisified version of zlib.gzip
- * @param buffer Buffer to compress
- * @param options zlib options
  */
-export function gzipEncode(
-  buffer: ZlibInputType,
-  options: ZlibOptions = {},
-): Promise<Buffer> {
-  return new Promise((resolve, reject) => {
-    gzip(buffer, options, (error, result) => {
-      if (error) {
-        reject(error);
-        return;
-      }
-
-      resolve(result);
-    });
-  });
-}
+export const gzipEncode = promisify(gzip);
 
 /**
  * Promisified version of zlib.gunzip
- * @param buffer Buffer to decompress
- * @param options zlib options
  */
-export function gzipDecode(
-  buffer: ZlibInputType,
-  options: ZlibOptions = {},
-): Promise<Buffer> {
-  return new Promise((resolve, reject) => {
-    gunzip(buffer, options, (error, result) => {
-      if (error) {
-        reject(error);
-        return;
-      }
-
-      resolve(result);
-    });
-  });
-}
+export const gzipDecode = promisify(gunzip);