Fix koa-compress memory leak

app.js

@@ -21,6 +21,7 @@ import share from './routes/share.js';
 import { slack, oauth } from './routes/slack.js';
 import errorHandler from './lib/error-handler.js';
 import newrelic from 'newrelic';
+import { constants }  from 'zlib'
 
 const debug = debuglog('combine.fm');
 
@@ -55,7 +56,19 @@ app.use(errorHandler(Sentry));
 
 app.use(bodyparser());
 app.use(cors());
-app.use(compress({ flush: zlib.Z_SYNC_FLUSH }));
+app.use(compress({ 
+  filter (content_type) {
+  	return /text/i.test(content_type)
+  },
+  threshold: 2048,
+  gzip: {
+    flush: constants.Z_SYNC_FLUSH
+  },
+  deflate: {
+    flush: constants.Z_SYNC_FLUSH,
+  },
+  br: false
+ }));
 app.use(favicon(path.join(__dirname, '/public/assets/images/favicon.png')));
 app.use(logger());
 app.use(serve('public', { maxage: 31536000000 }));