fix: failing type check

Note: filter on Array<T> does refine T type.

Author: Gozala

packages/ipfs-grpc-server/src/endpoints/add.js

@@ -56,7 +56,6 @@ module.exports = function grpcAdd (ipfs, options = {}) {
 
               if (!stream) {
                 // start of new file
-                // @ts-ignore
                 stream = streams[index] = pushable()
 
                 fileInputStream.push({
@@ -83,7 +82,7 @@ module.exports = function grpcAdd (ipfs, options = {}) {
             fileInputStream.end(err)
           } finally {
             // clean up any open streams
-            streams.filter(Boolean).forEach(stream => stream.end())
+            streams.forEach(stream => stream && stream.end())
           }
         }, 0)