another typo: null != undefined.

filter.js

@@ -2,15 +2,16 @@ export function matchFilter(filter, event) {
   if (filter.id && event.id !== filter.id) return false
   if (filter.kind && event.kind !== filter.kind) return false
   if (filter.author && event.pubkey !== filter.author) return false
-  if (filter.authors && filter.author.indexOf(event.pubkey) === -1) return false
+  if (filter.authors && filter.authors.indexOf(event.pubkey) === -1)
+    return false
   if (
     filter['#e'] &&
-    event.tags.find(([t, v]) => t === 'e' && v === filter['#e']) === null
+    !event.tags.find(([t, v]) => t === 'e' && v === filter['#e'])
   )
     return false
   if (
     filter['#p'] &&
-    event.tags.find(([t, v]) => t === 'p' && v === filter['#p']) === null
+    !event.tags.find(([t, v]) => t === 'p' && v === filter['#p'])
   )
     return false
   if (filter.since && event.created_at <= filter.since) return false

package.json

@@ -1,6 +1,6 @@
 {
   "name": "nostr-tools",
-  "version": "0.10.1",
+  "version": "0.10.3",
   "description": "Tools for making a Nostr client.",
   "repository": {
     "type": "git",