Add PowWorker to mine Nostr events off the main thread

package.json

@@ -99,6 +99,7 @@
     "bowser": "^2.11.0",
     "browserslist": "^4.16.6",
     "clsx": "^2.0.0",
+    "comlink": "^4.4.1",
     "core-js": "^3.27.2",
     "cryptocurrency-icons": "^0.18.1",
     "cssnano": "^6.0.0",

src/workers.ts

@@ -0,0 +1,9 @@
+import * as Comlink from 'comlink';
+
+import type { PowWorker } from './workers/pow.worker';
+
+const powWorker = Comlink.wrap<typeof PowWorker>(
+  new Worker(new URL('./workers/pow.worker.ts', import.meta.url), { type: 'module' }),
+);
+
+export { powWorker };

src/workers/pow.worker.ts

@@ -0,0 +1,10 @@
+import * as Comlink from 'comlink';
+import { nip13, type UnsignedEvent } from 'nostr-tools';
+
+export const PowWorker = {
+  mine<K extends number>(event: UnsignedEvent<K>, difficulty: number) {
+    return nip13.minePow(event, difficulty);
+  },
+};
+
+Comlink.expose(PowWorker);

yarn.lock

@@ -3566,6 +3566,11 @@ combined-stream@^1.0.8:
   dependencies:
     delayed-stream "~1.0.0"
 
+comlink@^4.4.1:
+  version "4.4.1"
+  resolved "https://registry.yarnpkg.com/comlink/-/comlink-4.4.1.tgz#e568b8e86410b809e8600eb2cf40c189371ef981"
+  integrity sha512-+1dlx0aY5Jo1vHy/tSsIGpSkN4tS9rZSW8FIhG0JH/crs9wwweswIo/POr451r7bZww3hFbPAKnTpimzL/mm4Q==
+
 commander@^2.20.0:
   version "2.20.3"
   resolved "https://registry.yarnpkg.com/commander/-/commander-2.20.3.tgz#fd485e84c03eb4881c20722ba48035e8531aeb33"