From 0897f7a545906e64e5bc734faf91d7a26b79cfdb Mon Sep 17 00:00:00 2001
From: Andras Schmelczer <andras@schmelczer.dev>
Date: Wed, 1 Apr 2026 22:29:57 +0100
Subject: [PATCH] Make hash async

---
 frontend/sync-client/src/utils/find-matching-file.ts | 12 ++++++------
 frontend/sync-client/src/utils/hash.ts               |  8 ++++++--
 2 files changed, 12 insertions(+), 8 deletions(-)

diff --git a/frontend/sync-client/src/utils/find-matching-file.ts b/frontend/sync-client/src/utils/find-matching-file.ts
index c3d323d3..67b89876 100644
--- a/frontend/sync-client/src/utils/find-matching-file.ts
+++ b/frontend/sync-client/src/utils/find-matching-file.ts
@@ -1,14 +1,14 @@
-import type { DocumentRecord } from "../persistence/database";
+import type { DocumentRecord, RelativePath } from "../sync-operations/types";
 import { EMPTY_HASH } from "./hash";
 
 // TODO: make this smarter so that offline files can be renamed & edited at the same time
-export function findMatchingFile(
+export async function findMatchingFile(
     contentHash: string,
-    candidates: DocumentRecord[]
-): DocumentRecord | undefined {
-    if (contentHash === EMPTY_HASH) {
+    candidates: { path: RelativePath; record: DocumentRecord }[]
+): Promise<{ path: RelativePath; record: DocumentRecord } | undefined> {
+    if (contentHash === await EMPTY_HASH) {
         return undefined;
     }
 
-    return candidates.find(({ metadata }) => metadata?.hash === contentHash);
+    return candidates.find(({ record }) => record.hash === contentHash);
 }
diff --git a/frontend/sync-client/src/utils/hash.ts b/frontend/sync-client/src/utils/hash.ts
index 814faefa..933929c5 100644
--- a/frontend/sync-client/src/utils/hash.ts
+++ b/frontend/sync-client/src/utils/hash.ts
@@ -1,7 +1,11 @@
 export async function hash(content: Uint8Array): Promise<string> {
-    const digest = await crypto.subtle.digest("SHA-256", content);
+    const digest = await crypto.subtle.digest(
+        "SHA-256",
+        content as Uint8Array<ArrayBuffer>
+    );
     const bytes = new Uint8Array(digest);
     return Array.from(bytes, (b) => b.toString(16).padStart(2, "0")).join("");
 }
 
-export const EMPTY_HASH = await hash(new Uint8Array(0));
+// SHA-256 of empty content, computed once at import time
+export const EMPTY_HASH: Promise<string> = hash(new Uint8Array());