diff --git a/packages/server/src/SettingConfig.ts b/packages/server/src/SettingConfig.ts
index a59944e..fe08b33 100644
--- a/packages/server/src/SettingConfig.ts
+++ b/packages/server/src/SettingConfig.ts
@@ -1,6 +1,6 @@
 import { randomBytes } from "node:crypto";
 import { existsSync, readFileSync, writeFileSync } from "node:fs";
-import type { Permission } from "./permission/permission";
+import type { Permission } from "./permission/permission.ts";
 
 export interface SettingConfig {
 	/**
diff --git a/packages/server/src/database.ts b/packages/server/src/database.ts
index 997fe9f..725d947 100644
--- a/packages/server/src/database.ts
+++ b/packages/server/src/database.ts
@@ -1,6 +1,4 @@
-import { existsSync } from "node:fs";
-import { get_setting } from "./SettingConfig";
-import { getKysely } from "./db/kysely";
+import { getKysely } from "./db/kysely.ts";
 
 export async function connectDB() {
 	const kysely = getKysely();
diff --git a/packages/server/src/diff/content_list.ts b/packages/server/src/diff/content_list.ts
index 9e3f7f8..600a581 100644
--- a/packages/server/src/diff/content_list.ts
+++ b/packages/server/src/diff/content_list.ts
@@ -1,4 +1,4 @@
-import type { ContentFile } from "../content/mod";
+import type { ContentFile } from "../content/mod.ts";
 
 export class ContentList {
 	/** path map */
diff --git a/packages/server/src/diff/diff.ts b/packages/server/src/diff/diff.ts
index 3f69f50..eeea3cb 100644
--- a/packages/server/src/diff/diff.ts
+++ b/packages/server/src/diff/diff.ts
@@ -1,7 +1,7 @@
 import asyncPool from "tiny-async-pool";
-import type { DocumentAccessor } from "../model/doc";
-import { ContentDiffHandler } from "./content_handler";
-import type { IDiffWatcher } from "./watcher";
+import type { DocumentAccessor } from "../model/doc.ts";
+import { ContentDiffHandler } from "./content_handler.ts";
+import type { IDiffWatcher } from "./watcher.ts";
 
 export class DiffManager {
 	watching: { [content_type: string]: ContentDiffHandler };
diff --git a/packages/server/src/diff/router.ts b/packages/server/src/diff/router.ts
index 41ab912..c3be4f2 100644
--- a/packages/server/src/diff/router.ts
+++ b/packages/server/src/diff/router.ts
@@ -1,9 +1,9 @@
 import type Koa from "koa";
 import Router from "koa-router";
-import type { ContentFile } from "../content/mod";
-import { AdminOnlyMiddleware } from "../permission/permission";
-import { sendError } from "../route/error_handler";
-import type { DiffManager } from "./diff";
+import type { ContentFile } from "../content/mod.ts";
+import { AdminOnlyMiddleware } from "../permission/permission.ts";
+import { sendError } from "../route/error_handler.ts";
+import type { DiffManager } from "./diff.ts";
 
 function content_file_to_return(x: ContentFile) {
 	return { path: x.path, type: x.type };
diff --git a/packages/server/src/diff/watcher.ts b/packages/server/src/diff/watcher.ts
index 70b01c8..62e306a 100644
--- a/packages/server/src/diff/watcher.ts
+++ b/packages/server/src/diff/watcher.ts
@@ -2,7 +2,7 @@ import type event from "node:events";
 import { FSWatcher, watch } from "node:fs";
 import { promises } from "node:fs";
 import { join } from "node:path";
-import type { DocumentAccessor } from "../model/doc";
+import type { DocumentAccessor } from "../model/doc.ts";
 
 const readdir = promises.readdir;
 
diff --git a/packages/server/src/permission/permission.ts b/packages/server/src/permission/permission.ts
index 8229316..4632ef6 100644
--- a/packages/server/src/permission/permission.ts
+++ b/packages/server/src/permission/permission.ts
@@ -1,6 +1,6 @@
 import type Koa from "koa";
-import type { UserState } from "../login";
-import { sendError } from "../route/error_handler";
+import type { UserState } from "../login.ts";
+import { sendError } from "../route/error_handler.ts";
 
 export enum Permission {
 	// ========
diff --git a/packages/server/src/util/oshash.ts b/packages/server/src/util/oshash.ts
index 3584e0a..92a6a45 100644
--- a/packages/server/src/util/oshash.ts
+++ b/packages/server/src/util/oshash.ts
@@ -24,19 +24,21 @@ export async function oshash(
     }
 
     // read first and last chunk
-    const firstChunk = Buffer.alloc(chunkSize);
+    const firstChunk = new Uint8Array(chunkSize);
     await fd.read(firstChunk, 0, chunkSize, 0);
-    const lastChunk = Buffer.alloc(chunkSize);
+    const lastChunk = new Uint8Array(chunkSize);
     await fd.read(lastChunk, 0, chunkSize, st.size - chunkSize);
     // iterate over first and last chunk.
     // for each uint64_t, add it to the hash.
+    const firstChunkView = new DataView(firstChunk.buffer);
     for (let i = 0; i < chunkSize; i += 8){
-        hash += firstChunk.readBigUInt64LE(i);
+        hash += firstChunkView.getBigUint64(i, true);
         // prevent overflow
         hash = (hash & 0xFFFFFFFFFFFFFFFFn);
     }
+    const lastChunkView = new DataView(lastChunk.buffer);
     for (let i = 0; i < chunkSize; i += 8){
-        hash += lastChunk.readBigUInt64LE(i);
+        hash += lastChunkView.getBigUint64(i, true);
         // prevent overflow
         hash = (hash & 0xFFFFFFFFFFFFFFFFn);
     }