diff --git a/src/FileSystemHandle.js b/src/FileSystemHandle.js
index 2bab58b..6d7976e 100644
--- a/src/FileSystemHandle.js
+++ b/src/FileSystemHandle.js
@@ -18,6 +18,7 @@ class FileSystemHandle {
 
   async queryPermission ({mode = 'read'} = {}) {
     const handle = this[kAdapter]
+
     if (handle.queryPermission) {
       return handle.queryPermission({mode})
     }
diff --git a/src/adapters/deno.js b/src/adapters/deno.js
index 01e3294..12296e9 100644
--- a/src/adapters/deno.js
+++ b/src/adapters/deno.js
@@ -116,11 +116,13 @@ export class FileHandle {
     return this.#path
   }
 
-  async createWritable () {
-    const fileHandle = await Deno.open(this.#path, {write: true}).catch(err => {
+  /** @param {{ keepExistingData: any; }} opts */
+  async createWritable (opts) {
+    const fileHandle = await Deno.open(this.#path, { write: true, truncate: !opts.keepExistingData }).catch(err => {
       if (err.name === 'NotFound') throw new DOMException(...GONE)
       throw err
     })
+
     const { size } = await fileHandle.stat()
     return new Sink(fileHandle, size)
   }