diff --git a/package.json b/package.json
index 94de166..a94a4e8 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "native-file-system-adapter",
-  "version": "1.0.0",
+  "version": "1.0.1",
   "description": "Native File System API",
   "main": "src/es6.js",
   "module": "./src/es6.js",
diff --git a/src/FileSystemDirectoryHandle.js b/src/FileSystemDirectoryHandle.js
index caeca06..d84de91 100644
--- a/src/FileSystemDirectoryHandle.js
+++ b/src/FileSystemDirectoryHandle.js
@@ -1,13 +1,15 @@
 import FileSystemHandle from './FileSystemHandle.js'
 import FileSystemFileHandle from './FileSystemFileHandle.js'
 
+const kAdapter = Symbol('adapter')
+
 class FileSystemDirectoryHandle extends FileSystemHandle {
   /** @type {FileSystemDirectoryHandle} */
-  #adapter
+  [kAdapter]
 
   constructor (adapter) {
     super(adapter)
-    this.#adapter = adapter
+    this[kAdapter] = adapter
   }
 
   /**
@@ -19,19 +21,19 @@ class FileSystemDirectoryHandle extends FileSystemHandle {
   async getDirectoryHandle (name, options = {}) {
     if (name === '') throw new TypeError(`Name can't be an empty string.`)
     if (name === '.' || name === '..' || name.includes('/')) throw new TypeError(`Name contains invalid characters.`)
-    return new FileSystemDirectoryHandle(await this.#adapter.getDirectoryHandle(name, options))
+    return new FileSystemDirectoryHandle(await this[kAdapter].getDirectoryHandle(name, options))
   }
 
   /** @returns {AsyncGenerator<[string, FileSystemHandle], void, unknown>} */
   async * entries () {
-    for await (const [_, entry] of this.#adapter.entries())
+    for await (const [_, entry] of this[kAdapter].entries())
       yield [entry.name, entry.kind === 'file' ? new FileSystemFileHandle(entry) : new FileSystemDirectoryHandle(entry)]
   }
 
   /** @deprecated use .entries() instead */
   async * getEntries() {
     console.warn('deprecated, use .entries() instead')
-    for await (let entry of this.#adapter.entries())
+    for await (let entry of this[kAdapter].entries())
       yield entry.kind === 'file' ? new FileSystemFileHandle(entry) : new FileSystemDirectoryHandle(entry)
   }
 
@@ -45,7 +47,7 @@ class FileSystemDirectoryHandle extends FileSystemHandle {
     if (name === '') throw new TypeError(`Name can't be an empty string.`)
     if (name === '.' || name === '..' || name.includes('/')) throw new TypeError(`Name contains invalid characters.`)
     options.create = !!options.create
-    return new FileSystemFileHandle(await this.#adapter.getFileHandle(name, options))
+    return new FileSystemFileHandle(await this[kAdapter].getFileHandle(name, options))
   }
 
   /**
@@ -57,7 +59,7 @@ class FileSystemDirectoryHandle extends FileSystemHandle {
     if (name === '') throw new TypeError(`Name can't be an empty string.`)
     if (name === '.' || name === '..' || name.includes('/')) throw new TypeError(`Name contains invalid characters.`)
     options.recursive = !!options.recursive // cuz node's fs.rm require boolean
-    return this.#adapter.removeEntry(name, options)
+    return this[kAdapter].removeEntry(name, options)
   }
 
   [Symbol.asyncIterator]() {
diff --git a/src/FileSystemFileHandle.js b/src/FileSystemFileHandle.js
index c24e35a..47ac490 100644
--- a/src/FileSystemFileHandle.js
+++ b/src/FileSystemFileHandle.js
@@ -1,13 +1,15 @@
 import FileSystemHandle from './FileSystemHandle.js'
 import FileSystemWritableFileStream from './FileSystemWritableFileStream.js'
 
+const kAdapter = Symbol('adapter')
+
 class FileSystemFileHandle extends FileSystemHandle {
   /** @type {FileSystemFileHandle} */
-  #adapter
+  [kAdapter]
 
   constructor (adapter) {
     super(adapter)
-    this.#adapter = adapter
+    this[kAdapter] = adapter
   }
 
   /**
@@ -17,7 +19,7 @@ class FileSystemFileHandle extends FileSystemHandle {
    */
   async createWritable (options = {}) {
     return new FileSystemWritableFileStream(
-      await this.#adapter.createWritable(options)
+      await this[kAdapter].createWritable(options)
     )
   }
 
@@ -25,7 +27,7 @@ class FileSystemFileHandle extends FileSystemHandle {
    * @returns {Promise<File>}
    */
   getFile () {
-    return Promise.resolve(this.#adapter.getFile())
+    return Promise.resolve(this[kAdapter].getFile())
   }
 }
 
diff --git a/src/FileSystemHandle.js b/src/FileSystemHandle.js
index 8d8b060..3bb1516 100644
--- a/src/FileSystemHandle.js
+++ b/src/FileSystemHandle.js
@@ -1,8 +1,8 @@
-const wm = new WeakMap()
+const kAdapter = Symbol('adapter')
 
 class FileSystemHandle {
   /** @type {FileSystemHandle} */
-  #adapter
+  [kAdapter]
 
   /** @type {string} */
   name
@@ -13,12 +13,12 @@ class FileSystemHandle {
   constructor (adapter) {
     this.kind = adapter.kind
     this.name = adapter.name
-    this.#adapter = adapter
+    this[kAdapter] = adapter
   }
 
   async queryPermission (options = {}) {
     if (options.readable) return 'granted'
-    const handle = this.#adapter
+    const handle = this[kAdapter]
     return handle.queryPermission ?
       await handle.queryPermission(options) :
       handle.writable
@@ -28,7 +28,7 @@ class FileSystemHandle {
 
   async requestPermission (options = {}) {
     if (options.readable) return 'granted'
-    const handle = this.#adapter
+    const handle = this[kAdapter]
     return handle.writable ? 'granted' : 'denied'
   }
 
@@ -39,7 +39,7 @@ class FileSystemHandle {
    * @param {boolean} [options.recursive=false]
    */
   async remove (options = {}) {
-    await this.#adapter.remove(options)
+    await this[kAdapter].remove(options)
   }
 
   /**
@@ -48,7 +48,7 @@ class FileSystemHandle {
   async isSameEntry (other) {
     if (this === other) return true
     if (this.kind !== other.kind) return false
-    return this.#adapter.isSameEntry(other.#adapter)
+    return this[kAdapter].isSameEntry(other[kAdapter])
   }
 }
 
diff --git a/src/getOriginPrivateDirectory.js b/src/getOriginPrivateDirectory.js
index 6096fe1..9c679d4 100644
--- a/src/getOriginPrivateDirectory.js
+++ b/src/getOriginPrivateDirectory.js
@@ -14,7 +14,7 @@ if (globalThis.DataTransferItem && !DataTransferItem.prototype.getAsFileSystemHa
       import('./FileSystemDirectoryHandle.js'),
       import('./FileSystemFileHandle.js')
     ])
-    console.log('jo')
+
     return entry.isFile
       ? new FileSystemFileHandle(new FileHandle(entry, false))
       : new FileSystemDirectoryHandle(new FolderHandle(entry, false))
diff --git a/test/test.js b/test/test.js
index 0f68379..97ad8d5 100644
--- a/test/test.js
+++ b/test/test.js
@@ -14,6 +14,11 @@ import {
   capture
 } from './util.js'
 
+if (!globalThis.WritableStream) {
+  const m = await import('https://cdn.jsdelivr.net/npm/web-streams-polyfill@3/dist/ponyfill.es2018.mjs')
+  globalThis.ReadableStream = m.ReadableStream
+}
+
 /** @type {typeof window.Blob} */
 const Blob = globalThis.Blob || await import('fetch-blob').then(m => m.Blob)