3 files changed, 11 insertions, 7 deletions
diff --git a/app/javascript/activestorage/direct_upload.js b/app/javascript/activestorage/direct_upload.js
index 7bbe4e0fdd..7085e0a4ab 100644
--- a/app/javascript/activestorage/direct_upload.js
+++ b/app/javascript/activestorage/direct_upload.js
@@ -5,16 +5,15 @@ import { BlobUpload } from "./blob_upload"
 let id = 0
 
 export class DirectUpload {
-  constructor(file, options = {}) {
-    this.id = id++
+  constructor(file, url, delegate) {
+    this.id = ++id
     this.file = file
-    this.url = options.url
-    this.delegate = options.delegate
+    this.url = url
+    this.delegate = delegate
   }
 
   create(callback) {
-    const fileChecksum = new FileChecksum(this.file)
-    fileChecksum.create((error, checksum) => {
+    FileChecksum.create(this.file, (error, checksum) => {
       const blob = new BlobRecord(this.file, checksum, this.url)
       notify(this.delegate, "directUploadWillCreateBlobWithXHR", blob.xhr)
       blob.create(error => {
diff --git a/app/javascript/activestorage/direct_upload_controller.js b/app/javascript/activestorage/direct_upload_controller.js
index a5541c81be..987050889a 100644
--- a/app/javascript/activestorage/direct_upload_controller.js
+++ b/app/javascript/activestorage/direct_upload_controller.js
@@ -5,7 +5,7 @@ export class DirectUploadController {
   constructor(input, file) {
     this.input = input
     this.file = file
-    this.directUpload = new DirectUpload(this.file, { url: this.url, delegate: this })
+    this.directUpload = new DirectUpload(this.file, this.url, this)
     this.dispatch("initialize")
   }
 
diff --git a/app/javascript/activestorage/file_checksum.js b/app/javascript/activestorage/file_checksum.js
index d7a10b3e55..ffaec1a128 100644
--- a/app/javascript/activestorage/file_checksum.js
+++ b/app/javascript/activestorage/file_checksum.js
@@ -3,6 +3,11 @@ import SparkMD5 from "spark-md5"
 const fileSlice = File.prototype.slice || File.prototype.mozSlice || File.prototype.webkitSlice
 
 export class FileChecksum {
+  static create(file, callback) {
+    const instance = new FileChecksum(file)
+    instance.create(callback)
+  }
+
   constructor(file) {
     this.file = file
     this.chunkSize = 2097152 // 2MB