Update src/components/loader/tw-progress-monitor.js

src/components/loader/tw-progress-monitor.js

@@ -1,6 +1,3 @@
-// This file implements some extremely terrible tricks to monitor project loading progress.
-// Please don't use this as a reference for "good JS code"
-
 let total = 0;
 let complete = 0;
 
@@ -54,7 +51,7 @@ const setState = newState => {
 export const fetchWithProgress = url => {
     setState(1);
     return new Promise((resolve, reject) => {
-        // fetch() does not support progress, so we use XMLHttpRequest
+        // XMLHttpRequestの進行状況処理
         const xhr = new XMLHttpRequest();
         xhr.responseType = 'blob';
         xhr.onload = () => {
@@ -75,7 +72,7 @@ export const fetchWithProgress = url => {
     });
 };
 
-// Scratch uses fetch() to download the project JSON, so we override it to monitor when the project is being downloaded.
+// fetchのオーバーライド
 const originalFetch = window.fetch;
 window.fetch = (url, opts) => {
     const isGET = typeof opts === 'object' && opts && opts.method === 'GET';
@@ -86,6 +83,7 @@ window.fetch = (url, opts) => {
     return originalFetch(url, opts);
 };
 
+// Web Workerのメッセージ処理
 const handleWorkerMessage = e => {
     const data = e.data;
     if (Array.isArray(data)) {