Avoid ES6 syntax in places that are not Babeled. #25415 (#25451)

Author: juj

src/proxyClient.js

@@ -29,7 +29,7 @@ if (ENVIRONMENT_IS_NODE) {
 #else
       // For class modules we decode the data URL and use `eval: true`.
       url = Buffer.from(url.split(",")[1], 'base64').toString();
-      options ||= {}
+      if (!options) options = {};
       options.eval = true;
 #endif
     }
@@ -132,8 +132,7 @@ var frameId = 0;
 
 // Worker
 
-var filename;
-filename ||= '<<< filename >>>';
+var filename = '<<< filename >>>';
 
 var worker = new Worker(filename);
 

src/shell.html

@@ -61,7 +61,7 @@
         },
         canvas: canvasElement,
         setStatus(text) {
-          Module.setStatus.last ??= { time: Date.now(), text: '' };
+          if (!Module.setStatus.last) Module.setStatus.last = { time: Date.now(), text: '' };
           if (text === Module.setStatus.last.text) return;
           var m = text.match(/([^(]+)\((\d+(\.\d+)?)\/(\d+)\)/);
           var now = Date.now();

src/shell_minimal.html

@@ -100,7 +100,7 @@
         },
         canvas: canvasElement,
         setStatus(text) {
-          Module.setStatus.last ??= { time: Date.now(), text: '' };
+          if (!Module.setStatus.last) Module.setStatus.last = { time: Date.now(), text: '' };
           if (text === Module.setStatus.last.text) return;
           var m = text.match(/([^(]+)\((\d+(\.\d+)?)\/(\d+)\)/);
           var now = Date.now();