Use JS spread operator over Object.assign. NFC (#23759)

This saves a little bit of code size.

Author: sbc100

src/lib/libglfw.js

@@ -53,7 +53,7 @@ var LibraryGLFW = {
       this.title = title;
       this.monitor = monitor;
       this.share = share;
-      this.attributes = Object.assign({}, GLFW.hints);
+      this.attributes = {...GLFW.hints};
       this.inputModes = {
         0x00033001:0x00034001, // GLFW_CURSOR (GLFW_CURSOR_NORMAL)
         0x00033002:0, // GLFW_STICKY_KEYS
@@ -1064,7 +1064,7 @@ var LibraryGLFW = {
     },
 
     defaultWindowHints: () => {
-      GLFW.hints = Object.assign({}, GLFW.defaultHints);
+      GLFW.hints = {...GLFW.defaultHints};
     },
 
     createWindow: (width, height, title, monitor, share) => {

src/lib/libidbfs.js

@@ -59,7 +59,7 @@ addToLibrary({
       if (mount?.opts?.autoPersist) {
         mnt.idbPersistState = 0; // IndexedDB sync starts in idle state
         var memfs_node_ops = mnt.node_ops;
-        mnt.node_ops = Object.assign({}, mnt.node_ops); // Clone node_ops to inject write tracking
+        mnt.node_ops = {...mnt.node_ops}; // Clone node_ops to inject write tracking
         mnt.node_ops.mknod = (parent, name, mode, dev) => {
           var node = memfs_node_ops.mknod(parent, name, mode, dev);
           // Propagate injected node_ops to the newly created child node
@@ -69,7 +69,7 @@ addToLibrary({
           // Remember original MEMFS stream_ops for this node
           node.memfs_stream_ops = node.stream_ops;
           // Clone stream_ops to inject write tracking
-          node.stream_ops = Object.assign({}, node.stream_ops);
+          node.stream_ops = {...node.stream_ops};
 
           // Track all file writes
           node.stream_ops.write = (stream, buffer, offset, length, position, canOwn) => {

src/lib/libnoderawfs.js

@@ -24,7 +24,7 @@ addToLibrary({
     };
     // Use this to reference our in-memory filesystem
     /** @suppress {partialAlias} */
-    var VFS = Object.assign({}, FS);
+    var VFS = {...FS};
     // Wrap the whole in-memory filesystem API with
     // our Node.js based functions
     for (var _key in NODERAWFS) {

src/shell.js

@@ -134,7 +134,7 @@ var ENVIRONMENT_IS_WASM_WORKER = !!Module['$ww'];
 // we collect those properties and reapply _after_ we configure
 // the current environment's defaults to avoid having to be so
 // defensive during initialization.
-var moduleOverrides = Object.assign({}, Module);
+var moduleOverrides = {...Module};
 
 var arguments_ = [];
 var thisProgram = './this.program';

test/browser/test_small_js_flags.js.size

@@ -1 +1 @@
-4150
+4137

test/other/codesize/test_codesize_cxx_ctors1.gzsize

@@ -1 +1 @@
-8263
+8262

test/other/codesize/test_codesize_cxx_ctors1.jssize

@@ -1 +1 @@
-20087
+20074

test/other/codesize/test_codesize_cxx_ctors2.jssize

@@ -1 +1 @@
-20065
+20052

test/other/codesize/test_codesize_cxx_except.jssize

@@ -1 +1 @@
-23854
+23841

test/other/codesize/test_codesize_cxx_except_wasm.gzsize

@@ -1 +1 @@
-8207
+8206