Use nullish operators where is makes sense. NFC (#26864)

sbc100 · web-flow · commit bd05b484e8c4 · 2026-05-05T15:30:57.000-07:00
diff --git a/src/Fetch.js b/src/Fetch.js
@@ -81,7 +81,7 @@ class FetchXHR {
     // Handle Basic Authentication if user/password are provided.
     // This creates a base64-encoded string and sets the Authorization header.
     if (user) {
-      const credentials = btoa(`${user}:${password || ''}`);
+      const credentials = btoa(`${user}:${password ?? ''}`);
       this._headers['Authorization'] = `Basic ${credentials}`;
     }
 
@@ -593,7 +593,7 @@ function fetchXHR(fetch, onsuccess, onerror, onprogress, onreadystatechange) {
     {{{ makeSetValue('fetch', C_STRUCTS.emscripten_fetch_t.data, 'ptr', '*') }}}
     writeI53ToI64(fetch + {{{ C_STRUCTS.emscripten_fetch_t.numBytes }}}, ptrLen);
     writeI53ToI64(fetch + {{{ C_STRUCTS.emscripten_fetch_t.dataOffset }}}, 0);
-    var len = xhr.response ? xhr.response.byteLength : 0;
+    var len = xhr.response?.byteLength ?? 0;
     if (len) {
       // If the final XHR.onload handler receives the bytedata to compute total length, report that,
       // otherwise don't write anything out here, which will retain the latest byte size reported in
@@ -660,7 +660,7 @@ function fetchXHR(fetch, onsuccess, onerror, onprogress, onreadystatechange) {
     if (!Fetch.xhrs.has(id)) {
       return;
     }
-    var ptrLen = (fetchAttrLoadToMemory && fetchAttrStreamData && xhr.response) ? xhr.response.byteLength : 0;
+    var ptrLen = (fetchAttrLoadToMemory && fetchAttrStreamData) ? xhr.response?.byteLength ?? 0 : 0;
     var ptr = 0;
     if (ptrLen > 0 && fetchAttrLoadToMemory && fetchAttrStreamData) {
 #if FETCH_DEBUG
diff --git a/src/jsifier.mjs b/src/jsifier.mjs
@@ -136,7 +136,7 @@ function getTransitiveDeps(symbol) {
   while (toVisit.length) {
     const sym = toVisit.pop();
     if (!seen.has(sym)) {
-      let directDeps = LibraryManager.library[sym + '__deps'] || [];
+      let directDeps = LibraryManager.library[sym + '__deps'] ?? [];
       directDeps = directDeps.filter((d) => typeof d === 'string');
       for (const dep of directDeps) {
         if (!transitiveDeps.has(dep)) {
@@ -228,7 +228,7 @@ function checkDependencies(symbol, snippet, deps, postset) {
       continue;
     }
     const mangled = mangleCSymbolName(dep);
-    if (!snippet.includes(mangled) && (!postset || !postset.includes(mangled))) {
+    if (!snippet.includes(mangled) && !postset?.includes(mangled)) {
       error(`${symbol}: unused dependency: ${dep}`);
     }
   }
@@ -883,7 +883,7 @@ function(${args}) {
 
     writeOutput('// Begin JS library code\n');
     for (const item of libraryItems.concat(postSets)) {
-      writeOutput(indentify(item || '', 2));
+      writeOutput(indentify(item ?? '', 2));
     }
     writeOutput('// End JS library code\n');
 
diff --git a/src/lib/libcore.js b/src/lib/libcore.js
@@ -1522,7 +1522,7 @@ addToLibrary({
 
   _emscripten_sanitizer_get_option__deps: ['$stringToNewUTF8', '$UTF8ToString'],
   _emscripten_sanitizer_get_option__sig: 'pp',
-  _emscripten_sanitizer_get_option: (name) => stringToNewUTF8(Module[UTF8ToString(name)] || ''),
+  _emscripten_sanitizer_get_option: (name) => stringToNewUTF8(Module[UTF8ToString(name)] ?? ''),
 #endif
 
   $readEmAsmArgsArray: [],
@@ -1725,7 +1725,7 @@ addToLibrary({
     return "./this.program";
   },
 #else
-  $getExecutableName: () => thisProgram || './this.program',
+  $getExecutableName: () => thisProgram ?? './this.program',
 #endif
 
   // Receives a Web Audio context plus a set of elements to listen for user
@@ -2246,7 +2246,7 @@ addToLibrary({
       return this.allocated[id] !== undefined;
     }
     allocate(handle) {
-      var id = this.freelist.pop() || this.allocated.length;
+      var id = this.freelist.pop() ?? this.allocated.length;
       this.allocated[id] = handle;
       return id;
     }
diff --git a/src/lib/libfs.js b/src/lib/libfs.js
@@ -1342,8 +1342,8 @@ FS.staticInit();`;
       return stream.stream_ops.ioctl(stream, cmd, arg);
     },
     readFile(path, opts = {}) {
-      opts.flags = opts.flags || {{{ cDefs.O_RDONLY }}};
-      opts.encoding = opts.encoding || 'binary';
+      opts.flags = opts.flags ?? {{{ cDefs.O_RDONLY }}};
+      opts.encoding = opts.encoding ?? 'binary';
       if (opts.encoding !== 'utf8' && opts.encoding !== 'binary') {
         abort(`Invalid encoding type "${opts.encoding}"`);
       }
@@ -1362,7 +1362,7 @@ FS.staticInit();`;
      * @param {TypedArray|Array|string} data
      */
     writeFile(path, data, opts = {}) {
-      opts.flags = opts.flags || {{{ cDefs.O_TRUNC | cDefs.O_CREAT | cDefs.O_WRONLY }}};
+      opts.flags = opts.flags ?? {{{ cDefs.O_TRUNC | cDefs.O_CREAT | cDefs.O_WRONLY }}};
       var stream = FS.open(path, opts.flags, opts.mode);
       data = FS_fileDataToTypedArray(data);
       FS.write(stream, data, 0, data.byteLength, undefined, opts.canOwn);
@@ -1755,8 +1755,8 @@ FS.staticInit();`;
 
           // Function to get a range from the remote URL.
           var doXHR = (from, to) => {
-            if (from > to) abort("invalid range (" + from + ", " + to + ") or no bytes requested!");
-            if (to > datalength-1) abort("only " + datalength + " bytes available! programmer error!");
+            if (from > to) abort(`invalid range (${from}, ${to}) or no bytes requested!`);
+            if (to > datalength-1) abort(`only ${datalength} bytes available! programmer error!`);
 
             // TODO: Use mozResponseArrayBuffer, responseStream, etc. if available.
             var xhr = new XMLHttpRequest();
@@ -1774,7 +1774,7 @@ FS.staticInit();`;
             if (xhr.response !== undefined) {
               return new Uint8Array(/** @type{Array<number>} */(xhr.response || []));
             }
-            return intArrayFromString(xhr.responseText || '', true);
+            return intArrayFromString(xhr.responseText ?? '', true);
           };
           var lazyArray = this;
           lazyArray.setDataGetter((chunkNum) => {
diff --git a/src/lib/libhtml5.js b/src/lib/libhtml5.js
@@ -245,10 +245,9 @@ var LibraryHTML5 = {
 #endif
 
     getNodeNameForTarget(target) {
-      if (!target) return '';
       if (target == window) return '#window';
       if (target == screen) return '#screen';
-      return target?.nodeName || '';
+      return target?.nodeName ?? '';
     },
 
     fullscreenEnabled() {
@@ -297,10 +296,10 @@ var LibraryHTML5 = {
       HEAP32[idx + {{{ C_STRUCTS.EmscriptenKeyboardEvent.charCode / 4 }}}] = e.charCode;
       HEAP32[idx + {{{ C_STRUCTS.EmscriptenKeyboardEvent.keyCode / 4 }}}] = e.keyCode;
       HEAP32[idx + {{{ C_STRUCTS.EmscriptenKeyboardEvent.which / 4 }}}] = e.which;
-      stringToUTF8(e.key || '', keyEventData + {{{ C_STRUCTS.EmscriptenKeyboardEvent.key }}}, {{{ cDefs.EM_HTML5_SHORT_STRING_LEN_BYTES }}});
-      stringToUTF8(e.code || '', keyEventData + {{{ C_STRUCTS.EmscriptenKeyboardEvent.code }}}, {{{ cDefs.EM_HTML5_SHORT_STRING_LEN_BYTES }}});
-      stringToUTF8(e.char || '', keyEventData + {{{ C_STRUCTS.EmscriptenKeyboardEvent.charValue }}}, {{{ cDefs.EM_HTML5_SHORT_STRING_LEN_BYTES }}});
-      stringToUTF8(e.locale || '', keyEventData + {{{ C_STRUCTS.EmscriptenKeyboardEvent.locale }}}, {{{ cDefs.EM_HTML5_SHORT_STRING_LEN_BYTES }}});
+      stringToUTF8(e.key ?? '', keyEventData + {{{ C_STRUCTS.EmscriptenKeyboardEvent.key }}}, {{{ cDefs.EM_HTML5_SHORT_STRING_LEN_BYTES }}});
+      stringToUTF8(e.code ?? '', keyEventData + {{{ C_STRUCTS.EmscriptenKeyboardEvent.code }}}, {{{ cDefs.EM_HTML5_SHORT_STRING_LEN_BYTES }}});
+      stringToUTF8(e.char ?? '', keyEventData + {{{ C_STRUCTS.EmscriptenKeyboardEvent.charValue }}}, {{{ cDefs.EM_HTML5_SHORT_STRING_LEN_BYTES }}});
+      stringToUTF8(e.locale ?? '', keyEventData + {{{ C_STRUCTS.EmscriptenKeyboardEvent.locale }}}, {{{ cDefs.EM_HTML5_SHORT_STRING_LEN_BYTES }}});
 
 #if PTHREADS
       if (targetThread) __emscripten_run_callback_on_thread(targetThread, callbackfunc, eventTypeId, keyEventData, eventSize, userData);
@@ -727,7 +726,7 @@ var LibraryHTML5 = {
 
     var focusEventHandlerFunc = (e) => {
       var nodeName = JSEvents.getNodeNameForTarget(e.target);
-      var id = e.target.id ? e.target.id : '';
+      var id = e.target.id ?? '';
 
       var focusEvent = JSEvents.focusEvent;
       stringToUTF8(nodeName, focusEvent + {{{ C_STRUCTS.EmscriptenFocusEvent.nodeName }}}, {{{ cDefs.EM_HTML5_LONG_STRING_LEN_BYTES }}});
@@ -1025,11 +1024,11 @@ var LibraryHTML5 = {
     // If transitioning to windowed mode, report info about the element that just was fullscreen.
     var reportedElement = isFullscreen ? fullscreenElement : JSEvents.previousFullscreenElement;
     var nodeName = JSEvents.getNodeNameForTarget(reportedElement);
-    var id = reportedElement?.id || '';
+    var id = reportedElement?.id ?? '';
     stringToUTF8(nodeName, eventStruct + {{{ C_STRUCTS.EmscriptenFullscreenChangeEvent.nodeName }}}, {{{ cDefs.EM_HTML5_LONG_STRING_LEN_BYTES }}});
     stringToUTF8(id, eventStruct + {{{ C_STRUCTS.EmscriptenFullscreenChangeEvent.id }}}, {{{ cDefs.EM_HTML5_LONG_STRING_LEN_BYTES }}});
-    {{{ makeSetValue('eventStruct', C_STRUCTS.EmscriptenFullscreenChangeEvent.elementWidth, 'reportedElement ? reportedElement.clientWidth : 0', 'i32') }}};
-    {{{ makeSetValue('eventStruct', C_STRUCTS.EmscriptenFullscreenChangeEvent.elementHeight, 'reportedElement ? reportedElement.clientHeight : 0', 'i32') }}};
+    {{{ makeSetValue('eventStruct', C_STRUCTS.EmscriptenFullscreenChangeEvent.elementWidth, 'reportedElement?.clientWidth ?? 0', 'i32') }}};
+    {{{ makeSetValue('eventStruct', C_STRUCTS.EmscriptenFullscreenChangeEvent.elementHeight, 'reportedElement?.clientHeight ?? 0', 'i32') }}};
     {{{ makeSetValue('eventStruct', C_STRUCTS.EmscriptenFullscreenChangeEvent.screenWidth, 'screen.width', 'i32') }}};
     {{{ makeSetValue('eventStruct', C_STRUCTS.EmscriptenFullscreenChangeEvent.screenHeight, 'screen.height', 'i32') }}};
     if (isFullscreen) {
@@ -1533,7 +1532,7 @@ var LibraryHTML5 = {
     /** @suppress{checkTypes} */
     {{{ makeSetValue('eventStruct', C_STRUCTS.EmscriptenPointerlockChangeEvent.isActive, 'isPointerlocked', 'i8') }}};
     var nodeName = JSEvents.getNodeNameForTarget(pointerLockElement);
-    var id = pointerLockElement?.id || '';
+    var id = pointerLockElement?.id ?? '';
     stringToUTF8(nodeName, eventStruct + {{{ C_STRUCTS.EmscriptenPointerlockChangeEvent.nodeName }}}, {{{ cDefs.EM_HTML5_LONG_STRING_LEN_BYTES }}});
     stringToUTF8(id, eventStruct + {{{ C_STRUCTS.EmscriptenPointerlockChangeEvent.id }}}, {{{ cDefs.EM_HTML5_LONG_STRING_LEN_BYTES }}});
   },
diff --git a/src/lib/libopenal.js b/src/lib/libopenal.js
@@ -253,8 +253,8 @@ var LibraryOpenAL = {
           src.bufOffset = 0.0;
         } else {
           var delta = (currentTime - src.bufStartTime) * src.playbackRate;
-          var loopStart = buf.audioBuf._loopStart || 0.0;
-          var loopEnd = buf.audioBuf._loopEnd || buf.audioBuf.duration;
+          var loopStart = buf.audioBuf._loopStart ?? 0.0;
+          var loopEnd = buf.audioBuf._loopEnd ?? buf.audioBuf.duration;
           if (loopEnd <= loopStart) {
             loopEnd = buf.audioBuf.duration;
           }
@@ -969,8 +969,8 @@ var LibraryOpenAL = {
           return [0, 0];
         }
         return [
-          (buf.audioBuf._loopStart || 0.0) * buf.frequency,
-          (buf.audioBuf._loopEnd || buf.length) * buf.frequency
+          (buf.audioBuf._loopStart ?? 0.0) * buf.frequency,
+          (buf.audioBuf._loopEnd ?? buf.length) * buf.frequency
         ];
       default:
 #if OPENAL_DEBUG
diff --git a/src/lib/libpthread.js b/src/lib/libpthread.js
@@ -802,7 +802,7 @@ var LibraryPThread = {
 #endif
 
     var offscreenCanvases = {}; // Dictionary of OffscreenCanvas objects we'll transfer to the created thread to own
-    var moduleCanvasId = Module['canvas']?.id || '';
+    var moduleCanvasId = Module['canvas']?.id ?? '';
     // Note that transferredCanvasNames might be null (so we cannot do a for-of loop).
     for (var name of transferredCanvasNames) {
       name = name.trim();
diff --git a/src/lib/libwasmfs_js_file.js b/src/lib/libwasmfs_js_file.js
@@ -44,7 +44,7 @@ addToLibrary({
         HEAPU8.set(fileData.subarray(offset, offset + length), buffer);
         return length;
       },
-      getSize: (file) => wasmFS$JSMemoryFiles[file]?.length || 0,
+      getSize: (file) => wasmFS$JSMemoryFiles[file]?.length ?? 0,
       setSize: (file, size) => {
         // Allocate a new array of the proper size, and copy as much data as
         // possible.
diff --git a/src/lib/libwebgl.js b/src/lib/libwebgl.js
@@ -219,7 +219,7 @@ for (/**@suppress{duplicate}*/var i = 0; i <= {{{ GL_POOL_TEMP_BUFFERS_SIZE }}};
       'WEBGL_polygon_mode'
     ];
     // .getSupportedExtensions() can return null if context is lost, so coerce to empty array.
-    return (ctx.getSupportedExtensions() || []).filter(ext => supportedExtensions.includes(ext));
+    return ctx.getSupportedExtensions()?.filter(ext => supportedExtensions.includes(ext)) ?? [];
   },
 
   $GLctx__internal: true,
@@ -3317,7 +3317,7 @@ for (/**@suppress{duplicate}*/var i = 0; i <= {{{ GL_POOL_TEMP_BUFFERS_SIZE }}};
 #endif
     GLctx.compileShader(GL.shaders[shader]);
 #if GL_DEBUG
-    var log = (GLctx.getShaderInfoLog(GL.shaders[shader]) || '').trim();
+    var log = GLctx.getShaderInfoLog(GL.shaders[shader])?.trim();
     if (log) dbg(`glCompileShader: ${log}`);
 #endif
   },
@@ -3501,7 +3501,7 @@ for (/**@suppress{duplicate}*/var i = 0; i <= {{{ GL_POOL_TEMP_BUFFERS_SIZE }}};
     program = GL.programs[program];
     GLctx.linkProgram(program);
 #if GL_DEBUG
-    var log = (GLctx.getProgramInfoLog(program) || '').trim();
+    var log = GLctx.getProgramInfoLog(program)?.trim();
     if (log) dbg(`glLinkProgram: ${log}`);
     if (program.uniformLocsById) dbg(`glLinkProgram invalidated ${Object.keys(program.uniformLocsById).length} uniform location mappings`);
 #endif
diff --git a/src/parseTools.mjs b/src/parseTools.mjs
@@ -847,14 +847,14 @@ export function modifyJSFunction(text, func) {
   let oneliner = false;
   let match = text.match(/^\s*(async\s+)?function\s+([^(]*)?\s*\(([^)]*)\)/);
   if (match) {
-    async_ = match[1] || '';
+    async_ = match[1] ?? '';
     args = match[3];
     rest = text.slice(match[0].length);
   } else {
     // Match an arrow function
     let match = text.match(/^\s*(var (\w+) = )?(async\s+)?\(([^)]*)\)\s+=>\s+/);
     if (match) {
-      async_ = match[3] || '';
+      async_ = match[3] ?? '';
       args = match[4];
       rest = text.slice(match[0].length);
       rest = rest.trim();
@@ -864,7 +864,7 @@ export function modifyJSFunction(text, func) {
       // for both, but it would be more complex).
       match = text.match(/^\s*(async\s+)?function\(([^)]*)\)/);
       assert(match, `could not match function:\n${text}\n`);
-      async_ = match[1] || '';
+      async_ = match[1] ?? '';
       args = match[2];
       rest = text.slice(match[0].length);
     }
diff --git a/test/codesize/test_codesize_cxx_except.json b/test/codesize/test_codesize_cxx_except.json
@@ -1,10 +1,10 @@
 {
   "a.out.js": 23240,
-  "a.out.js.gz": 8977,
+  "a.out.js.gz": 8978,
   "a.out.nodebug.wasm": 172526,
   "a.out.nodebug.wasm.gz": 57447,
   "total": 195766,
-  "total_gz": 66424,
+  "total_gz": 66425,
   "sent": [
     "__cxa_begin_catch",
     "__cxa_end_catch",
diff --git a/test/codesize/test_codesize_cxx_lto.json b/test/codesize/test_codesize_cxx_lto.json
@@ -1,10 +1,10 @@
 {
   "a.out.js": 18629,
-  "a.out.js.gz": 7684,
+  "a.out.js.gz": 7685,
   "a.out.nodebug.wasm": 101958,
   "a.out.nodebug.wasm.gz": 39461,
   "total": 120587,
-  "total_gz": 47145,
+  "total_gz": 47146,
   "sent": [
     "a (emscripten_resize_heap)",
     "b (_setitimer_js)",
diff --git a/test/codesize/test_codesize_cxx_mangle.json b/test/codesize/test_codesize_cxx_mangle.json
@@ -1,10 +1,10 @@
 {
   "a.out.js": 23290,
-  "a.out.js.gz": 8999,
+  "a.out.js.gz": 9000,
   "a.out.nodebug.wasm": 238955,
   "a.out.nodebug.wasm.gz": 79818,
   "total": 262245,
-  "total_gz": 88817,
+  "total_gz": 88818,
   "sent": [
     "__cxa_begin_catch",
     "__cxa_end_catch",
diff --git a/test/codesize/test_codesize_file_preload.expected.js b/test/codesize/test_codesize_file_preload.expected.js
@@ -2491,8 +2491,8 @@ var FS = {
     return stream.stream_ops.ioctl(stream, cmd, arg);
   },
   readFile(path, opts = {}) {
-    opts.flags = opts.flags || 0;
-    opts.encoding = opts.encoding || "binary";
+    opts.flags = opts.flags ?? 0;
+    opts.encoding = opts.encoding ?? "binary";
     if (opts.encoding !== "utf8" && opts.encoding !== "binary") {
       abort(`Invalid encoding type "${opts.encoding}"`);
     }
@@ -2508,7 +2508,7 @@ var FS = {
     return buf;
   },
   writeFile(path, data, opts = {}) {
-    opts.flags = opts.flags || 577;
+    opts.flags = opts.flags ?? 577;
     var stream = FS.open(path, opts.flags, opts.mode);
     data = FS_fileDataToTypedArray(data);
     FS.write(stream, data, 0, data.byteLength, undefined, opts.canOwn);
@@ -2847,8 +2847,8 @@ var FS = {
         if (!hasByteServing) chunkSize = datalength;
         // Function to get a range from the remote URL.
         var doXHR = (from, to) => {
-          if (from > to) abort("invalid range (" + from + ", " + to + ") or no bytes requested!");
-          if (to > datalength - 1) abort("only " + datalength + " bytes available! programmer error!");
+          if (from > to) abort(`invalid range (${from}, ${to}) or no bytes requested!`);
+          if (to > datalength - 1) abort(`only ${datalength} bytes available! programmer error!`);
           // TODO: Use mozResponseArrayBuffer, responseStream, etc. if available.
           var xhr = new XMLHttpRequest;
           xhr.open("GET", url, false);
@@ -2863,7 +2863,7 @@ var FS = {
           if (xhr.response !== undefined) {
             return new Uint8Array(/** @type{Array<number>} */ (xhr.response || []));
           }
-          return intArrayFromString(xhr.responseText || "", true);
+          return intArrayFromString(xhr.responseText ?? "", true);
         };
         var lazyArray = this;
         lazyArray.setDataGetter(chunkNum => {
diff --git a/test/codesize/test_codesize_file_preload.json b/test/codesize/test_codesize_file_preload.json
@@ -1,10 +1,10 @@
 {
-  "a.out.js": 22207,
-  "a.out.js.gz": 9203,
+  "a.out.js": 22204,
+  "a.out.js.gz": 9207,
   "a.out.nodebug.wasm": 1648,
   "a.out.nodebug.wasm.gz": 938,
-  "total": 23855,
-  "total_gz": 10141,
+  "total": 23852,
+  "total_gz": 10145,
   "sent": [
     "a (fd_write)"
   ],
diff --git a/test/codesize/test_codesize_hello_dylink.json b/test/codesize/test_codesize_hello_dylink.json
@@ -1,10 +1,10 @@
 {
   "a.out.js": 26251,
-  "a.out.js.gz": 11194,
+  "a.out.js.gz": 11195,
   "a.out.nodebug.wasm": 17671,
   "a.out.nodebug.wasm.gz": 8925,
   "total": 43922,
-  "total_gz": 20119,
+  "total_gz": 20120,
   "sent": [
     "__syscall_stat64",
     "emscripten_resize_heap",
diff --git a/test/codesize/test_codesize_hello_dylink_all.json b/test/codesize/test_codesize_hello_dylink_all.json
@@ -1,7 +1,7 @@
 {
-  "a.out.js": 244573,
+  "a.out.js": 244557,
   "a.out.nodebug.wasm": 578037,
-  "total": 822610,
+  "total": 822594,
   "sent": [
     "IMG_Init",
     "IMG_Load",

Original file line number	Diff line number	Diff line change
`@@ -136,7 +136,7 @@ function getTransitiveDeps(symbol) {`
`136`	`136`	`while (toVisit.length) {`
`137`	`137`	`const sym = toVisit.pop();`
`138`	`138`	`if (!seen.has(sym)) {`
`139`		`- let directDeps = LibraryManager.library[sym + '__deps'] \|\| [];`
	`139`	`+ let directDeps = LibraryManager.library[sym + '__deps'] ?? [];`
`140`	`140`	`directDeps = directDeps.filter((d) => typeof d === 'string');`
`141`	`141`	`for (const dep of directDeps) {`
`142`	`142`	`if (!transitiveDeps.has(dep)) {`
`@@ -228,7 +228,7 @@ function checkDependencies(symbol, snippet, deps, postset) {`
`228`	`228`	`continue;`
`229`	`229`	`}`
`230`	`230`	`const mangled = mangleCSymbolName(dep);`
`231`		`- if (!snippet.includes(mangled) && (!postset \|\| !postset.includes(mangled))) {`
	`231`	`+ if (!snippet.includes(mangled) && !postset?.includes(mangled)) {`
`232`	`232`	error(`${symbol}: unused dependency: ${dep}`);
`233`	`233`	`}`
`234`	`234`	`}`
`@@ -883,7 +883,7 @@ function(${args}) {`
`883`	`883`
`884`	`884`	`writeOutput('// Begin JS library code\n');`
`885`	`885`	`for (const item of libraryItems.concat(postSets)) {`
`886`		`- writeOutput(indentify(item \|\| '', 2));`
	`886`	`+ writeOutput(indentify(item ?? '', 2));`
`887`	`887`	`}`
`888`	`888`	`writeOutput('// End JS library code\n');`
`889`	`889`