commit fb4b3c3a955e73fe20f930fb73588c0ad7a446e5
Author: Sam Clegg <sbc@chromium.org>
Date:   Thu Jun 3 09:42:51 2021 -0700

    Add support for `--preload-file` in Node.js (#11785)

    Note: this is included in emscripten 2.O.24

diff --git a/emsdk/upstream/emscripten/tools/file_packager.py b/emsdk/upstream/emscripten/tools/file_packager.py
index cd70b4b7d..ace6d6b2c 100755
--- a/emsdk/upstream/emscripten/tools/file_packager.py
+++ b/emsdk/upstream/emscripten/tools/file_packager.py
@@ -525,14 +525,12 @@ def main():
     remote_package_size = os.path.getsize(package_name)
     remote_package_name = os.path.basename(package_name)
     ret += r'''
-      var PACKAGE_PATH;
+      var PACKAGE_PATH = '';
       if (typeof window === 'object') {
         PACKAGE_PATH = window['encodeURIComponent'](window.location.pathname.toString().substring(0, window.location.pathname.toString().lastIndexOf('/')) + '/');
-      } else if (typeof location !== 'undefined') {
-        // worker
+      } else if (typeof process === 'undefined' && typeof location !== 'undefined') {
+        // web worker
         PACKAGE_PATH = encodeURIComponent(location.pathname.toString().substring(0, location.pathname.toString().lastIndexOf('/')) + '/');
-      } else {
-        throw 'using preloaded data can only be done on a web page or in a web worker';
       }
       var PACKAGE_NAME = '%s';
       var REMOTE_PACKAGE_BASE = '%s';
@@ -716,6 +714,16 @@ def main():
 
     ret += r'''
       function fetchRemotePackage(packageName, packageSize, callback, errback) {
+        if (typeof process === 'object') {
+          require('fs').readFile(packageName, function(err, contents) {
+            if (err) {
+              errback(err);
+            } else {
+              callback(contents.buffer);
+            }
+          });
+          return;
+        }
         var xhr = new XMLHttpRequest();
         xhr.open('GET', packageName, true);
         xhr.responseType = 'arraybuffer';