Configure zip.js with pako workers

.gitignore

@@ -46,6 +46,9 @@ Source/ThirdParty/Tween.js
 Source/ThirdParty/Uri.js
 Source/ThirdParty/when.js
 Source/ThirdParty/zip.js
+Source/ThirdParty/Workers/pako_inflate.min.js
+Source/ThirdParty/Workers/pako_deflate.min.js
+Source/ThirdParty/Workers/z-worker-pako.js
 
 /node_modules
 npm-debug.log

CHANGES.md

@@ -1,5 +1,11 @@
 # Change Log
 
+### 1.86.1 - 2021-10-15
+
+##### Fixes :wrench:
+
+- Fixed zip.js configurations causing CesiumJS to not work with Node 16. [#9861](https://github.com/CesiumGS/cesium/pull/9861)
+
 ### 1.86 - 2021-10-01
 
 ##### Breaking Changes :mega:

Source/DataSources/KmlDataSource.js

@@ -1,6 +1,7 @@
 import ArcType from "../Core/ArcType.js";
 import AssociativeArray from "../Core/AssociativeArray.js";
 import BoundingRectangle from "../Core/BoundingRectangle.js";
+import buildModuleUrl from "../Core/buildModuleUrl.js";
 import Cartesian2 from "../Core/Cartesian2.js";
 import Cartesian3 from "../Core/Cartesian3.js";
 import Cartographic from "../Core/Cartographic.js";
@@ -3165,6 +3166,13 @@ function loadKml(
 }
 
 function loadKmz(dataSource, entityCollection, blob, sourceResource) {
+  var zWorkerUrl = buildModuleUrl("ThirdParty/Workers/z-worker-pako.js");
+  zip.configure({
+    workerScripts: {
+      deflate: [zWorkerUrl, "./pako_deflate.min.js"],
+      inflate: [zWorkerUrl, "./pako_inflate.min.js"],
+    },
+  });
   var reader = new zip.ZipReader(new zip.BlobReader(blob));
   return when(reader.getEntries()).then(function (entries) {
     var promises = [];

Source/DataSources/exportKml.js

@@ -1,3 +1,4 @@
+import buildModuleUrl from "../Core/buildModuleUrl.js";
 import Cartesian2 from "../Core/Cartesian2.js";
 import Cartesian3 from "../Core/Cartesian3.js";
 import Cartographic from "../Core/Cartographic.js";
@@ -323,6 +324,13 @@ function exportKml(options) {
 }
 
 function createKmz(kmlString, externalFiles) {
+  var zWorkerUrl = buildModuleUrl("ThirdParty/Workers/z-worker-pako.js");
+  zip.configure({
+    workerScripts: {
+      deflate: [zWorkerUrl, "./pako_deflate.min.js"],
+      inflate: [zWorkerUrl, "./pako_inflate.min.js"],
+    },
+  });
   var blobWriter = new zip.BlobWriter();
   var writer = new zip.ZipWriter(blobWriter);
   // We need to only write one file at a time so the zip doesn't get corrupted

ThirdParty/npm/zip.js

@@ -1,2 +1,2 @@
-import * as zip from "@zip.js/zip.js/lib/zip.js";
+import * as zip from "@zip.js/zip.js/lib/zip-no-worker.js";
 export { zip as default };

gulpfile.cjs

@@ -381,8 +381,8 @@ function combineRelease() {
 
 gulp.task("combineRelease", gulp.series("build", combineRelease));
 
-// Copy Draco3D files from node_modules into Source
 gulp.task("prepare", function (done) {
+  // Copy Draco3D files from node_modules into Source
   fs.copyFileSync(
     "node_modules/draco3d/draco_decoder_nodejs.js",
     "Source/ThirdParty/Workers/draco_decoder_nodejs.js"
@@ -391,6 +391,19 @@ gulp.task("prepare", function (done) {
     "node_modules/draco3d/draco_decoder.wasm",
     "Source/ThirdParty/draco_decoder.wasm"
   );
+  // Copy pako and zip.js worker files to Source/ThirdParty
+  fs.copyFileSync(
+    "node_modules/pako/dist/pako_inflate.min.js",
+    "Source/ThirdParty/Workers/pako_inflate.min.js"
+  );
+  fs.copyFileSync(
+    "node_modules/pako/dist/pako_deflate.min.js",
+    "Source/ThirdParty/Workers/pako_deflate.min.js"
+  );
+  fs.copyFileSync(
+    "node_modules/@zip.js/zip.js/dist/z-worker-pako.js",
+    "Source/ThirdParty/Workers/z-worker-pako.js"
+  );
   done();
 });
 
@@ -434,7 +447,7 @@ gulp.task(
     //See https://github.com/CesiumGS/cesium/pull/3106#discussion_r42793558 for discussion.
     glslToJavaScript(false, "Build/minifyShaders.state");
 
-    // Remove prepare step from package.json to avoid redownloading Draco3d files
+    // Remove prepare step from package.json to avoid running "prepare" an extra time.
     delete packageJson.scripts.prepare;
     fs.writeFileSync(
       "./Build/package.noprepare.json",