@uppy/transloadit: remove updateNumberOfFilesInAssembly

[Murderlon]

• If you haven't started the upload yet, this is unneeded.
• If you did start the upload and you try to removeFile(s), Uppy throws an error that individualCancellation is not supported
• If you remove files after the upload is complete, the API returns a 404 for /update_assemblies (which was a bug in itself, trying to call this after the assembly is done).

Internally it was also brought up that /update_assemblies is not something we want to publicly expose.

[github-actions]

Diff output files

diff --git a/packages/@uppy/transloadit/lib/Client.js b/packages/@uppy/transloadit/lib/Client.js
index 798d3da..664510d 100644
--- a/packages/@uppy/transloadit/lib/Client.js
+++ b/packages/@uppy/transloadit/lib/Client.js
@@ -126,26 +126,6 @@ export default class Client {
       })
     );
   }
-  async updateNumberOfFilesInAssembly(assembly, num_expected_upload_files) {
-    const url = new URL(assembly.assembly_ssl_url);
-    url.pathname = "/update_assemblies";
-    const body = JSON.stringify({
-      assembly_updates: [{
-        assembly_id: assembly.assembly_id,
-        num_expected_upload_files,
-      }],
-    });
-    return _classPrivateFieldLooseBase(this, _fetchJSON)[_fetchJSON](url, {
-      method: "POST",
-      headers: _classPrivateFieldLooseBase(this, _headers)[_headers],
-      body,
-    }).catch(err =>
-      _classPrivateFieldLooseBase(this, _reportError)[_reportError](err, {
-        url,
-        type: "API_ERROR",
-      })
-    );
-  }
   async cancelAssembly(assembly) {
     const url = assembly.assembly_ssl_url;
     return _classPrivateFieldLooseBase(this, _fetchJSON)[_fetchJSON](url, {
diff --git a/packages/@uppy/transloadit/lib/index.js b/packages/@uppy/transloadit/lib/index.js
index e9f566d..fdc7ed7 100644
--- a/packages/@uppy/transloadit/lib/index.js
+++ b/packages/@uppy/transloadit/lib/index.js
@@ -593,12 +593,9 @@ function _createAssembly2(fileIDs, uploadID, assemblyOptions) {
       } = _ref2;
       return fileIDs.includes(id);
     });
-    if (files.length !== fileIDs.length) {
-      if (files.length === 0) {
-        await this.client.cancelAssembly(newAssembly);
-        return null;
-      }
-      await this.client.updateNumberOfFilesInAssembly(newAssembly, files.length);
+    if (files.length === 0) {
+      await this.client.cancelAssembly(newAssembly);
+      return null;
     }
     const assembly = new Assembly(newAssembly, _classPrivateFieldLooseBase(this, _rateLimitedQueue)[_rateLimitedQueue]);
     const {
@@ -641,10 +638,6 @@ function _createAssembly2(fileIDs, uploadID, assemblyOptions) {
       if (reason === "cancel-all") {
         assembly.close();
         this.uppy.off("file-removed", fileRemovedHandler);
-      } else if (fileRemoved.id in updatedFiles) {
-        delete updatedFiles[fileRemoved.id];
-        const nbOfRemainingFiles = Object.keys(updatedFiles).length;
-        this.client.updateNumberOfFilesInAssembly(newAssembly, nbOfRemainingFiles).catch(() => {});
       }
     };
     this.uppy.on("file-removed", fileRemovedHandler);