@uppy/remote-sources: migrate to TS

[Murderlon]

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[github-actions]

Diff output files

diff --git a/packages/@uppy/remote-sources/lib/index.js b/packages/@uppy/remote-sources/lib/index.js
index 394421d..7d01f49 100644
--- a/packages/@uppy/remote-sources/lib/index.js
+++ b/packages/@uppy/remote-sources/lib/index.js
@@ -33,23 +33,22 @@ const availablePlugins = {
   Url,
   Zoom,
 };
+const defaultOptions = {
+  sources: Object.keys(availablePlugins),
+};
 var _installedPlugins = _classPrivateFieldLooseKey("installedPlugins");
 export default class RemoteSources extends BasePlugin {
   constructor(uppy, opts) {
-    super(uppy, opts);
+    super(uppy, {
+      ...defaultOptions,
+      ...opts,
+    });
     Object.defineProperty(this, _installedPlugins, {
       writable: true,
       value: new Set(),
     });
     this.id = this.opts.id || "RemoteSources";
     this.type = "preset";
-    const defaultOptions = {
-      sources: Object.keys(availablePlugins),
-    };
-    this.opts = {
-      ...defaultOptions,
-      ...opts,
-    };
     if (this.opts.companionUrl == null) {
       throw new Error(
         "Please specify companionUrl for RemoteSources to work, see https://uppy.io/docs/remote-sources#companionUrl",