Typescript migration part 2 (#261)

Converts everything to typescript, adding `@ts-expect-error`s where
necessary. Also makes some progress converting elements to use
decorators, but we're not fully there yet — I think it'll make sense to
continue to do that in future PRs, rather than doing it all in one go,
just so that we can keep up with the dev branch.

src/replay.ts

@@ -10,6 +10,7 @@ class Replay extends LitElement {
   collInfo: Item | Record<string, never> | null = null;
 
   @property({ type: String })
+  // eslint-disable-next-line @typescript-eslint/no-explicit-any -- TODO fixme
   sourceUrl: any = null;
 
   // external url set from parent
@@ -33,12 +34,14 @@ class Replay extends LitElement {
   title = "";
 
   @property({ type: String })
+  // eslint-disable-next-line @typescript-eslint/no-explicit-any -- TODO fixme
   iframeUrl: any = null;
 
   @property({ type: Boolean })
   showAuth = false;
 
   @property({ type: Object })
+  // eslint-disable-next-line @typescript-eslint/no-explicit-any -- TODO fixme
   authFileHandle: any = null;
 
   private reauthWait: null | Promise<void> = null;
@@ -161,7 +164,8 @@ class Replay extends LitElement {
     }
   }
 
-  setDisablePointer(disable) {
+  // eslint-disable-next-line @typescript-eslint/no-explicit-any -- TODO fixme
+  setDisablePointer(disable: any) {
     const iframe = this.renderRoot.querySelector("iframe");
 
     if (iframe) {
@@ -169,7 +173,8 @@ class Replay extends LitElement {
     }
   }
 
-  onReplayMessage(event) {
+  // eslint-disable-next-line @typescript-eslint/no-explicit-any -- TODO fixme
+  onReplayMessage(event: any) {
     const iframe = this.renderRoot.querySelector("iframe");
 
     if (iframe && event.source === iframe.contentWindow) {
@@ -237,6 +242,7 @@ class Replay extends LitElement {
         !iframe.contentDocument ||
         !iframe.contentWindow ||
         (iframe.contentDocument.readyState === "complete" &&
+          // eslint-disable-next-line @typescript-eslint/no-explicit-any -- TODO fixme
           !(iframe.contentWindow as Window & { _WBWombat: any })._WBWombat)
       ) {
         this.clearLoading(iframe && iframe.contentWindow);