diff --git a/src/appmain.js b/src/appmain.ts
similarity index 90%
rename from src/appmain.js
rename to src/appmain.ts
index b978e43..368934b 100644
--- a/src/appmain.js
+++ b/src/appmain.ts
@@ -1,4 +1,6 @@
 import { LitElement, html, css } from "lit";
+import { property, state } from "lit/decorators.js";
+import { ifDefined } from "lit/directives/if-defined.js";
 import {
   wrapCss,
   rwpLogo,
@@ -14,24 +16,60 @@ import { SWManager } from "./swmanager";
 
 // ===========================================================================
 class ReplayWebApp extends LitElement {
+  @property({ type: Boolean })
+  inited = false;
+
+  @property({ type: Object })
+  pageParams: URLSearchParams = new URLSearchParams();
+
+  @property({ type: String })
+  sourceUrl: string | null = null;
+
+  @property({ type: Boolean })
+  navMenuShown = false;
+
+  @property({ type: Boolean })
+  showAbout = false;
+
+  @property({ type: Boolean })
+  showFileDropOverlay = false;
+
+  @property({ type: String })
+  collTitle: string | null = null;
+
+  @property({ type: Object })
+  loadInfo: any = null;
+
+  @property({ type: String })
+  embed: any = null;
+
+  @property({ type: String })
+  collPageUrl = "";
+
+  @property({ type: String })
+  pageTitle = "";
+
+  @property({ type: Boolean })
+  pageReplay = false;
+
+  @property({ type: String })
+  source: any = null;
+
+  @property({ type: Boolean })
+  skipRuffle = false;
+
+  @property({ type: Object })
+  swErrorMsg: any = null;
+
+  private swName?: string;
+  private swmanager: SWManager | null;
+  private useRuffle = false;
+
+  private droppedFile: File | null = null;
+
   // eslint-disable-next-line no-undef
   constructor(swName = __SW_NAME__) {
     super();
-    this.sourceUrl = null;
-    this.collTitle = null;
-    this.showAbout = false;
-    this.showFileDropOverlay = false;
-
-    this.pageParams = new URLSearchParams();
-
-    this.inited = false;
-    this.navMenuShown = false;
-
-    this.collPageUrl = "";
-    this.pageTitle = "";
-    this.pageReplay = false;
-
-    this.loadInfo = null;
 
     this.swName = swName;
     this.swmanager = null;
@@ -58,21 +96,21 @@ class ReplayWebApp extends LitElement {
     });
 
     this.addEventListener("drop", (dragEvent) => {
-      this.droppedFile = dragEvent.dataTransfer.files[0];
+      this.droppedFile = dragEvent.dataTransfer?.files[0] || null;
       this.showFileDropOverlay = false;
       dragEvent.preventDefault();
     });
-
-    this.maybeStartFileDrop = (dragEvent) => {
-      if (this.sourceUrl) {
-        // A source is already loaded. Don't allow dropping a file.
-        return;
-      }
-      this.showFileDropOverlay = true;
-      dragEvent.preventDefault();
-    };
   }
 
+  private maybeStartFileDrop = (dragEvent) => {
+    if (this.sourceUrl) {
+      // A source is already loaded. Don't allow dropping a file.
+      return;
+    }
+    this.showFileDropOverlay = true;
+    dragEvent.preventDefault();
+  };
+
   get appName() {
     return "ReplayWeb.page";
   }
@@ -81,27 +119,6 @@ class ReplayWebApp extends LitElement {
     return window.location.pathname;
   }
 
-  static get properties() {
-    return {
-      inited: { type: Boolean },
-      pageParams: { type: Object },
-      sourceUrl: { type: String },
-      navMenuShown: { type: Boolean },
-      showAbout: { type: Boolean },
-      showFileDropOverlay: { type: Boolean },
-      collTitle: { type: String },
-      loadInfo: { type: Object },
-      embed: { type: String },
-      collPageUrl: { type: String },
-      pageTitle: { type: String },
-      pageReplay: { type: Boolean },
-      source: { type: String },
-      skipRuffle: { type: Boolean },
-
-      swErrorMsg: { type: Object },
-    };
-  }
-
   static get styles() {
     return wrapCss(ReplayWebApp.appStyles);
   }
@@ -364,10 +381,10 @@ class ReplayWebApp extends LitElement {
   renderColl() {
     return html` <wr-coll
       .loadInfo="${this.loadInfo}"
-      sourceUrl="${this.sourceUrl}"
+      sourceUrl="${this.sourceUrl || ""}"
       embed="${this.embed}"
       appName="${this.appName}"
-      swName="${this.swName}"
+      swName="${ifDefined(this.swName)}"
       .appLogo="${this.mainLogo}"
       @replay-favicons=${this.onFavIcons}
       @update-title=${this.onTitle}
@@ -436,7 +453,7 @@ class ReplayWebApp extends LitElement {
       .register()
       .catch(
         () =>
-          (this.swErrorMsg = this.swmanager.renderErrorReport(this.mainLogo)),
+          (this.swErrorMsg = this.swmanager?.renderErrorReport(this.mainLogo)),
       );
 
     window.addEventListener("popstate", () => {
@@ -451,7 +468,7 @@ class ReplayWebApp extends LitElement {
   }
 
   onFavIcons(event) {
-    const head = document.querySelector("head");
+    const head = document.querySelector("head")!;
     const oldLinks = document.querySelectorAll("link[rel*='icon']");
 
     for (const link of oldLinks) {
@@ -470,7 +487,7 @@ class ReplayWebApp extends LitElement {
     // This is a workaround, since this app's routing doesn't permit normal
     // following of in-page anchors.
     event.preventDefault();
-    this.renderRoot.querySelector("#skip-main-target").focus();
+    (this.renderRoot.querySelector("#skip-main-target") as HTMLElement).focus();
   }
 
   onNavMenu(event) {
@@ -487,7 +504,9 @@ class ReplayWebApp extends LitElement {
         (event) => {
           event.preventDefault();
           this.navMenuShown = false;
-          this.renderRoot.querySelector("#menu-button").focus();
+          (
+            this.renderRoot.querySelector("#menu-button") as HTMLElement
+          ).focus();
         },
         { once: true },
       );
@@ -497,7 +516,9 @@ class ReplayWebApp extends LitElement {
           if (event.key == "Escape") {
             event.preventDefault();
             this.navMenuShown = false;
-            this.renderRoot.querySelector("#menu-button").focus();
+            (
+              this.renderRoot.querySelector("#menu-button") as HTMLElement
+            ).focus();
           }
         },
         { once: true },
@@ -510,7 +531,7 @@ class ReplayWebApp extends LitElement {
     this.pageParams = new URLSearchParams(window.location.search);
 
     // Google Drive
-    let state = this.pageParams.get("state");
+    let state: any = this.pageParams.get("state");
     if (state) {
       try {
         state = JSON.parse(state);
@@ -557,7 +578,9 @@ class ReplayWebApp extends LitElement {
 
     if (this.pageParams.get("config")) {
       try {
-        this.loadInfo.extraConfig = JSON.parse(this.pageParams.get("config"));
+        this.loadInfo.extraConfig = JSON.parse(
+          this.pageParams.get("config") || "",
+        );
       } catch (e) {
         console.log("invalid config: " + e);
       }
@@ -596,7 +619,7 @@ class ReplayWebApp extends LitElement {
     }
 
     if (this.pageParams.get("swName")) {
-      this.swName = this.pageParams.get("swName");
+      this.swName = this.pageParams.get("swName") || undefined;
     }
 
     if (IS_APP && this.sourceUrl.startsWith("file://")) {
diff --git a/src/coll-index.js b/src/coll-index.ts
similarity index 94%
rename from src/coll-index.js
rename to src/coll-index.ts
index 30b715b..ee0b665 100644
--- a/src/coll-index.js
+++ b/src/coll-index.ts
@@ -1,4 +1,5 @@
 import { LitElement, html, css } from "lit";
+import { property, state } from "lit/decorators.js";
 import { wrapCss, apiPrefix } from "./misc";
 import { map } from "lit/directives/map.js";
 
@@ -11,26 +12,41 @@ import fasArrowDown from "@fortawesome/fontawesome-free/svgs/solid/angle-double-
 
 import fasSearch from "@fortawesome/fontawesome-free/svgs/solid/search.svg";
 
+import type { Coll } from "./types";
+
 // ===========================================================================
 class CollIndex extends LitElement {
+  @property({ type: Array })
+  colls: Coll[] = [];
+
+  @property({ type: String })
+  query = "";
+
+  @property({ type: Array })
+  filteredColls: any[] = [];
+
+  @property({ type: Array })
+  sortedColls: any[] | null = null;
+
+  @property({ type: Boolean })
+  hideHeader: any = null;
+
+  @property({ type: String })
+  dateName = "Date Loaded";
+
+  @property({ type: String })
+  headerName = "Loaded Archives";
+
+  @state()
+  private _deleting: any = {};
+
+  private typeFilter = "";
+  private indexParams = "";
+
   constructor() {
     super();
 
-    this.colls = [];
-    this.filteredColls = [];
-    this.sortedColls = null;
-
-    this.query = "";
-
     this.hideHeader = localStorage.getItem("index:hideHeader") === "1";
-
-    this._deleting = {};
-
-    this.dateName = "Date Loaded";
-    this.headerName = "Loaded Archives";
-
-    this.typeFilter = "";
-    this.indexParams = "";
   }
 
   get sortKeys() {
@@ -45,25 +61,6 @@ class CollIndex extends LitElement {
     ];
   }
 
-  static get properties() {
-    return {
-      colls: { type: Array },
-
-      query: { type: String },
-
-      filteredColls: { type: Array },
-
-      sortedColls: { type: Array },
-
-      hideHeader: { type: Boolean },
-
-      _deleting: { type: Object },
-
-      dateName: { type: String },
-      headerName: { type: String },
-    };
-  }
-
   firstUpdated() {
     this.loadColls();
   }
@@ -363,19 +360,14 @@ class CollIndex extends LitElement {
 
 // ===========================================================================
 class CollInfo extends LitElement {
-  constructor() {
-    super();
-    this.detailed = false;
-    this.canDelete = false;
-  }
+  @property({ type: Object })
+  coll!: Coll | Record<string, never>;
 
-  static get properties() {
-    return {
-      coll: { type: Object },
-      detailed: { type: Boolean },
-      canDelete: { type: Boolean },
-    };
-  }
+  @property({ type: Boolean })
+  detailed = false;
+
+  @property({ type: Boolean })
+  canDelete = false;
 
   static get styles() {
     return wrapCss(CollInfo.compStyles);
@@ -526,7 +518,7 @@ class CollInfo extends LitElement {
             <ol style="padding: revert">
               ${map(
                 coll.resources,
-                (resource) =>
+                (resource: any) =>
                   html`<li>
                     <a href="${resource.path}">${resource.name + "\n"}</a>
                   </li>`,
diff --git a/src/coll.ts b/src/coll.ts
index c1ccb4e..87d2974 100644
--- a/src/coll.ts
+++ b/src/coll.ts
@@ -1,6 +1,5 @@
 import { LitElement, html, css } from "lit";
 import { property, state } from "lit/decorators.js";
-import { map } from "lit/directives/map.js";
 import type {
   SlDropdown,
   SlMenu,
@@ -47,6 +46,8 @@ import fasCaretDown from "@fortawesome/fontawesome-free/svgs/solid/caret-down.sv
 
 import { RWPEmbedReceipt } from "./embed-receipt.js";
 import Split from "split.js";
+
+import type { Coll as CollInfo } from "./types";
 import type { Replay } from "./replay";
 
 const RWP_SCHEME = "search://";
@@ -66,7 +67,7 @@ class Coll extends LitElement {
   showSidebar: boolean | null = null;
 
   @property({ type: Object, attribute: false })
-  collInfo: any = null;
+  collInfo: CollInfo | Record<string, never> | null = null;
 
   @property({ type: String })
   coll = "";
@@ -96,13 +97,13 @@ class Coll extends LitElement {
   ts = "";
 
   @property({ type: Boolean })
-  isFullscreen: any;
+  isFullscreen: boolean | null = null;
 
   @property({ type: Boolean })
   menuActive = false;
 
   @property({ type: String })
-  embed: any;
+  embed: string | null = null;
 
   @property({ type: Boolean })
   embedDropdownActive = false;
@@ -135,24 +136,30 @@ class Coll extends LitElement {
   autoUpdateInterval = 10;
 
   @property({ type: String })
-  swName: any;
+  swName: any = null;
 
-  private tabNames = ["pages", "story", "resources", "info"];
-  private tabLabels = {
+  private splitter: any = null;
+
+  private _replaceLoc = false;
+  private _locUpdateNeeded = false;
+
+  private _locationHash = "";
+
+  private _autoUpdater: null | Promise<void> = null;
+
+  private observer?: IntersectionObserver;
+
+  private readonly tabNames = ["pages", "story", "resources", "info"];
+  private readonly tabLabels = {
     pages: "Pages",
     story: "Story",
     resources: "URLs",
     info: "Archive Info",
   };
-  private splitter: any = null;
-  private _replaceLoc = false;
-  private _locUpdateNeeded = false;
-  private _locationHash = "";
-  private _autoUpdater: Promise<void> | null = null;
-  private observer?: IntersectionObserver;
 
   constructor() {
     super();
+
     this.showSidebar = localStorage.getItem("pages:showSidebar") === "1";
   }
 
@@ -301,7 +308,9 @@ class Coll extends LitElement {
 
   configureSplitter() {
     if (this.tabData.url && this.showSidebar) {
-      const contents = this.renderRoot.querySelector("#contents");
+      const contents = this.renderRoot.querySelector(
+        "#contents",
+      ) as HTMLElement;
       const replay = this.renderRoot.querySelector("wr-coll-replay") as Replay;
 
       if (contents && replay && !this.splitter) {
@@ -379,15 +388,17 @@ class Coll extends LitElement {
       });
     }
 
-    if (!this.collInfo.title) {
-      this.collInfo.title = this.collInfo.filename;
+    if (!this.collInfo!.title) {
+      this.collInfo!.title = this.collInfo!.filename;
     }
 
     if (this.embed === "replayonly" || this.embed === "replay-with-info") {
       this.showSidebar = false;
     }
 
-    this.hasStory = this.collInfo.desc || this.collInfo.lists.length;
+    this.hasStory = Boolean(
+      this.collInfo!.desc || this.collInfo!.lists?.length,
+    );
 
     this.dispatchEvent(
       new CustomEvent("coll-loaded", {
@@ -435,12 +446,12 @@ class Coll extends LitElement {
     }
 
     if (
-      this.collInfo.coll &&
+      this.collInfo?.coll &&
       (!this.tabData.view || !this.tabNames.includes(this.tabData.view))
     ) {
       const view = this.hasStory
         ? "story"
-        : this.editable || this.collInfo.pages.length
+        : this.editable || this.collInfo.pages?.length
         ? "pages"
         : "resources";
 
@@ -452,7 +463,11 @@ class Coll extends LitElement {
 
     if (this.tabData.url && this.tabData.url.startsWith("page:")) {
       const pageIndex = Number(this.tabData.url.slice("page:".length));
-      if (!isNaN(pageIndex) && pageIndex < this.collInfo.pages.length) {
+      if (
+        this.collInfo?.pages &&
+        !isNaN(pageIndex) &&
+        pageIndex < this.collInfo.pages.length
+      ) {
         const page = this.collInfo.pages[pageIndex];
         this.tabData.url = page.url;
         this.tabData.ts = getPageDateTS(page).timestamp;
@@ -852,7 +867,7 @@ class Coll extends LitElement {
     if (this.collInfo && !this.collInfo.coll) {
       return html` <wr-loader
         .loadInfo="${this.loadInfo}"
-        embed="${this.embed}"
+        embed="${this.embed || ""}"
         swName="${this.swName}"
         .coll="${this.coll}"
         sourceUrl="${this.sourceUrl || ""}"
@@ -1442,7 +1457,7 @@ class Coll extends LitElement {
     }
 
     return html`<rwp-embed-receipt
-      .collInfo=${this.collInfo}
+      .collInfo=${this.collInfo || {}}
       url=${this.url}
       ts=${this.ts}
       .appLogo=${this.appLogo}
@@ -1465,6 +1480,7 @@ class Coll extends LitElement {
   }
 
   renderCollInfo() {
+    if (!this.collInfo) return;
     return html` <div class="info-bg">
       <wr-coll-info
         class="is-list"
@@ -1490,7 +1506,7 @@ class Coll extends LitElement {
       ${isInfo ? this.renderCollInfo() : html``}
       ${isStory
         ? html` <wr-coll-story
-            .collInfo="${this.collInfo}"
+            .collInfo="${this.collInfo || {}}"
             .active="${isStory}"
             currList="${this.tabData.currList || 0}"
             @coll-tab-nav="${this.onCollTabNav}"
@@ -1503,7 +1519,7 @@ class Coll extends LitElement {
         : ""}
       ${isResources
         ? html` <wr-coll-resources
-            .collInfo="${this.collInfo}"
+            .collInfo="${this.collInfo || {}}"
             .active="${isResources}"
             query="${this.tabData.query || ""}"
             urlSearchType="${this.tabData.urlSearchType || ""}"
@@ -1642,7 +1658,7 @@ class Coll extends LitElement {
   }
 
   async deleteFully(reload = false) {
-    const deleteURL = this.collInfo.apiPrefix + (reload ? "?reload=1" : "");
+    const deleteURL = this.collInfo!.apiPrefix + (reload ? "?reload=1" : "");
 
     const resp = await fetch(deleteURL, {
       method: "DELETE",
@@ -1663,7 +1679,7 @@ class Coll extends LitElement {
 
   onSubmit(event) {
     event.preventDefault();
-    const input = this.renderRoot.querySelector("input")!;
+    const input = this.renderRoot.querySelector("input") as HTMLInputElement;
     if (input.value) {
       this.navigateTo(input.value);
     } else {
diff --git a/src/index.d.ts b/src/index.d.ts
index dd4ab7e..b006a72 100644
--- a/src/index.d.ts
+++ b/src/index.d.ts
@@ -1 +1,2 @@
 declare module "*.svg";
+declare var __SW_NAME__: string;
diff --git a/src/replay.js b/src/replay.ts
similarity index 89%
rename from src/replay.js
rename to src/replay.ts
index 41d7c52..65262b6 100644
--- a/src/replay.js
+++ b/src/replay.ts
@@ -1,44 +1,49 @@
 import { LitElement, html, css } from "lit";
+import { property, state } from "lit/decorators.js";
+
 import { wrapCss, rwpLogo } from "./misc";
+import type { Coll } from "./types";
 
 // ===========================================================================
 class Replay extends LitElement {
-  constructor() {
-    super();
-    this.replayUrl = "";
-    this.replayTS = "";
-    this.actualTS = "";
-    this.url = "";
-    this.ts = "";
-    this.title = "";
-    this.collInfo = null;
+  @property({ type: Object })
+  collInfo: Coll | Record<string, never> | null = null;
 
-    this.showAuth = false;
-    this.reauthWait = null;
-    this.authFileHandle = null;
-  }
+  @property({ type: String })
+  sourceUrl: any = null;
 
-  static get properties() {
-    return {
-      collInfo: { type: Object },
-      sourceUrl: { type: String },
+  // external url set from parent
+  @property({ type: String })
+  url = "";
 
-      // external url set from parent
-      url: { type: String },
-      ts: { type: String },
+  @property({ type: String })
+  ts = "";
 
-      // actual replay url
-      replayUrl: { type: String },
-      replayTS: { type: String },
-      actualTS: { type: String },
-      title: { type: String },
+  // actual replay url
+  @property({ type: String })
+  replayUrl = "";
 
-      iframeUrl: { type: String },
+  @property({ type: String })
+  replayTS = "";
 
-      showAuth: { type: Boolean },
-      authFileHandle: { type: Object },
-    };
-  }
+  @property({ type: String })
+  actualTS = "";
+
+  @property({ type: String })
+  title = "";
+
+  @property({ type: String })
+  iframeUrl: any = null;
+
+  @property({ type: Boolean })
+  showAuth = false;
+
+  @property({ type: Object })
+  authFileHandle: any = null;
+
+  private reauthWait: null | Promise<void> = null;
+
+  private _loadPoll: null | number = null;
 
   firstUpdated() {
     window.addEventListener("message", (event) => this.onReplayMessage(event));
@@ -81,9 +86,10 @@ class Replay extends LitElement {
   }
 
   doSetIframeUrl() {
-    this.iframeUrl = this.url
-      ? `${this.collInfo.replayPrefix}/${this.ts || ""}mp_/${this.url}`
-      : "";
+    this.iframeUrl =
+      this.url && this.collInfo
+        ? `${this.collInfo.replayPrefix}/${this.ts || ""}mp_/${this.url}`
+        : "";
   }
 
   updated(changedProperties) {
@@ -199,7 +205,7 @@ class Replay extends LitElement {
         // google drive reauth
         const headers = event.detail.headers;
 
-        await fetch(`${this.collInfo.apiPrefix}/updateAuth`, {
+        await fetch(`${this.collInfo!.apiPrefix}/updateAuth`, {
           method: "POST",
           body: JSON.stringify({ headers }),
         });
@@ -231,7 +237,7 @@ class Replay extends LitElement {
         !iframe.contentDocument ||
         !iframe.contentWindow ||
         (iframe.contentDocument.readyState === "complete" &&
-          !iframe.contentWindow._WBWombat)
+          !(iframe.contentWindow as Window & { _WBWombat: any })._WBWombat)
       ) {
         this.clearLoading(iframe && iframe.contentWindow);
       }
@@ -273,7 +279,7 @@ class Replay extends LitElement {
     this.doSetIframeUrl();
     if (oldIframeUrl === this.iframeUrl || this.url === this.replayUrl) {
       this.waitForLoad();
-      iframe.contentWindow.location.reload();
+      iframe.contentWindow?.location.reload();
     }
   }
 
@@ -394,7 +400,7 @@ class Replay extends LitElement {
                               `
                             : html` <wr-gdrive
                                 .sourceUrl="${this.sourceUrl}"
-                                .state="trymanual"
+                                state="trymanual"
                                 .reauth="${true}"
                                 @load-ready="${this.onReAuthed}"
                               ></wr-gdrive>`}
diff --git a/src/types.ts b/src/types.ts
new file mode 100644
index 0000000..3ea8f16
--- /dev/null
+++ b/src/types.ts
@@ -0,0 +1,17 @@
+export interface Coll {
+  filename: string;
+  sourceUrl: string;
+  replayPrefix: string;
+  apiPrefix: string;
+  coll?: string;
+  name?: string;
+  title?: string;
+  loadUrl?: string;
+  desc?: string;
+  description?: string;
+  resources?: { path: string; name: string }[];
+  verify?: any;
+  onDemand?: any;
+  pages?: any[];
+  lists?: any[];
+}