diff --git a/src/public/app/widgets/api_log.js b/src/public/app/widgets/api_log.ts
similarity index 77%
rename from src/public/app/widgets/api_log.js
rename to src/public/app/widgets/api_log.ts
index a3c7e41d3..d2b833a71 100644
--- a/src/public/app/widgets/api_log.js
+++ b/src/public/app/widgets/api_log.ts
@@ -1,3 +1,5 @@
+import type { EventData } from "../components/app_context.js";
+import type FNote from "../entities/fnote.js";
 import { t } from "../services/i18n.js";
 import NoteContextAwareWidget from "./note_context_aware_widget.js";
 
@@ -10,16 +12,16 @@ const TPL = `
         max-height: 40%;
         position: relative;
     }
-    
+
     .hidden-api-log {
         display: none;
     }
-    
+
     .api-log-container {
         overflow: auto;
         height: 100%;
     }
-    
+
     .close-api-log-button {
         padding: 5px;
         border: 1px solid var(--button-border-color);
@@ -32,15 +34,19 @@ const TPL = `
         cursor: pointer;
     }
     </style>
-    
+
     <div class="bx bx-x close-api-log-button" title="${t("api_log.close")}"></div>
-   
+
     <div class="api-log-container"></div>
 </div>`;
 
 export default class ApiLogWidget extends NoteContextAwareWidget {
+
+    private $logContainer!: JQuery<HTMLElement>;
+    private $closeButton!: JQuery<HTMLElement>;
+
     isEnabled() {
-        return this.note && this.note.mime.startsWith("application/javascript;env=") && super.isEnabled();
+        return !!this.note && this.note.mime.startsWith("application/javascript;env=") && super.isEnabled();
     }
 
     doRender() {
@@ -52,11 +58,11 @@ export default class ApiLogWidget extends NoteContextAwareWidget {
         this.$closeButton.on("click", () => this.toggle(false));
     }
 
-    async refreshWithNote(note) {
+    async refreshWithNote(note: FNote) {
         this.$logContainer.empty();
     }
 
-    apiLogMessagesEvent({ messages, noteId }) {
+    apiLogMessagesEvent({ messages, noteId }: EventData<"apiLogMessages">) {
         if (!this.isNote(noteId)) {
             return;
         }
@@ -68,7 +74,7 @@ export default class ApiLogWidget extends NoteContextAwareWidget {
         }
     }
 
-    toggle(show) {
+    toggle(show: boolean) {
         this.$widget.toggleClass("hidden-api-log", !show);
     }
 }