electron_bridge: Declare Zulip Desktop binding types.

Signed-off-by: Anders Kaseorg <anders@zulip.com>

tools/test-js-with-node

@@ -98,6 +98,7 @@ EXEMPT_FILES = make_set(
         "web/src/drafts_overlay_ui.js",
         "web/src/dropdown_widget.js",
         "web/src/echo.js",
+        "web/src/electron_bridge.d.ts",
         "web/src/emoji_picker.js",
         "web/src/emojisets.ts",
         "web/src/favicon.ts",

web/src/electron_bridge.d.ts

@@ -0,0 +1,45 @@
+export type NotificationData = {
+    title: string;
+    dir: NotificationDirection;
+    lang: string;
+    body: string;
+    tag: string;
+    icon: string;
+    data: unknown;
+    close(): void;
+};
+
+export type ClipboardDecrypter = {
+    version: number;
+    key: Uint8Array;
+    pasted: Promise<string>;
+};
+
+export type ElectronBridge = {
+    send_event(eventName: string | symbol, ...args: unknown[]): boolean;
+    on_event(
+        eventName: "logout" | "show-keyboard-shortcuts" | "show-notification-settings",
+        listener: () => void,
+    ): void;
+    on_event(
+        eventName: "send_notification_reply_message",
+        listener: (message_id: unknown, reply: unknown) => void,
+    ): void;
+    new_notification?(
+        title: string,
+        options: NotificationOptions,
+        dispatch: (type: string, eventInit: EventInit) => boolean,
+    ): NotificationData;
+    get_idle_on_system?(): boolean;
+    get_last_active_on_system?(): number;
+    get_send_notification_reply_message_supported?(): boolean;
+    set_send_notification_reply_message_supported?(value: boolean): void;
+    decrypt_clipboard?(version: number): ClipboardDecrypter;
+};
+
+declare global {
+    // eslint-disable-next-line @typescript-eslint/consistent-type-definitions
+    interface Window {
+        electron_bridge?: ElectronBridge;
+    }
+}