diff --git a/public/global.d.ts b/public/global.d.ts
new file mode 100644
index 00000000..84b76275
--- /dev/null
+++ b/public/global.d.ts
@@ -0,0 +1,89 @@
+// Import Third-party Dependencies
+import type { HLJSApi } from "highlight.js";
+
+// Import Internal Dependencies
+import type { Settings } from "./components/views/settings/settings.js";
+import type { ViewNavigation } from "./components/navigation/navigation.js";
+import type { Wiki } from "./components/wiki/wiki.js";
+import type { NetworkNavigation } from "./core/network-navigation.js";
+import type { WebSocketClient } from "./websocket.js";
+
+declare global {
+  interface Window {
+    /**
+     * Cached package specifications received from the server (e.g. `"express@4.18.0"`).
+     * Populated on the `INIT` / `RELOAD` WebSocket events.
+     */
+    cachedSpecs: string[];
+
+    /**
+     * The `<nsecure-locker>` custom element placed in the network view.
+     * `null` until the network dataset is first loaded.
+     */
+    locker: (HTMLElement & { nsn: unknown }) | null;
+
+    /**
+     * Application settings instance, hydrated from the `/config` endpoint.
+     * Contains the active theme, ignored warnings/flags, and other UI preferences.
+     */
+    settings: Settings;
+
+    /**
+     * Localisation dictionary fetched from `/i18n`.
+     * Indexed as `window.i18n[lang][section][key]`.
+     */
+    i18n: Record<string, Record<string, Record<string, string>>>;
+
+    /**
+     * Controls which top-level view (network / home / settings / search) is active.
+     */
+    navigation: ViewNavigation;
+
+    /**
+     * The slide-in documentation / wiki panel controller.
+     */
+    wiki: Wiki;
+
+    /**
+     * The currently active package displayed in the network graph, in `"name@version"` format.
+     */
+    activePackage: string;
+
+    /**
+     * Vulnerability strategy identifier coming from the loaded `NodeSecureDataSet`
+     * (e.g. `"npm"`, `"sonatype"`, …).
+     */
+    vulnerabilityStrategy: string;
+
+    /**
+     * Keyboard / arrow-key navigation controller for the dependency network graph.
+     */
+    networkNav: NetworkNavigation;
+
+    /**
+     * The `<nsecure-legend>` custom element rendered in the network view.
+     * Exposes `show()` / `hide()` helpers and the reactive `isVisible` property.
+     */
+    legend: HTMLElement & { isVisible: boolean; show(): void; hide(): void };
+
+    /**
+     * WebSocket client used to communicate with the local nsecure server.
+     * Assigned during app startup; dispatches typed `CustomEvent`s via `EventTarget`.
+     */
+    socket: WebSocketClient;
+
+    /**
+     * The currently expanded `<expandable-span>` legend element.
+     * `null` when no legend item is open.
+     */
+    activeLegendElement: HTMLElement | null;
+
+    /**
+     * The `highlight.js` core instance, exposed globally for the inline code-fetcher widget.
+     * The `highlightjs-line-numbers` plugin attaches `initLineNumbersOnLoad` at runtime.
+     */
+    hljs: HLJSApi & { initLineNumbersOnLoad(): void };
+  }
+}
+
+export {};
diff --git a/public/jsconfig.json b/public/jsconfig.json
new file mode 100644
index 00000000..da73add0
--- /dev/null
+++ b/public/jsconfig.json
@@ -0,0 +1,10 @@
+{
+  "compilerOptions": {
+    "checkJs": false,
+    "lib": ["dom", "dom.iterable", "ESNext"],
+    "module": "ESNext",
+    "moduleResolution": "bundler",
+    "target": "ESNext"
+  },
+  "include": ["./**/*.js", "./global.d.ts"]
+}