diff --git a/package.json b/package.json
index e588c2d..0364f6c 100644
--- a/package.json
+++ b/package.json
@@ -52,7 +52,7 @@
   },
   "private": true,
   "lint-staged": {
-    "*.{js,ts,jsx,tsx}": "eslint --cache --fix . || true",
+    "*.{js,ts,jsx,tsx}": "cmd /c eslint --cache --fix . || exit 0",
     "*.{js,ts,jsx,tsx,json,css,md}": "prettier --write"
   },
   "dependencies": {
diff --git a/src/index.ts b/src/index.ts
index 7f7c238..379721c 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -1 +1,107 @@
-console.log("Happy developing ✨");
+import { z } from "zod";
+
+const messageSchema = z.object({
+  /**
+   * The message to send.
+   */
+  message: z.string(),
+  /**
+   * The title of the message.
+   */
+  title: z.string().optional(),
+  /**
+   * The URL to open when the notification is clicked.
+   */
+  url: z
+    .object({
+      /**
+       * The URL itself.
+       */
+      url: z.string(),
+      /**
+       * The title of the URL to be displayed.
+       */
+      title: z.string().optional(),
+    })
+    .optional(),
+  priority: z
+    .object({
+      level: z.number().default(0),
+      retry: z.number().optional(),
+      expire: z.number().optional(),
+      callback: z.string().optional(),
+    })
+    .optional(),
+  sound: z.string().optional(),
+  timestamp: z.date().optional(),
+  html: z.boolean().default(false),
+  attachment: z
+    .object({
+      data: z.string().or(z.instanceof(File)),
+      type: z.string(),
+    })
+    .optional(),
+  users: z.array(
+    z.object({
+      name: z.string(),
+      token: z.string(),
+      devices: z.array(z.string()),
+    }),
+  ),
+  appToken: z.string(),
+});
+
+export type PushoverMessage = z.infer<typeof messageSchema>;
+
+export type Pushover = {
+  // #################################
+  // #            Helpers            #
+  // #################################
+
+  /**
+   * Get all available sounds.
+   */
+  getSounds: () => { sounds: string[] };
+
+  /**
+   * Get all available devices for a user.
+   */
+  getDevices: (userToken: string) => { devices: string[] };
+
+  // #################################
+  // #            Sending            #
+  // #################################
+
+  /**
+   * Send the notification.
+   */
+  send: () => void;
+
+  // #################################
+  // #            Options            #
+  // #################################
+  withMessage: (message: string) => Pushover;
+  withTitle: (title: string) => Pushover;
+  withUrl: (url: { url: string; title: string }) => Pushover;
+  withPriority: (priority: {
+    level: number;
+    retry?: number;
+    expire?: number;
+    callback?: string;
+  }) => Pushover;
+  withSound: (sound: string) => Pushover;
+  withTimestamp: (timestamp: number) => Pushover;
+  withHtml: (enable: boolean) => Pushover;
+  withAttachment: (attachment: File) => Pushover;
+  withBase64Attachment: (attachment: {
+    data: string;
+    type: string;
+  }) => Pushover;
+  addUsers: (users: User[]) => Pushover;
+};
+
+export type User = {
+  name: string;
+  token: string;
+  devices: string[];
+};