feat: Dynamic imports

build.config.ts

@@ -0,0 +1,19 @@
+import { fileURLToPath } from "node:url";
+import { defineBuildConfig } from "unbuild";
+
+export default defineBuildConfig({
+  entries: [
+    "src/index.ts",
+    {
+      builder: "mkdist",
+      input: "src/services",
+      outDir: "dist",
+    },
+  ],
+  clean: false,
+  declaration: true,
+  rollup: {
+    emitCJS: true,
+  },
+  externals: [fileURLToPath(new URL("src/services", import.meta.url))],
+});

src/index.ts

@@ -1,36 +1,32 @@
-import { PlunkService } from "./services/plunk";
-import { PostmarkService } from "./services/postmark";
-import { ResendService } from "./services/resend";
-import { SendGridService } from "./services/sendgrid";
-import { MailgunService } from "./services/mailgun";
 import type { EmailProvider } from "./types/email-options";
 import type { EmailService } from "./types/email-service";
 
 /**
  * Factory function to get the email service based on the provider
  * @param provider - The email provider
- * @returns The email service instance
+ * @returns A Promise that resolves to the email service instance
  * @throws Error if the provider is not supported
  */
-export function useEmail(provider: EmailProvider): EmailService {
+export async function useEmail(provider: EmailProvider): Promise<EmailService> {
   switch (provider) {
     case "resend": {
+      const { ResendService } = await import("./services/resend");
       return new ResendService();
     }
     case "plunk": {
+      const { PlunkService } = await import("./services/plunk");
       return new PlunkService();
     }
     case "sendgrid": {
+      const { SendGridService } = await import("./services/sendgrid");
       return new SendGridService();
     }
     case "postmark": {
+      const { PostmarkService } = await import("./services/postmark");
       return new PostmarkService();
     }
-    case "mailgun": {
-      return MailgunService();
-    }
     default: {
       throw new Error(`Unsupported email provider: ${provider}`);
     }
   }
 }