fix(telemetry): avoid async import if telemetry disabled, fix for esbuild (#5086)

packages/better-auth/src/init.ts

@@ -100,13 +100,17 @@ export const init = async (options: BetterAuthOptions) => {
 		return generateId(size);
 	};
 
-	const { publish } = await createTelemetry(options, {
+	const { publish } = options.telemetry?.enabled
+		? await createTelemetry(options, {
 				adapter: adapter.id,
 				database:
 					typeof options.database === "function"
 						? "adapter"
 						: getKyselyDatabaseType(options.database) || "unknown",
-	});
+			})
+		: {
+				publish: async () => {},
+			};
 
 	let ctx: AuthContext = {
 		appName: options.appName || "Better Auth",

packages/better-auth/src/telemetry/index.ts

@@ -5,7 +5,9 @@ let lazyImportCreateTelemetry: Promise<
 export const createTelemetry: typeof import("./create-telemetry").createTelemetry =
 	async (...args) => {
 		if (!lazyImportCreateTelemetry) {
-			lazyImportCreateTelemetry = import("./create-telemetry").then(
+			// keep esbuild from following dynamic import during bundling
+			const importPath = "./create-telemetry";
+			lazyImportCreateTelemetry = import(importPath).then(
 				(mod) => mod.createTelemetry,
 			);
 		}