feat(ts): Add types and ts documentation

Signed-off-by: Roberto Bianchi <[email protected]>

index.d.ts

@@ -0,0 +1,14 @@
+import fastify, {
+  type FastifyBaseLogger,
+  type FastifyReply,
+  type FastifyRequest,
+} from "fastify";
+
+declare namespace fastifyasyncforge {
+  export const app: typeof fastify;
+  export const request: FastifyRequest;
+  export const reply: FastifyReply;
+  export const logger: FastifyBaseLogger;
+}
+
+export = fastifyasyncforge;

index.test-d.ts

@@ -0,0 +1,36 @@
+import { expectAssignable, expectError, expectType } from "tsd";
+import { app, logger, reply, request } from ".";
+import fastify, {
+  type FastifyInstance,
+  type FastifyBaseLogger,
+  type FastifyRequest,
+  type FastifyReply,
+} from "fastify";
+
+const fastifyInstance = fastify();
+const appInstance = app();
+
+// app
+expectAssignable<FastifyInstance>(fastifyInstance);
+expectAssignable<FastifyInstance>(appInstance);
+expectError<FastifyInstance>({});
+
+// request
+expectType<FastifyRequest>(request);
+expectType<unknown>(request.body);
+expectType<boolean>(request.is404);
+expectError<FastifyRequest>({});
+
+// reply
+expectType<FastifyReply>(reply);
+expectType<number>(reply.statusCode);
+expectType<boolean>(reply.sent);
+expectError<FastifyReply>({});
+
+// logger
+expectType<FastifyBaseLogger>(fastifyInstance.log);
+expectType<FastifyBaseLogger>(logger);
+expectType<void>(logger.debug({ msg: "hey" }));
+expectType<void>(logger.info({ msg: "oh!" }));
+expectType<void>(logger.warn({ msg: "let's go!!!" }));
+expectError<FastifyBaseLogger>({});