diff --git a/docs/hello-state/api.wasm b/docs/hello-state/api.wasm
index edced6d..ff4dec6 100755
Binary files a/docs/hello-state/api.wasm and b/docs/hello-state/api.wasm differ
diff --git a/docs/hello/api.wasm b/docs/hello/api.wasm
index 9d414c0..d3cf2f8 100755
Binary files a/docs/hello/api.wasm and b/docs/hello/api.wasm differ
diff --git a/internal/whutil/package.go b/internal/whutil/package.go
deleted file mode 100644
index 561cde7..0000000
--- a/internal/whutil/package.go
+++ /dev/null
@@ -1,4 +0,0 @@
-// Package whutil stands for WASM HTTP utilities.
-//
-// It contains internal utilities for github.com/nlepage/go-wasm-http-server.
-package whutil
diff --git a/internal/whutil/promise.go b/promise.go
similarity index 73%
rename from internal/whutil/promise.go
rename to promise.go
index 3e95959..989a332 100644
--- a/internal/whutil/promise.go
+++ b/promise.go
@@ -1,24 +1,27 @@
-package whutil
+package wasmhttp
 
 import (
 	"syscall/js"
 )
 
-// Promise is JS Promise
+// Promise is a JavaScript Promise
 type Promise struct {
 	js.Value
 }
 
-type PromiseResolve func(...interface{}) js.Value
-
-type PromiseReject func(...interface{}) js.Value
-
-// NewPromise creates a new JS Promise
-func NewPromise(cb func(resolve PromiseResolve, reject PromiseReject)) Promise {
+// NewPromise creates a new JavaScript Promise
+func NewPromise(cb func(resolve func(interface{}), reject func(interface{}))) Promise {
 	var cbFunc js.Func
 	cbFunc = js.FuncOf(func(_ js.Value, args []js.Value) interface{} {
 		defer cbFunc.Release()
-		cb(args[0].Invoke, args[1].Invoke)
+		cb(
+			func(value interface{}) {
+				args[0].Invoke(value)
+			},
+			func(value interface{}) {
+				args[1].Invoke(value)
+			},
+		)
 		return js.Undefined()
 	})
 	return Promise{js.Global().Get("Promise").New(cbFunc)}
diff --git a/internal/whutil/request.go b/request.go
similarity index 75%
rename from internal/whutil/request.go
rename to request.go
index b207506..9ebc204 100644
--- a/internal/whutil/request.go
+++ b/request.go
@@ -1,4 +1,4 @@
-package whutil
+package wasmhttp
 
 import (
 	"bytes"
@@ -6,13 +6,8 @@ import (
 	"syscall/js"
 )
 
-// Request is a JS Request
-type Request struct {
-	js.Value
-}
-
-// HTTPRequest builds and returns the equivalent http.Request
-func (r Request) HTTPRequest() (*http.Request, error) {
+// Request builds and returns the equivalent http.Request
+func Request(r js.Value) (*http.Request, error) {
 	jsBody := js.Global().Get("Uint8Array").New(Promise{r.Call("arrayBuffer")}.Await())
 	body := make([]byte, jsBody.Get("length").Int())
 	js.CopyBytesToGo(body, jsBody)
diff --git a/internal/whutil/response_writer.go b/response_writer.go
similarity index 98%
rename from internal/whutil/response_writer.go
rename to response_writer.go
index 848277a..c776c9c 100644
--- a/internal/whutil/response_writer.go
+++ b/response_writer.go
@@ -1,4 +1,4 @@
-package whutil
+package wasmhttp
 
 import (
 	"bytes"
diff --git a/serve.go b/serve.go
index 031d493..beb8c8c 100644
--- a/serve.go
+++ b/serve.go
@@ -5,8 +5,6 @@ import (
 	"net/http"
 	"strings"
 	"syscall/js"
-
-	"github.com/nlepage/go-wasm-http-server/internal/whutil"
 )
 
 // Serve serves HTTP requests using handler or http.DefaultServeMux if handler is nil.
@@ -28,9 +26,7 @@ func Serve(handler http.Handler) func() {
 	}
 
 	var cb = js.FuncOf(func(_ js.Value, args []js.Value) interface{} {
-		var jsReq = whutil.Request{args[0]}
-
-		var resPromise = whutil.NewPromise(func(resolve whutil.PromiseResolve, reject whutil.PromiseReject) {
+		var resPromise = NewPromise(func(resolve func(interface{}), reject func(interface{})) {
 			go func() {
 				defer func() {
 					if r := recover(); r != nil {
@@ -42,12 +38,12 @@ func Serve(handler http.Handler) func() {
 					}
 				}()
 
-				var req, err = jsReq.HTTPRequest()
+				var req, err = Request(args[0])
 				if err != nil {
 					panic(err)
 				}
 
-				var res = whutil.NewResponseWriter()
+				var res = NewResponseWriter()
 
 				h.ServeHTTP(res, req)