change error message

koajs · Oct 30, 2015 · 27e50c7 · 27e50c7
1 parent fe32dd4
commit 27e50c7
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/index.js b/index.js
@@ -6,7 +6,7 @@ module.exports = convert
 
 function convert (mw) {
   if (typeof mw !== 'function') {
-    throw new TypeError(mw + ' is not function')
+    throw new TypeError('middleware must be a function')
   }
   if (mw.constructor.name === 'GeneratorFunction') {
     return function (ctx, next) {