fix(index): remove default export and rename createMiddleware

as building default export of this package makes CommonJS users
need to access it via 'default' property, as there is no perfect
way to handle this due to a TypeScript issue, remove default export
and export createMiddleware so it is accessible via a property; rename
createMiddleware to createMockMiddleware that I personnaly find more meaningful;
update index spec and app testing

#9

src/index.spec.ts

@@ -2,11 +2,11 @@ import path from 'path';
 
 import { Router } from 'express';
 
-import createMiddleware from './index';
+import { createMockMiddleware } from './index';
 
-describe('createMiddleware', () => {
+describe('createMockMiddleware', () => {
   it('should return an instance of the express router', async () => {
-    const middleware = createMiddleware({
+    const middleware = createMockMiddleware({
       file: path.resolve(__dirname, '../test/fixtures/petstore.yaml'),
     });
 
@@ -15,7 +15,7 @@ describe('createMiddleware', () => {
 
   it('should throw an error if the given file does not exist', () => {
     try {
-      createMiddleware({
+      createMockMiddleware({
         file: path.resolve(__dirname, '../test/fixtures/petstore_not_exist.yaml'),
       });
       throw new Error('exit');

src/index.ts

@@ -19,7 +19,7 @@ export interface MiddlewareOptions {
   options?: Partial<JSFOptions>;
 }
 
-const createMiddleware = ({
+export const createMockMiddleware = ({
   file,
   locale = 'en',
   options = {},
@@ -52,5 +52,3 @@ const createMiddleware = ({
 
   return router;
 };
-
-export default createMiddleware;

test/helpers/app.ts

@@ -2,11 +2,11 @@ import path from 'path';
 
 import express from 'express';
 
-import createMiddleware from '../../src';
+import { createMockMiddleware } from '../../src';
 
 const app = express();
 
-const middleware = createMiddleware({
+const middleware = createMockMiddleware({
   file: path.resolve(__dirname, '../fixtures/petstore.yaml'),
 });