feat: automatically enable allowHTTP1 by default with http2 & hmr

.gitignore

@@ -15,3 +15,6 @@ wps-hmr.*
 coverage.lcov
 
 dist
+
+*.pem
+*.key

README.md

@@ -138,7 +138,7 @@ If `true`, will enable [`Hot Module Replacement`](https://webpack.js.org/concept
 
 _Note: If the build process generates errors, the client (browser) will not be notified of new changes and no HMR will be performed. Errors must be resolved before HMR can proceed. To force a refresh, pass `refresh-on-failure' to this option._
 
-_Note: If using in combination with `http2`, the `http2` option `allowHTTP1` must be enabled for the HMR WS connection to work._
+_Note: If using in combination with `http2`, the `http2` option `allowHTTP1` will be enabled by default for the HMR WS connection to work._
 
 ### `host`
 Type: `String | Promise`<br>
@@ -151,9 +151,9 @@ _Note: The default URI is `http://[::]:{port}`. For more info, please read [the
 ### `http2`
 Type: `boolean` | [`http2` options](https://nodejs.org/api/http2.html#http2_http2_createserver_options_onrequesthandler) | [secure `http2` options](https://nodejs.org/api/http2.html#http2_http2_createsecureserver_options_onrequesthandler)
 
-If set, this option will instruct the server to enable HTTP2. Properties for this option should correspond to [HTTP2 options][http2] or [HTTP2 SSL options][http2tls].
+If set, this option will instruct the server to enable HTTP2. Properties for this option should correspond to [HTTP2 options][http2] or [HTTP2 SSL options][http2tls]. Browsers currently do not support unencrypted HTTP2 connections, so you will need to enable SSL for this to work properly.
 
-_Note: If using in combination with `hmr`, the option `allowHTTP1` must be enabled for the HMR WS connection to work._
+_Note: If using in combination with `hmr`, the option `allowHTTP1` will be enabled by default for the HMR WS connection to work._
 
 ### `https`
 Type: `Object`<br>

lib/server.js

@@ -24,18 +24,19 @@ const select = (options, callback) => {
     http2: require('http2').createServer,
     http2Secure: require('http2').createSecureServer
   };
-  const { http2, https } = options;
+  const { http2, https, hmr } = options;
   let server;
   let secure = false;
 
   if (http2) {
+    const defaultOptions = hmr === true ? { allowHTTP1: true } : {};
     if (http2 === true) {
-      server = types.http2({}, callback);
+      server = types.http2(defaultOptions, callback);
     } else if (http2.cert) {
       secure = true;
-      server = types.http2Secure(http2, callback);
+      server = types.http2Secure({ ...defaultOptions, ...http2 }, callback);
     } else {
-      server = types.http2(http2, callback);
+      server = types.http2({ ...defaultOptions, ...http2 }, callback);
     }
   } else if (https) {
     secure = true;