fix: fix no construct signatures error throw by typescript

Author: icelam

src/index.ts

@@ -3,6 +3,15 @@ import HtmlInlineScriptPlugin from './HtmlInlineScriptPlugin';
 
 const isHtmlWebpackPluginV4 = 'getHooks' in htmlWebpackPlugin;
 
-module.exports = isHtmlWebpackPluginV4
-  ? HtmlInlineScriptPlugin
-  : null;
+if (!isHtmlWebpackPluginV4) {
+  // eslint-disable-next-line no-console
+  console.error(
+    '\x1b[35m%s \x1b[31m%s\x1b[0m',
+    '[html-inline-script-webpack-plugin]',
+    'Please upgrade your webpack to version 4 to use this plugin.'
+  );
+
+  throw new Error('VERSION_INCOMPATIBLE');
+}
+
+export = HtmlInlineScriptPlugin;