feat: Support webpack 5 emit (#41)

Now mini-html-webpack-plugin supports webpack 5 emit API while compatibility with webpack 4 is still retained.

Co-authored-by: Artem Sapegin <artem@sapegin.ru>

Author: bebraw

@types/test-utils.d.ts

@@ -0,0 +1,9 @@
+{
+  "scripts": {
+    "build": "wp"
+  },
+  "dependencies": {
+    "webpack-nano": "^1.1.0"
+  },
+  "main": "./src/index.js"
+}

example/package-lock.json

@@ -0,0 +1,7 @@
+const component = (text = 'Hello world') => {
+	const element = document.createElement('div');
+	element.innerHTML = text;
+	return element;
+};
+
+document.body.appendChild(component());

example/package.json

@@ -0,0 +1,7 @@
+// eslint-disable-next-line @typescript-eslint/no-var-requires
+const { MiniHtmlWebpackPlugin } = require('../');
+
+module.exports = {
+	mode: 'production',
+	plugins: [new MiniHtmlWebpackPlugin()],
+};

example/src/index.js

@@ -1,3 +1,9 @@
 module.exports = {
 	preset: 'ts-jest',
+	globals: {
+    'ts-jest': {
+      // Disable type-checking in Jest tests since we test separately
+      isolatedModules: true,
+    },
+  },
 };