fix: make webpack 4 compatible (#98)

Author: macisi

package.json

@@ -55,18 +55,19 @@
     "eslint": "^5.6.0",
     "eslint-config-simenb-base": "^15.0.0",
     "eslint_d": "^7.1.0",
-    "html-webpack-plugin": "^2.10.0",
+    "html-webpack-plugin": "^3.0.4",
     "husky": "^0.14.3",
     "in-publish": "^2.0.0",
     "jest": "^23.6.0",
     "jest-watch-typeahead": "^0.2.0",
     "licensor": "^4.0.0",
     "lint-staged": "^7.0.0",
     "prettier": "^1.8.2",
-    "webpack": "^3.5.6"
+    "webpack": "^4.0.0",
+    "webpack-cli": "^3.1.0"
   },
   "peerDependencies": {
-    "html-webpack-plugin": "^2.10.0 || ^3.0.4"
+    "html-webpack-plugin": "^3.0.4"
   },
   "engines": {
     "node": ">=6"

src/addAllAssetsToCompilation.js

@@ -112,6 +112,6 @@ export default async function(assets, compilation, htmlPluginData, callback) {
     if (callback) {
       return callback(e, htmlPluginData);
     }
-    throw e;
+    throw new Error(e);
   }
 }

src/index.js

@@ -10,13 +10,14 @@ export default class AddAssetHtmlPlugin {
     compiler.plugin('compilation', compilation => {
       compilation.plugin(
         'html-webpack-plugin-before-html-generation',
-        (htmlPluginData, callback) =>
-          addAllAssetsToCompilation(
+        async (htmlPluginData, callback) => {
+          await addAllAssetsToCompilation(
             this.assets,
             compilation,
             htmlPluginData,
             callback,
-          ),
+          );
+        },
       );
     });
   }