Update webpack (#430)

* Update webpack

* also install dev dependencies in CI

* Add rimraf

* fix added whitespace

* Clarify node warnings and NPM compatibility

webpack.config.js

@@ -18,7 +18,7 @@ const moduleRules = [
   },
   {
     test: /\.ts$/,
-    loaders: ["ts-loader"],
+    use: "ts-loader",
     exclude: path.resolve(__dirname, "node_modules"),
   },
 ];
@@ -35,7 +35,10 @@ const plugins = [
     banner: "#!/usr/bin/env node",
     raw: true,
   }),
-  new webpack.IgnorePlugin(/^encoding$/, /node-fetch/),
+  new webpack.IgnorePlugin({
+    resourceRegExp: /^encoding$/,
+    contextRegExp: /node-fetch/,
+  }),
 ];
 
 const config = {