refactor(test): include webpack config in karma config

So it is clear that this webpack config is only necessary for Karma.

karma.conf.cjs

@@ -1,34 +1,49 @@
-process.env.CHROME_BIN = require("puppeteer").executablePath();
-const webpackConfig = require("./webpack.config.cjs");
-const webpack = require("webpack");
+process.env.CHROME_BIN = require('puppeteer').executablePath();
+const webpack = require('webpack');
 
-module.exports = function (config) {
+module.exports = function(config) {
   config.set({
-    frameworks: ["webpack", "mocha"],
-    files: ["src/lib/**/!(node).spec.ts"],
+    frameworks: ['webpack', 'mocha'],
+    files: ['src/lib/**/!(node).spec.ts'],
     preprocessors: {
-      "src/lib/**/!(node).spec.ts": ["webpack"],
+      'src/lib/**/!(node).spec.ts': ['webpack']
     },
-    envPreprocessor: ["CI"],
-    reporters: ["progress"],
-    browsers: ["ChromeHeadless"],
+    envPreprocessor: ['CI'],
+    reporters: ['progress'],
+    browsers: ['ChromeHeadless'],
     singleRun: true,
     client: {
       mocha: {
-        timeout: 6000, // Default is 2s
-      },
+        timeout: 6000 // Default is 2s
+      }
     },
     webpack: {
-      mode: "production",
-      module: webpackConfig.module,
+      mode: 'production',
+      module: {
+        rules: [
+          {
+            test: /\.(js|tsx?)$/,
+            use: 'ts-loader',
+            exclude: /(node_modules)|(node\.spec\.ts)/
+          },
+          {
+            test: /node\.spec\.ts$/,
+            use: 'ignore-loader'
+          }
+        ]
+      },
       plugins: [
         new webpack.DefinePlugin({
-          "process.env.CI": process.env.CI || false,
+          'process.env.CI': process.env.CI || false
         }),
-        ...webpackConfig.plugins,
+        new webpack.ProvidePlugin({
+          process: 'process/browser.js'
+        })
       ],
-      resolve: webpackConfig.resolve,
-      stats: { warnings: false },
-    },
+      resolve: {
+        extensions: ['.ts', '.js']
+      },
+      stats: { warnings: false }
+    }
   });
 };

webpack.config.cjs

@@ -1,50 +0,0 @@
-const webpack = require("webpack");
-const path = require("path");
-
-module.exports = {
-  mode: "development",
-  entry: {
-    "js-waku": "./src/index.ts",
-  },
-  devtool: "inline-source-map",
-  module: {
-    rules: [
-      {
-        test: /\.(js|tsx?)$/,
-        use: "ts-loader",
-        exclude: /(node_modules)|(node\.spec\.ts)/,
-      },
-      {
-        test: /node\.spec\.ts$/,
-        use: "ignore-loader",
-      },
-    ],
-  },
-  plugins: [
-    new webpack.ProvidePlugin({
-      process: "process/browser.js",
-      Buffer: ["buffer", "Buffer"],
-    }),
-  ],
-  resolve: {
-    extensions: [".ts", ".js"],
-    fallback: {
-      buffer: require.resolve("buffer/"),
-      crypto: false,
-      stream: require.resolve("stream-browserify"),
-    },
-  },
-  output: {
-    filename: "[name].js",
-    path: path.resolve(__dirname, "build/umd"),
-    library: "jswaku",
-    libraryTarget: "umd",
-    globalObject: "this",
-  },
-  optimization: {
-    splitChunks: {
-      name: "vendors",
-      chunks: "all",
-    },
-  },
-};