chore: import upstream snapshot with attribution

javascript/webpack.config.js

@@ -0,0 +1,54 @@
+var path = require("path");
+// To build use `webpack --mode production` then copy bundle.js to resources
+
+var buildDir = path.resolve(__dirname, "build");
+
+var moduleConfig = {
+  rules: [
+    {
+      test: /\.css$/,
+      use: ["style-loader", "css-loader"]
+    },
+    {
+      test: /\.js[x]?$/,
+      exclude: /(node_modules)/,
+      loader: "babel-loader",
+      options: {
+        presets: ["@babel/preset-env", "@babel/preset-react"]
+      }
+    }
+  ]
+};
+
+var resolveConfig = {
+  extensions: ["*", ".js", ".jsx", ".json"]
+};
+module.exports = [
+  {
+    entry: {
+      bundle: "./index.jsx",
+      test_bundle: "./test_bundle.js"
+    },
+    output: {
+      path: buildDir,
+      filename: "[name].js"
+    },
+    module: moduleConfig,
+    resolve: resolveConfig,
+    devServer: {
+      static: buildDir
+    }
+  },
+  {
+    entry: {
+      index: "./visualizers/index.jsx"
+    },
+    output: {
+      path: buildDir,
+      filename: "[name].js",
+      libraryTarget: "commonjs2"
+    },
+    module: moduleConfig,
+    resolve: resolveConfig
+  }
+];