Identifying memory leak in webpack build

I was wondering if someone could point me in the right direction here.

When I run my development server, and some times even the production server the build crashes sporadically saying the javascript heap is out of memory. I've tried attaching a debugger to webpack and as far as I can see it fails on parsing the less-files, but I've also seen it happen running at different stages as well.

I have absolutely no clue how to proceed in fixing this issue, but something tells me I have to fix the issue, as compared to the standard "just increase node's --max-old-space-size". I've already doubled the heap space twice and still experience the error some times. At the moment I've set it to use 8gb of ram, but it still fails.

I've attached a screenshot of debugger from when the debugger halted on a potential out of memory crash. As you probably guessed, I am fairly new to Webpack and would appreciate any hint on how I can get to the root of this problem as it is really impacting my workflow.

webpack.config.js

// Path to the output folder
const rootFolder = "wwwroot";
const bundleFolder = `${rootFolder}/bundle`;

const customers = [
    // ### Removed
];

let entry = {
  load: "./ClientApp/load.ts",
  main: "./ClientApp/main.ts",
};
customers.forEach((e) => {
  entry[e] = `./ClientApp/www_files/${e}/${e}.ts`;
});

module.exports = (env, args) => {
  const devMode = args.mode !== "production";

  return {
    entry: entry,
    output: {
      path: path.resolve(__dirname, bundleFolder),
      publicPath: " ### Removed",
      filename: "[name].js",
      chunkFilename: "[id].[name].[chunkhash].js",
    },
    module: {
      rules: [
        {
          test: /\.vue$/,
          loader: "vue-loader",
        },
        {
          test: /\.js$/,
          loader: "babel-loader",
          query: {
            presets: ["es2015"],
            compact: devMode,
          },
        },
        {
          test: /\.ts?$/,
          use: [
            {
              loader: "awesome-typescript-loader",
            },
          ],
        },
        {
          test: /\.css$/,
          use: [
            devMode ? "vue-style-loader" : MiniCssExtractPlugin.loader,
            "css-loader",
          ],
        },
        {
          test: /\.scss$/,
          use: [
            devMode ? "vue-style-loader" : MiniCssExtractPlugin.loader,
            "css-loader",
            "sass-loader",
          ],
        },
        {
          test: /\.less$/,
          use: [
            devMode ? "vue-style-loader" : MiniCssExtractPlugin.loader,
            "css-loader",
            "less-loader",
          ],
        },
        {
          test: /\.(png|jpg|gif|svg)$/,
          loader: "file-loader",
          options: {
            name: "[name].[ext]?[hash]",
          },
        },
        {
          test: /\.woff(\?v=\d+\.\d+\.\d+)?$/,
          loader: "file-loader",
        },
        {
          test: /\.woff2(\?v=\d+\.\d+\.\d+)?$/,
          loader: "file-loader",
        },
        {
          test: /\.ttf(\?v=\d+\.\d+\.\d+)?$/,
          loader: "file-loader",
        },
        {
          test: /\.eot(\?v=\d+\.\d+\.\d+)?$/,
          loader: "file-loader",
        },
        {
          test: /\.svg(\?v=\d+\.\d+\.\d+)?$/,
          loader: "file-loader",
        },
        {
          test: /\.(html)$/,
          use: {
            loader: "html-loader",
            options: {
              attrs: [":data-src"],
            },
          },
        },
        {
          resourceQuery: /blockType=i18n/,
          type: "javascript/auto",
          loader: "@kazupon/vue-i18n-loader",
        },
      ],
    },
    resolve: {
      extensions: [".ts", ".js", ".vue", ".json"],
      alias: {
        vue$: "vue/dist/vue.esm.js",
      },
    },
    devServer: {
      contentBase: bundleFolder,
      // Added because of bug: https://github.com/webpack/webpack-dev-server/issues/1604
      disableHostCheck: true,
      hot: true,
      overlay: true,
      headers: {
        "Access-Control-Allow-Origin": "*",
        "Access-Control-Allow-Methods":
          "GET, POST, PUT, DELETE, PATCH, OPTIONS",
        "Access-Control-Allow-Headers":
          "X-Requested-With, content-type, Authorization",
      },
      port: 8080,
    },
    optimization: {
      minimizer: [
        new TerserPlugin(),
        new OptimizeCssAssetsPlugin({}),
      ],
    },
    plugins: [
      new CleanWebpackPlugin([bundleFolder]),
      new webpack.HotModuleReplacementPlugin(),
      new VueLoaderPlugin(),
      new CheckerPlugin(),
      new MiniCssExtractPlugin({
        filename: "[name].css",
        chunkFilename: "[id].[name].[chunkhash].css",
      }),
      new HardSourceWebpackPlugin(),
      new webpack.IgnorePlugin(/^\.\/locale$/, /moment$/),
    ],
  };
};