ts-loader bigint literal repro

app.ts

let a = 3n;

package.json

{
  "devDependencies": {
    "ts-loader": "^5.3.3",
    "typescript": "^3.3.3",
    "webpack": "^4.29.4",
    "webpack-cli": "^3.2.3"
  }
}

tsconfig.json

{
  "compilerOptions": {
    "target": "esnext",
    "lib": ["esnext"],
  }
}

webpack.config.js

module.exports = {
  mode: "development",
  devtool: "inline-source-map",
  entry: "./app.ts",
  output: {
    filename: "bundle.js"
  },
  resolve: {
    // Add `.ts` and `.tsx` as a resolvable extension.
    extensions: [".ts", ".tsx", ".js"]
  },
  module: {
    rules: [
      // all files with a `.ts` or `.tsx` extension will be handled by `ts-loader`
      { test: /\.tsx?$/, loader: "ts-loader" }
    ]
  }
};