Cannot deploy nest.js project to Google Firebase Functions

NestJs uses ES6, ES7 and ES8, but Firebase Functions is stuck at Node v.6.11.

I tried to write a webpack config file w/ babel to transpile both my files and the node_modules to node v6.11 but I'm not able to complete the deploy due to a syntax error caused by an async function in the @nestjs/common/interceptors/file-fields.interceptor.js file.

⚠  functions[api]: Deployment error.
Function load error: Code in file dist/index.js can't be loaded.
Is there a syntax error in your code?
Detailed stack trace: /user_code/node_modules/@nestjs/common/interceptors/file-fields.interceptor.js:10
        async intercept(context, call$) {
              ^^^^^^^^^

SyntaxError: Unexpected identifier
    at createScript (vm.js:56:10)
    at Object.runInThisContext (vm.js:97:10)
    at Module._compile (module.js:549:28)
    at Object.Module._extensions..js (module.js:586:10)
    at Module.load (module.js:494:32)
    at tryModuleLoad (module.js:453:12)
    at Function.Module._load (module.js:445:3)
    at Module.require (module.js:504:17)
    at require (internal/module.js:20:19)
    at Object.<anonymous> (/user_code/node_modules/@nestjs/common/interceptors/index.js:6:10)

Here's my webpack.config.js file:

'use strict';
const nodeExternals = require('webpack-node-externals');
module.exports = {
    entry: './src/server.ts',
    output: {
        filename: 'index.js',
        libraryTarget: 'this'
    },
    target: 'node',
    module: {
        rules: [
            {
                test: /\.tsx?$/,
                use: [
                    { 
                        loader: 'babel-loader',
                        options: {
                            presets: [
                                [
                                    '@babel/preset-env',
                                    {
                                        "targets": {
                                        "node": "6.11.1"
                                        }
                                    },
                                    '@babel/stage-0'
                                ]
                            ],
                            plugins: [require('@babel/plugin-transform-async-to-generator')]
                        }
                    }, 
                    {
                        loader: 'ts-loader',
                        options: {
                            transpileOnly: true
                        }
                    }
                ]
            },
            {
                test: /\.js$/,
                use: [
                    { 
                        loader: 'babel-loader',
                        options: {
                            presets: [
                                [
                                    '@babel/preset-env',
                                    {
                                        "targets": {
                                        "node": "6.11.1"
                                        }
                                    },
                                    '@babel/stage-0'
                                ]
                            ],
                            plugins: [require('@babel/plugin-transform-async-to-generator')]
                        }
                    }
                ]
            }
        ]
    },
    resolve: {
        extensions: [ '.ts', '.tsx', '.js' ]
    },
    externals: [nodeExternals()]
};

My tsconfig.json:

{
  "compilerOptions": {
    "lib": ["es6", "es2015.promise"],
    "module": "commonjs",
    "noImplicitAny": false,
    "outDir": "",
    "sourceMap": true,
    "removeComments": true,
    "noLib": false,
    "emitDecoratorMetadata": true,
    "experimentalDecorators": true,
    "allowJs": true,
    "target": "es6",
    "typeRoots": [
      "node_modules/@types"
    ]
  },
  "include": [
    "src/**/*.ts",
    "spec/**/*.ts"
  ],
  "exclude": [
    "**/*.spec.ts"
  ]
}

What's wrong?

from Cannot deploy nest.js project to Google Firebase Functions