Can't resolve parameters for app module

I'm trying to run a hybrid app with angular 1.6 and 5. The manual bootstraping worked. As soon as I tried to bootstrap a hybrid application, I get the following error:

compiler.js?7e34:466 Uncaught Error: Can't resolve all parameters for AppModule: (?). at syntaxError (eval at (app.bundle.js:1852), :684:34) at CompileMetadataResolver._getDependenciesMetadata (eval at (app.bundle.js:1852), :15765:35) at CompileMetadataResolver._getTypeMetadata (eval at (app.bundle.js:1852), :15600:26) at CompileMetadataResolver.getNgModuleMetadata (eval at (app.bundle.js:1852), :15399:24) at JitCompiler._loadModules (eval at (app.bundle.js:1852), :33760:87) at JitCompiler._compileModuleAndComponents (eval at (app.bundle.js:1852), :33721:36) at JitCompiler.compileModuleAsync (eval at (app.bundle.js:1852), :33637:37) at CompilerImpl.compileModuleAsync (eval at (app.bundle.js:1864), :245:49) at PlatformRef.bootstrapModule (eval at (app.bundle.js:229), :5646:25) at eval (eval at (app.bundle.js:827), :76:53)

app.ts

platformBrowserDynamic().bootstrapModule(AppModule);

app.module.ts

import {NgModule} from '@angular/core';
import {BrowserModule} from '@angular/platform-browser';
import {UpgradeModule} from '@angular/upgrade/static';

@NgModule({
    imports: [
        BrowserModule,
        UpgradeModule
    ]
})
export class AppModule {
    constructor(private upgrade: UpgradeModule) {
    }

    ngDoBootstrap() {
        this.upgrade.bootstrap(document.documentElement, ['myApp']);
    }
}

tsconfig.json

{
  "compileOnSave": false,
  "compilerOptions": {
    "outDir": "./dist/out-tsc",
    "sourceMap": true,
    "declaration": false,
    "module": "commonjs",
    "emitDecoratorMetadata": true,
    "experimentalDecorators": true,
    "target": "es5",
    "typeRoots": [
      "node_modules/@types"
    ],
    "lib": [
      "es2017",
      "dom"
    ]
  }
}

I'm using webpack. Here's part of my config:

resolve: {
    extensions: ['.js', '.ts'],
    alias: {
        "@angular/upgrade/static": "@angular/upgrade/bundles/upgrade-static.umd.js"
    }
},

module: {
    rules: [
        {
            test: /\.ts$/,
            loader: 'ts-loader',
            exclude: '/node_modules'
        },