Cannot find name 'Nullable'

[streusselhirni]

API Platform version(s) affected: 0.8.2

Description
When using api-doc-parser in a Project set up with VueCLI with Typescript, I get the compile error Cannot find name 'Nullable' in the following files:

• Api.d.ts
• Field.d.ts
• Operation.d.ts
• Resource.d.ts

How to reproduce

1. Create Project with VueCLI using this Preset

{
  "useTaobaoRegistry": false,
  "packageManager": "yarn",
  "latestVersion": "4.3.1",
  "lastChecked": 1586624138305,
  "presets": {
    "api-doc-parser-preset": {
      "useConfigFiles": true,
      "plugins": {
        "@vue/cli-plugin-babel": {},
        "@vue/cli-plugin-typescript": {
          "classComponent": true,
          "useTsWithBabel": true
        },
        "@vue/cli-plugin-eslint": {
          "config": "airbnb",
          "lintOn": [
            "save"
          ]
        }
      }
    }
  }
}

2. Add api-doc-parser to dependencies with yarn add @api-platform/api-doc-parser (or npm install @api-platform/api-doc-parser

3. Add the following code to the generated App.vue file between the <script lang="ts"></script> tags:

import { Component, Vue } from 'vue-property-decorator';
import HelloWorld from './components/HelloWorld.vue';
import parseHydraDocumentation
  from '@api-platform/api-doc-parser/lib/hydra/parseHydraDocumentation';

@Component({
  components: {
    HelloWorld,
  },
})
export default class App extends Vue {
  async mounted() {
    const docs = parseHydraDocumentation('http://localhost:8000/api');
    console.log(docs);
  }

4. Run yarn serve (or npm run serve)

5. The errors show up in the console:

Possible Solution
I managed to work around this issue by creating a global.d.ts file, making sure it is used by deleting the types key in tsconfig.json and adding the following code in global.d.ts:

type Nullable<T>  = {
  [P in keyof T]: T[P] | null
}