TypeScript version not compatible with Angular 11 after generating client code

Question

I am not able to compile the generated client because the TypeScript version is not compatible with Angular 11:

ERROR: The Angular Compiler requires TypeScript >=4.0.0 and <4.1.0 but 3.5.3 was found instead.

How can I set the correct TypeScript version while I generate the code? This is how I defined the gradle task:

openApiGenerate {
    generatorName = 'typescript-angular'
    inputSpec = swaggerFilePath
    outputDir = apiClientOutputDir
    configOptions = [
            npmName   : 'rest-client',
            npmVersion: '0.0.0',
            ngVersion: '11.0.6'
    ]
}

This is what gets written into the package.json-file of the rest-client module.

  "devDependencies": {
    "@angular/common": "^11.0.6",
    "@angular/compiler": "^11.0.6",
    "@angular/compiler-cli": "^11.0.6",
    "@angular/core": "^11.0.6",
    "@angular/platform-browser": "^11.0.6",
    "ng-packagr": "^5.4.0",
    "reflect-metadata": "^0.1.3",
    "rxjs": "^6.5.0",
    "tsickle": "^0.35.0",
    "typescript": ">=3.4.0 <3.6.0",
    "zone.js": "^0.9.1"
  }

My dependencies:

// Spring Docs
implementation 'org.springdoc:springdoc-openapi-ui:1.5.2'
implementation 'org.springdoc:springdoc-openapi-data-rest:1.5.2'

Answer 1

The problem was that I was using an outdated version of the OpenAPI Generator that didn't know about Angular 11.

Changing

id 'org.openapi.generator' version '4.2.2'

to

id 'org.openapi.generator' version '5.0.0'

resolved the issue.

I also upgraded my Spring Doc dependencies to the latest version at this time:

// Spring Docs
implementation 'org.springdoc:springdoc-openapi-ui:1.5.2'
implementation 'org.springdoc:springdoc-openapi-data-rest:1.5.2'