[BUG] [typescript-angular] dependency conflict in generated package.json for angular v20

[jschlicker]

Bug Report Checklist

• Have you provided a full/minimal spec to reproduce the issue?
• Have you validated the input using an OpenAPI validator?
• Have you tested with the latest master to confirm the issue still exists?
• Have you searched for related issues/PRs?
• What's the actual output vs expected output?
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Description

The typescript-angular generator does not generate a package.json with compatible dependencies. There are dependency conflicts. The following output is written:

npm error Found: @angular/compiler-cli@20.1.4
npm error node_modules/@angular/compiler-cli
npm error   dev @angular/compiler-cli@"^20.0.0" from the root project
npm error
npm error Could not resolve dependency:
npm error peer @angular/compiler-cli@"^19.0.0 || ^19.1.0-next.0 || ^19.2.0-next.0" from ng-packagr@19.2.2
npm error node_modules/ng-packagr
npm error   dev ng-packagr@"^19.0.0" from the root project
npm error
npm error Fix the upstream dependency conflict, or retry
npm error this command with --force or --legacy-peer-deps
npm error to accept an incorrect (and potentially broken) dependency resolution.
npm error
npm error
npm error For a full report see:
npm error /home/runner/.npm/_logs/2025-08-04T11_57_47_528Z-eresolve-report.txt
npm error A complete log of this run can be found in: /home/runner/.npm/_logs/2025-08-04T11_57_47_528Z-debug-0.log

openapi-generator version

I have tested it with the following versions: 7.14.0, 7.13.0

Generation Details

This is how my openapitools.json file looks like:

{
   "$schema": "../../node_modules/@openapitools/openapi-generator-cli/config.schema.json",
   "spaces": 3,
   "generator-cli": {
      "version": "7.14.0",
      "generators": {
         "typescript-angular": {
            "generatorName": "typescript-angular",
            "glob": "./generated/swagger.json",
            "output": "./generated/typescript-angular/",
            "additionalProperties": {
               "enumPropertyNaming": "UPPERCASE",
               "fileNaming": "kebab-case",
               "stringEnums": true,
               "supportsES6": true,
               "ngVersion": "19.0.0",
               "useSingleRequestParameter": true
            }
         }
      }
   }
}

[LorinRenodeyn2PO]

Angular v20 is not yet supported. According to this pr #21563 support for angular v20 should come in the next generator release.

This is expected if the angular version you're using in your root project and the one used by the generated client differ.
Until then you can add an overrides block to your package json to fix this.

[jschlicker]

Hello @LorinRenodeyn2PO,

i am sorry for raising an issue about this. It appears that I overlooked it despite searching and filtering. Thank you for your prompt response.