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[BUG] [typescript-fetch] uniqueItems in query params does not work

Created by: Nikos410

Bug Report Checklist

  • Have you provided a full/minimal spec to reproduce the issue?
  • Have you validated the input using an OpenAPI validator (example)?
  • 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?
  • [Optional] Sponsorship to speed up the bug fix or feature request (example)
Description

If uniqueItems is true for an array, the typescript-fetch generator uses a Set instead of an array. This does not work for query parameters however, because the querystring function does not support Sets:

https://github.com/OpenAPITools/openapi-generator/blob/8d4c9e24726698b9532e638f7c1dc9d7059230c3/modules/openapi-generator/src/main/resources/typescript-fetch/runtime.mustache#L256-L276)

openapi-generator version

master