Is your feature request related to a problem? Please describe.

As already discussed in issue #10514, anyOf, allOf, and oneOf schema features are unsupported in most client generators. Our team needs support for the oneOf feature in the Javascript generator.

Describe the solution you'd like

Client side input and output checks on models that include oneOf in their definitions.

Describe alternatives you've considered

Not using oneOf for validation.

Additional context

Following in the footsteps of #10812, offering $1000 (USD) and gratitude to anyone who resolves this.