fix(openapi-typescript): enumValues generates valid TypeScript for oneOf/anyOf unions

[darkbasic]

Changes

When using enumValues: true with OpenAPI schemas containing oneOf/anyOf unions, the generated TypeScript type paths would fail because properties might only exist on some union variants.

Before (invalid TypeScript):

export const resourceItemsNestedCodeValues: ReadonlyArray<
  FlattenedDeepRequired<components>["schemas"]["Resource"]["items"]["nested"]["code"]
> = ["a", "b"];
// Error: Property 'nested' does not exist on type '{ type: "simple"; } | { type: "complex"; nested: { code: "a" | "b"; }; }'

After (valid TypeScript):

export const resourceItemsOneOf1NestedCodeValues: ReadonlyArray<
  Extract<Extract<FlattenedDeepRequired<components>["schemas"]["Resource"]["items"], {
    nested: unknown;
  }>["nested"], {
    code: unknown;
  }>["code"]
> = ["a", "b"];

The fix wraps property accesses after oneOf/anyOf indices with Extract<> to narrow the union type before accessing variant-specific properties.

This PR has been tested in a production environment with a custom build of openapi-typescript.

How to Review

I've added three tests:

• Basic union variant narrowing
• Same property name with different inner schemas
• Deeply nested unions (multiple Extract levels)

Checklist

• Unit tests updated
• [] docs/ updated (if necessary)
• [] pnpm run update:examples run (only applicable for openapi-typescript)

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[darkbasic]

Note: two tests will fail due to network errors (probably the original gist has been deleted). Nothing I can do on that front (they were already failing on main).