Fix discriminator propertyName inference (#1342)

* Fix discriminator propertyName inference * Update docs * Improve tests, fix additional bugs
openapi-ts · Sep 13, 2023 · c17669d · c17669d
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diff --git a/.changeset/friendly-numbers-tease.md b/.changeset/friendly-numbers-tease.md
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+---
+"openapi-typescript": patch
+---
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+Fix discriminator propertyName inference
diff --git a/docs/src/content/docs/advanced.md b/docs/src/content/docs/advanced.md
@@ -488,4 +488,6 @@ Pet: components["schemas"]["Cat"] | components["schemas"]["Dog"] | components["s
 Cat: { type?: "cat"; } & components["schemas"]["PetCommonProperties"];
 ```
 
+_Note: you optionally could provide `discriminator.propertyName: "type"` on `Pet` ([docs](https://spec.openapis.org/oas/v3.1.0#discriminator-object)) to automatically generate the `type` key, but is less explicit._
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 While the schema permits you to use composition in any way you like, it’s good to always take a look at the generated types and see if there’s a simpler way to express your unions & intersections. Limiting the use of `oneOf` is not the only way to do that, but often yields the greatest benefits.
diff --git a/packages/openapi-typescript/examples/github-api-next.ts b/packages/openapi-typescript/examples/github-api-next.ts