closes astahmer#85. Adds support for extended types with allOf. (astahmer#86)

nice job 🙌

Author: massfords

.changeset/plain-dolls-give.md

@@ -0,0 +1,5 @@
+---
+"typed-openapi": patch
+---
+
+closes #85. Adds support for extended types with allOf.

packages/typed-openapi/src/openapi-schema-to-ts.ts

@@ -52,11 +52,11 @@ export const openApiSchemaToTs = ({ schema, meta: _inheritedMeta, ctx }: Openapi
     }
 
     if (schema.allOf) {
-      if (schema.allOf.length === 1) {
-        return openApiSchemaToTs({ schema: schema.allOf[0]!, ctx, meta });
-      }
-
       const types = schema.allOf.map((prop) => openApiSchemaToTs({ schema: prop, ctx, meta }));
+      const {allOf, externalDocs,  example, examples, description, title,  ...rest} = schema
+      if (Object.keys(rest).length > 0) {
+        types.push(openApiSchemaToTs({schema: rest, ctx, meta}))
+      }
       return t.intersection(types);
     }
 

packages/typed-openapi/tests/openapi-schema-to-ts.test.ts

@@ -1,4 +1,3 @@
-
 import type { SchemasObject } from "openapi3-ts/oas31";
 import { describe, expect, test } from "vitest";
 
@@ -450,6 +449,36 @@ describe("getSchemaBox with context", () => {
     );
   });
 
+  test("with ref and allOf", () => {
+    const schemas = {
+      Extends: {
+        allOf: [{$ref: "#/components/schemas/Base"}],
+        type: "object",
+        properties: {
+          str: { type: "string" },
+          nb: { type: "number" },
+        },
+        required: ["str"],
+      },
+      Base: {
+        type: "object",
+        properties: {
+          baseProp: { type: "string" },
+        }
+      },
+    } satisfies SchemasObject;
+
+    const ctx = makeCtx(schemas);
+    expect(openApiSchemaToTs({ schema: schemas["Extends"]!, ctx })).toMatchInlineSnapshot(
+      `
+      {
+        "type": "intersection",
+        "value": "(Base & { str: string, nb?: number | undefined })",
+      }
+    `,
+    );
+  });
+
   test("with multiple nested refs", () => {
     const schemas = {
       Root2: {