fix(schema-object): transform toplevel schema object (#1622)

* fix(schema-object): transform toplevel schemas

fix

* fix: changeset

Author: ehrenschwan-gh

.changeset/smooth-cameras-fail.md

@@ -0,0 +1,5 @@
+---
+"openapi-typescript": patch
+---
+
+Transform toplevel schemas

packages/openapi-typescript/src/transform/schema-object.ts

@@ -236,6 +236,21 @@ export function transformSchemaObjectWithComposition(
  */
 function transformSchemaObjectCore(schemaObject: SchemaObject, options: TransformNodeOptions): ts.TypeNode | undefined {
   if ("type" in schemaObject && schemaObject.type) {
+    if (typeof options.ctx.transform === "function") {
+      const result = options.ctx.transform(schemaObject, options);
+      if (result) {
+        if ("schema" in result) {
+          if (result.questionToken) {
+            return ts.factory.createUnionTypeNode([result.schema, UNDEFINED]);
+          } else {
+            return result.schema;
+          }
+        } else {
+          return result;
+        }
+      }
+    }
+
     // primitives
     // type: null
     if (schemaObject.type === "null") {

packages/openapi-typescript/test/transform/request-body-object.test.ts

@@ -53,6 +53,37 @@ describe("transformRequestBodyObject", () => {
         // options: DEFAULT_OPTIONS,
       },
     ],
+    [
+      "blob with transform",
+      {
+        given: {
+          content: {
+            "application/json": {
+              schema: {
+                type: "string",
+                format: "binary",
+              },
+            },
+          },
+        },
+        want: `{
+    content: {
+        "application/json": Blob;
+    };
+}`,
+        options: {
+          ...DEFAULT_OPTIONS,
+          ctx: {
+            ...DEFAULT_CTX,
+            transform(schemaObject) {
+              if (schemaObject.format === "binary") {
+                return BLOB;
+              }
+            },
+          },
+        },
+      },
+    ],
     [
       "optional blob property with transform",
       {