fixup!

* Simplify minItems / maxItems tuple generation

Closes #2048

Author: duncanbeevers

.changeset/clean-phones-deliver.md

@@ -0,0 +1,10 @@
+---
+"openapi-typescript": minor
+---
+
+Extract types generation for Array-type schemas to `transformArraySchemaObject` method.
+Generate correct number of union members for `minItems` * `maxItems` unions.
+Generate readonly tuple members for `minItems` & `maxItems` unions.
+Generate readonly spread member for `prefixItems` tuple.
+Preserve `prefixItems` type members in `minItems` & `maxItems` tuples.
+Generate spread member for `prefixItems` tuple with no `minItems` / `maxItems` constraints.

packages/openapi-typescript/src/lib/utils.ts

@@ -250,7 +250,7 @@ export function scanDiscriminators(schema: OpenAPI3, options: OpenAPITSOptions)
       return;
     }
 
-    const oneOf: (SchemaObject | ReferenceObject)[] = obj.oneOf;
+    const oneOf = obj.oneOf as readonly (SchemaObject | ReferenceObject)[];
     const mapping: InternalDiscriminatorMapping = {};
 
     // the mapping can be inferred from the oneOf refs next to the discriminator object

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

@@ -286,9 +286,7 @@ function isArraySchemaObject(schemaObject: SchemaObject | ArraySchemaObject): sc
  * @param itemType The type to pad out the end of the array with
  */
 function padTupleMembers(prefixTypes: readonly ts.TypeNode[], length: number, itemType: ts.TypeNode) {
-  return Array.from({ length }).map((_, index) =>
-    index < prefixTypes.length ? prefixTypes[index] : itemType
-  );
+  return Array.from({ length }).map((_, index) => (index < prefixTypes.length ? prefixTypes[index] : itemType));
 }
 
 function toOptionsReadonly<TMembers extends ts.ArrayTypeNode | ts.TupleTypeNode>(

packages/openapi-typescript/test/transform/schema-object/array.test.ts

@@ -46,12 +46,12 @@ describe("transformSchemaObject > array", () => {
         given: {
           type: "array",
           items: { type: "number" },
-          prefixItems: [{ type: "number" }, { type: "number" }, { type: "number" }],
+          prefixItems: [{ type: "string" }, { type: "boolean" }, { type: "string" }],
         },
         want: `[
-    number,
-    number,
-    number,
+    string,
+    boolean,
+    string,
     ...number[]
 ]`,
       },