Merge pull request #15704 from Automattic/vkarpov15/gh-15699

types: make inferRawDocType correctly infer empty array type `[]` as `any[]`

Author: vkarpov15

test/types/inferrawdoctype.test.ts

@@ -127,3 +127,10 @@ function HandlesAny() {
   type ActualNested = InferRawDocType<Record<string, any>>;
   expectType<{ [x: string]: any }>({} as ActualNested);
 }
+
+function gh15699() {
+  const schema = { unTypedArray: [] } as const;
+
+  type TSchema = InferRawDocType<typeof schema>;
+  expectType<any[] | null | undefined>({} as unknown as TSchema['unTypedArray']);
+}

types/inferrawdoctype.d.ts

@@ -60,7 +60,7 @@ declare module 'mongoose' {
     [PathValueType] extends [neverOrAny] ? PathValueType
     : PathValueType extends Schema ? InferSchemaType<PathValueType>
     : PathValueType extends ReadonlyArray<infer Item> ?
-      Item extends never ? any[]
+      [Item] extends [never] ? any[]
       : Item extends Schema ?
         // If Item is a schema, infer its type.
         Array<InferSchemaType<Item>>