The _id field of the Document type should be of type any, rather exclusively ObjectId when using the driver with TypeScript. In MongoDB, the _id field is required in all documents but can be of many types (ObjectId, string, int, etc.). In TypeScript driver, compiler errors will arise when inserting documents with the _id field set to non-ObjectId types. This then requires odd workarounds, explicitly setting things to the any type.
NODE-3825 Description