Flattened types

Especially for beginners, it can be quite hard to understand the types of react-admin due to its highly reusable type structure.

For example in the DataProvider type definition we have for the getList method:
getList: <RecordType extends RaRecord = any>(resource: ResourceType, params: GetListParams & QueryFunctionContext) => Promise<GetListResult<RecordType>>

However, it would be much more helpful to resolve the types directly. Like GetListParams & QueryFunctionContext could be resolved via some VS Code extension (https://marketplace.visualstudio.com/items?itemName=MylesMurphy.prettify-ts):

However, it's IDE-dependent and beginners probably do not know this.

What about using something like simplify from type-fest so it's directly in the codebase?
https://github.com/sindresorhus/type-fest/blob/main/source/simplify.d.ts

Has this ever been considered?

Start with the DataProvider type definition and its getList signature, then review the linked type-fest Simplify definition and the VS Code extension example. Determine whether flattened types should be adopted and which type declarations are in scope; done requires an agreed implementation direction and validation of the resulting developer experience.