[Bug]: Type of loader should not allow to return undefined

[jer-sen]

What version of React Router are you using?

6.8.2

Steps to Reproduce

Write a function that return undefined or nothing in a loader of a route.

Expected Behavior

Type Script error.

This type

/**
 * Route loader function signature
 */
export interface LoaderFunction {
    (args: LoaderFunctionArgs): Promise<Response> | Response | Promise<any> | any;
}

should be rewritten

/**
 * Route loader function signature
 */
export interface LoaderFunction {
    (args: LoaderFunctionArgs): Promise<Response> | Response | Promise<string | number | boolean | symbol | object | null> | string | number | boolean | symbol | object | null;
}

Actual Behavior

No TS error, and so there will be an error at runtime.

[timdorr]

We can use NonNullable instead.

[brophdawg11]

Closed in #10267. This will be available when React Router 6.11 is released.

[github-actions]

🤖 Hello there,

We just published version 6.11.0-pre.0 which involves this issue. If you'd like to take it for a test run please try it out and let us know what you think!

Thanks!

[github-actions]

🤖 Hello there,

We just published version 6.11.0 which involves this issue. If you'd like to take it for a test run please try it out and let us know what you think!

Thanks!