Invalid loader type of `void` when loader function has `promise.then(data => data.x)` about router

[TkDodo]

Not sure why but the issue goes away when removing async from this function (that doesn't have await in it anyway):
https://www.typescriptlang.org/play?#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

I generally wouldn't mix async/await with promise chaining - choose one and stick with it :)

[toteto]

That solves it for now, but probably more devs will face this inconsistency. await Promise.resolve('foo') should be the same type as await Promise.resolve().then(() => 'foo), both should be Promise<string>.

Additional hint, was using previously version 1.17.4 and this behaviour was OK. The regression was done between this and 1.26.3