Track thenable state in work loop #25538
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Same as facebook#25537 but for Flight. I was going to wait to do this later because the temporary implementation of async components uses some of the same code that non-used wakables do, but it's not so bad. I just had to inline one bit of code, which we'll remove when we unify the implementation with `use`.
This is a refactor to track the array of thenables that is preserved across replays in the work loop instead of the Thenable module. The reason is that I'm about to add additional state to the Thenable module that is specific to a particular attempt — like the current index — and is reset between replays. So it's helpful to keep the two kinds of state separate so it's clearer which state gets reset when. The array of thenables is not reset until the work-in-progress either completes or unwinds. This also makes the structure more similar to Fizz and Flight.
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Based on #25541
This is a refactor to track the array of thenables that is preserved across replays in the work loop instead of the Thenable module.
The reason is that I'm about to add additional state to the Thenable module that is specific to a particular attempt — like the current index — and is reset between replays. So it's helpful to keep the two kinds of state separate so it's clearer which state gets reset when.
The array of thenables is not reset until the work-in-progress either completes or unwinds.
This also makes the structure more similar to Fizz and Flight.