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[BUGFIX LTS] Fix runloop types on TS 5.0+ #20400

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@chriskrycho chriskrycho commented Mar 4, 2023

TS 5.0 catches a new set of assignability errors here, and our (very) complicated set of types for bind and friends got flagged by that. The terminal case for PartialParams needs to be a fixed empty tuple rather than never, so that the type system can see that it will be resolved as 'no arguments' rather than 'nothing' in that scenario.

Note: this fixes the one bug on our side. There is also a bug fix in the latest TS nightly (typescript@next) build, which combined with this PR should get us unblocked against TS nightlies again. We're in good shape for TS 5.0 and the upcoming 5.1 as a result!

Note: I have marked this as BUGFIX LTS because it affects our build. End users will not be affected by these changes until we have types publishing from source for this (presumably in 5.1 or 5.2), but any fixes we do make to 4.8 or 4.12 will see this in their CI runs, so we need to back-port it.

TS 5.0 catches a new set of assignability errors here, and our (very)
complicated set of types for `bind` and friends got flagged by that.
The terminal case for `PartialParams` needs to be a fixed empty tuple
rather than `never`, so that the type system can see that it will be
resolved as 'no arguments' rather than 'nothing' in that scenario.
@chriskrycho chriskrycho added Bug TypeScript Work on Ember’s types labels Mar 4, 2023
@chriskrycho chriskrycho changed the title [BUGFIX LTS] Fix runloop types on TS 5.0+ [BUGFIX beta] Fix runloop types on TS 5.0+ Mar 4, 2023
@chriskrycho chriskrycho changed the title [BUGFIX beta] Fix runloop types on TS 5.0+ [BUGFIX LTS] Fix runloop types on TS 5.0+ Mar 4, 2023
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Duplicate of #20398. 🎉

@chriskrycho chriskrycho closed this Mar 4, 2023
@chriskrycho chriskrycho deleted the fix-ts-next branch March 4, 2023 17:26
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