fix: allow optional types for remote query/command/prerender functions#15293
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fix: allow optional types for remote query/command/prerender functions#15293
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We're using the `arg: undefined extends Input ? Input | void : Input` method and not the `...args: undefined extends Input ? [arg?: Input] : [arg: Input]` method because the former does work in more cases (the latter throws a type error in our own code around generics), even though the TS team likely wants us to use the latter (but that pattern is in so many code bases now that this behavior around `void` will never change). One drawback (of either method) is that without strict mode all commands/queries/prerenders have optional args now, because `undefined extends X` is always `true` in non-strict mode. But since noone who uses type checking nowadays should use non-strict mode anyway, it's fine. fixes #14500
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sveltejs#15293) We're using the `arg: undefined extends Input ? Input | void : Input` method and not the `...args: undefined extends Input ? [arg?: Input] : [arg: Input]` method because the former does work in more cases (the latter throws a type error in our own code around generics), even though the TS team likely wants us to use the latter (but that pattern is in so many code bases now that this behavior around `void` will never change). One drawback (of either method) is that without strict mode all commands/queries/prerenders have optional args now, because `undefined extends X` is always `true` in non-strict mode. But since noone who uses type checking nowadays should use non-strict mode anyway, it's fine. fixes sveltejs#14500 --- ### Please don't delete this checklist! Before submitting the PR, please make sure you do the following: - [x] It's really useful if your PR references an issue where it is discussed ahead of time. In many cases, features are absent for a reason. For large changes, please create an RFC: https://github.com/sveltejs/rfcs - [x] This message body should clearly illustrate what problems it solves. - [x] Ideally, include a test that fails without this PR but passes with it. ### Tests - [x] Run the tests with `pnpm test` and lint the project with `pnpm lint` and `pnpm check` ### Changesets - [x] If your PR makes a change that should be noted in one or more packages' changelogs, generate a changeset by running `pnpm changeset` and following the prompts. Changesets that add features should be `minor` and those that fix bugs should be `patch`. Please prefix changeset messages with `feat:`, `fix:`, or `chore:`. Co-authored-by: Tee Ming <chewteeming01@gmail.com>
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We're using the
arg: undefined extends Input ? Input | void : Inputmethod and not the...args: undefined extends Input ? [arg?: Input] : [arg: Input]method because the former does work in more cases (the latter throws a type error in our own code around generics), even though the TS team likely wants us to use the latter (but that pattern is in so many code bases now that this behavior aroundvoidwill never change).One drawback (of either method) is that without strict mode all commands/queries/prerenders have optional args now, because
undefined extends Xis alwaystruein non-strict mode. But since noone who uses type checking nowadays should use non-strict mode anyway, it's fine.fixes #14500
Please don't delete this checklist! Before submitting the PR, please make sure you do the following:
Tests
pnpm testand lint the project withpnpm lintandpnpm checkChangesets
pnpm changesetand following the prompts. Changesets that add features should beminorand those that fix bugs should bepatch. Please prefix changeset messages withfeat:,fix:, orchore:.