Make NodePath<T | U> distributive - #16439
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nicolo-ribaudo merged 1 commit intoApr 21, 2024
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| declare parent: t.ParentMaps[T["type"]]; | ||
| declare parent: t.Node; |
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Does parent path type narrowing still work in this PR?
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Yes, because it's properly defined further down in the NodePath interface.
liuxingbaoyu
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Amazing!
I've tried something similar before and failed. :)
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Fixes #1, Fixes #2This pull request makes it so that the types
NodePath<t.Identifier | t.StringLiteral>andNodePath<t.Identifier> | NodePath<t.StringLiteral>are equivalent. This makes ourpath.is*able to better perform type narrowing:It also makes #16430 slightly faster, because it reduces the number of possible
NodePath<...>types (becauseNodePath<t.Identifier> | NodePath<t.StringLiteral>andNodePath<t.Identifier | t.StringLiteral>are now the same type).Unfortunately it makes it more common for
.ensureBlock()to not work, sinceassertsreturn types do not work on unions (microsoft/TypeScript#44212). I consider this acceptable, sincepath.is*are much more common.