Comments (2)
TS doesn't have any type-level representation of "The truthy values of T
" or "All truthy values", so at any point where we have to write down the type, the next-best thing is NonNullable<T>
which is a sound but not-complete superset (it includes ''
when it shouldn't) of that.
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But it seems like it wouldn't be that troublesome to define types which extracts or excludes falsy types from a union, much like NonNullable excludes null and undefined and use those in such cases. And if T includes number, both branches would have to include number because there's no NaN type, but I think you get that part done with Extract and Exclude.
Of course I don't know what all would be involved in the change, so maybe it's a difficult ask.
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Related Issues (20)
- [NewErrors] 5.5.0-dev.20240428 vs 5.4.5 HOT 49
- Private class properties prevent `Readonly` type inference HOT 2
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- [ServerErrors][JavaScript] 5.5.0-dev.20240428 HOT 9
- Strange runtime caching bug involving `as const` and `const T` generic HOT 1
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- JSDoc @import not detecting use in @callback HOT 2
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- Constraint in generic type forgotten in assignability check
- tsc crash with "TypeError: Cannot read properties of undefined (reading 'flags')" HOT 5
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- Unnecessary any returned from Object.values and Object.entries HOT 10
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from typescript.