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New posts in union-types
Can Typescript guard / discriminate based on field presence (undefined / absent) rather than value?
Feb 20, 2026
typescript
undefined
discriminated-union
union-types
type-narrowing
How to narrow a list of unions?
Feb 08, 2026
python
mypy
python-typing
union-types
narrowing
Confused about type declarations in Julia
Feb 04, 2026
performance
struct
types
julia
union-types
Destructure/access a property that may or may not exist on an object union type
Jan 28, 2026
typescript
destructuring
union-types
object-destructuring
Conflicting types in some constituents
Jan 03, 2026
typescript
union-types
Elm union subsets
Dec 31, 2025
elm
union-types
Elm: How to Json decode a Union Type with a single TypeConstructor?
Dec 07, 2025
json
decode
elm
type-constructor
union-types
How to express union types in Kotlin?
Dec 06, 2025
kotlin
union-types
sum-type
In Haskell, if Maybe is a Type or an Union Type, how do you call `Nothing`?
Dec 03, 2025
haskell
union-types
Typescript: Optional Parameter in function, depending on Union Type has property
Nov 24, 2025
typescript
union-types
Type for const string array containing subset of string literal union type
Nov 24, 2025
typescript
union-types
How to define a true logical OR of object types (no mixing of different object keys in result) [duplicate]
Nov 07, 2025
typescript
union-types
How to check what types are in defined types.UnionType? [duplicate]
Oct 30, 2025
python
python-typing
union-types
python-3.11
How to handle parameters of union functions correctly when they are tied to another parameter?
Oct 29, 2025
typescript
union-types
TypeScript array of union vs union of array
Oct 28, 2025
typescript
union-types
How to constrain generic to a union?
Oct 22, 2025
typescript
typescript-generics
union-types
Issue with union types and conditional types
Oct 19, 2025
typescript
generics
typescript-generics
union-types
conditional-types
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