TS2315
Type is not generic
Type 'Label' is not generic.The compiler’s own words. Not translated — this is the string you pasted into a search box.
Type arguments were supplied to an alias that declares no type parameters.
Reproduction
type Label = string type Bad = Label<number>
The build asserts this emits exactly this code.
Why the compiler says this
Angle brackets instantiate a generic declaration. A fixed alias such as `Label = string` has nothing to substitute, so `Label<number>` is no more meaningful than passing an argument to a constant.
Fixes
- 01
type Label = string type NameLabel = Label
Remove the type argument when the alias is intentionally fixed.
- 02
type Label<T> = { value: T } type NumberLabel = Label<number>
Declare a parameter when the alias is meant to vary with its input.
Takeaway
The declaration decides whether a type is generic; use-site angle brackets cannot make it so.