TS2693

Type used as a runtime value

'User' only refers to a type, but is being used as a value here.

The compiler’s own words. Not translated — this is the string you pasted into a search box.

A type alias was referenced in value space, but aliases are erased from the emitted JavaScript.

Reproduction

type User = { id: string }

const Ctor = User

The build asserts this emits exactly this code.

Why the compiler says this

TypeScript has parallel type and value namespaces. `type` and `interface` declarations exist only while checking; code that runs needs a class, function, object, or another real JavaScript value.

Fixes

type User = { id: string }

const user: User = { id: 'u1' }

Use the alias in a type position and provide a real value separately.

class User {
  constructor(readonly id: string) {}
}

const user = new User('u1')

Use a class when one name must describe both instances and a runtime constructor.

Takeaway

Ask whether the current position survives into JavaScript. If it does, a type-only declaration cannot fill it.

Where to go next

Type aliases Try it in the Lab

Errors