TS2749

Value used as a type

'widget' refers to a value, but is being used as a type here. Did you mean 'typeof widget'?

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

A runtime variable was written in type space; use `typeof` to ask for the type of that value.

Reproduction

const widget = { id: 1 }

type Copy = widget

The build asserts this emits exactly this code.

Why the compiler says this

Names do not automatically cross from value space into type space. The type-query form of `typeof` is the explicit bridge: it asks the checker to capture the static type of an existing value without running JavaScript’s `typeof` operator.

Fixes

01
```
const widget = { id: 1 }

type Copy = typeof widget
```
Use a type query when the value should be the source of truth.

type Widget = { id: number }

const widget: Widget = { id: 1 }

Declare the type first when the contract should govern several values.

Takeaway

Use `typeof value` in a type position; bare value names remain runtime expressions.

Where to go next

Type aliases Try it in the Lab

Errors