ts-r
  • Error
  • Reported by the type checker

TS2749

'{0}' refers to a value, but is being used as a type here. Did you mean 'typeof {0}'?

A variable or function is used in a type position. Use typeof name to get its type, or reference the actual type.

What it means

Values and types live in separate namespaces. A name that is only a value (a variable, a function, a constant) can't be used as a type directly.

Example

index.ts
const defaults = { port: 80 };
let config: defaults;
export {};
ts-r-check -p tsconfig.json --pretty false ts-r output
index.ts(2,13): error TS2749: 'defaults' refers to a value, but is being used as a type here. Did you mean 'typeof defaults'?

Recorded by node scripts/verify-examples.mjs with ts-r built from commit 6deaf01. The example uses the default tsconfig: strict, target: es2022, module: esnext, moduleResolution: bundler.

How to fix

  • Use typeof to get the value's type: let config: typeof defaults;.
  • Or declare a named type or interface and use that.