ts-r
  • Error
  • Reported by the type checker

TS1206

Decorators are not valid here.

A decorator is placed on something that cannot be decorated, such as a function declaration or a variable statement.

What it means

Decorators apply to classes and class members (and, with experimentalDecorators, parameters of class methods and constructors). On other declarations, such as plain functions, variable statements or constructors, they're reported here.

Example

index.ts
function log(target: unknown) {}
@log
function run() {}
export {};
ts-r-check -p tsconfig.json --pretty false ts-r output
index.ts(2,1): error TS1206: Decorators are not valid here.

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

  • Call the function yourself instead: const run = log(function run() {}), or wrap it in a class.
  • Move the decorator to a class or class member.