EC
TS1206
TypeScriptERRORNotableSyntaxHIGH confidence

Decorators are not valid here.

Production Risk

Build will fail; resolve before shipping.

What this means

A syntax error (TS1206): Decorators are not valid here.. This diagnostic is emitted by the TypeScript compiler when decorators are not valid here..

Why it happens
  1. 1A decorator is applied incorrectly or to an unsupported target
  2. 2The 'experimentalDecorators' flag may need to be enabled
How to reproduce

TypeScript compiler reports TS1206 during type checking.

trigger — this will error
trigger — this will error
// Triggers TS1206
// Decorators are not valid here.

expected output

error TS1206: Decorators are not valid here.

Fix

Enable experimentalDecorators

WHEN Using legacy decorator syntax

Enable experimentalDecorators
// tsconfig.json
{
  "compilerOptions": {
    "experimentalDecorators": true,
    "emitDecoratorMetadata": true
  }
}

Why this works

Decorators require the 'experimentalDecorators' flag; TypeScript 5.0+ also supports the TC39 Stage 3 decorator proposal without the flag.

Sources
Official documentation ↗

TypeScript Compiler Diagnostics

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