EC
TS6066
TypeScriptERRORNotableConfigHIGH confidence

Enables experimental support for emitting type metadata for decorators.

Production Risk

Build will fail; resolve before shipping.

What this means

A compiler configuration error (TS6066): Enables experimental support for emitting type metadata for decorators.. This diagnostic is emitted by the TypeScript compiler when enables experimental support for emitting type metadata for decorators..

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 TS6066 during type checking.

trigger — this will error
trigger — this will error
// Triggers TS6066
// Enables experimental support for emitting type metadata for decorators.

expected output

error TS6066: Enables experimental support for emitting type metadata for decorators.

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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