EC
TS6630
TypeScriptERRORNotableConfigHIGH confidence

Enable experimental support for legacy experimental decorators.

Production Risk

Build will fail; resolve before shipping.

What this means

A compiler configuration error (TS6630): Enable experimental support for legacy experimental decorators.. This diagnostic is emitted by the TypeScript compiler when enable experimental support for legacy experimental 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 TS6630 during type checking.

trigger — this will error
trigger — this will error
// Triggers TS6630
// Enable experimental support for legacy experimental decorators.

expected output

error TS6630: Enable experimental support for legacy experimental 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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