EC
TS1436
TypeScriptERRORNotableSyntaxHIGH confidence

Decorators must precede the name and all keywords of property declarations.

Production Risk

Build will fail; resolve before shipping.

What this means

A syntax error (TS1436): Decorators must precede the name and all keywords of property declarations.. This diagnostic is emitted by the TypeScript compiler when decorators must precede the name and all keywords of property declarations..

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 TS1436 during type checking.

trigger — this will error
trigger — this will error
// Triggers TS1436
// Decorators must precede the name and all keywords of property declarations.

expected output

error TS1436: Decorators must precede the name and all keywords of property declarations.

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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