EC
TS90028
TypeScriptERRORNotableConfigHIGH confidence

Call decorator expression

Production Risk

Build will fail; resolve before shipping.

What this means

A TypeScript diagnostic (TS90028): Call decorator expression. This diagnostic is emitted by the TypeScript compiler when call decorator expression.

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 TS90028 during type checking.

trigger — this will error
trigger — this will error
// Triggers TS90028
// Call decorator expression

expected output

error TS90028: Call decorator expression

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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