EC
TS95195
TypeScriptERRORNotableConfigHIGH confidence

Wrap all invalid decorator expressions in parentheses

Production Risk

Build will fail; resolve before shipping.

What this means

A TypeScript diagnostic (TS95195): Wrap all invalid decorator expressions in parentheses. This diagnostic is emitted by the TypeScript compiler when wrap all invalid decorator expressions in parentheses.

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 TS95195 during type checking.

trigger — this will error
trigger — this will error
// Triggers TS95195
// Wrap all invalid decorator expressions in parentheses

expected output

error TS95195: Wrap all invalid decorator expressions in parentheses

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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