EC
TS6222
TypeScriptERRORNotableConfigHIGH confidence

Emit class fields with Define instead of Set.

Production Risk

Build will fail; resolve before shipping.

What this means

A compiler configuration error (TS6222): Emit class fields with Define instead of Set.. This diagnostic is emitted by the TypeScript compiler when emit class fields with Define instead of Set..

Why it happens
  1. 1Incorrect TypeScript syntax or type usage
  2. 2Type mismatch between declared and actual value
How to reproduce

TypeScript compiler reports TS6222 during type checking.

trigger — this will error
trigger — this will error
// Triggers TS6222
// Emit class fields with Define instead of Set.

expected output

error TS6222: Emit class fields with Define instead of Set.

Fix

Fix the tsconfig.json option

WHEN When a compiler option is invalid or missing

Fix the tsconfig.json option
// tsconfig.json
{
  "compilerOptions": {
    // Review and correct the flagged option
  }
}
// Run: npx tsc --showConfig to see effective config

Why this works

TypeScript validates tsconfig.json options; check the official tsconfig reference for valid values.

Sources
Official documentation ↗

TypeScript Compiler Diagnostics

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