EC
TS6205
TypeScriptERRORNotableConfigHIGH confidence

All type parameters are unused.

Production Risk

Build will fail; resolve before shipping.

What this means

A compiler configuration error (TS6205): All type parameters are unused.. This diagnostic is emitted by the TypeScript compiler when all type parameters are unused..

Why it happens
  1. 1Incorrect number or type of generic type arguments
How to reproduce

TypeScript compiler reports TS6205 during type checking.

trigger — this will error
trigger — this will error
// Triggers TS6205
// All type parameters are unused.

expected output

error TS6205: All type parameters are unused.

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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