EC
TS2744
TypeScriptERRORNotableTypeHIGH confidence

Type parameter defaults can only reference previously declared type parameters.

Production Risk

Build will fail; resolve before shipping.

What this means

A type-checking error (TS2744): Type parameter defaults can only reference previously declared type parameters.. This diagnostic is emitted by the TypeScript compiler when type parameter defaults can only reference previously declared type parameters..

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

TypeScript compiler reports TS2744 during type checking.

trigger — this will error
trigger — this will error
// Triggers TS2744
// Type parameter defaults can only reference previously declared type parameters.

expected output

error TS2744: Type parameter defaults can only reference previously declared type parameters.

Fix

Address the TypeScript diagnostic

WHEN When this error is reported by the compiler

Address the TypeScript diagnostic
// Run the TypeScript compiler for details:
npx tsc --noEmit
// Use the TypeScript playground to test your code:
// https://www.typescriptlang.org/play

Why this works

Review the full error message and location; the TypeScript handbook provides guidance on each error category.

Sources
Official documentation ↗

TypeScript Compiler Diagnostics

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