EC
TS2456
TypeScriptERRORNotableTypeHIGH confidence

Type alias 'X' circularly references itself.

Production Risk

Build will fail; resolve before shipping.

What this means

A type-checking error (TS2456): Type alias 'X' circularly references itself.. This diagnostic is emitted by the TypeScript compiler when type alias 'X' circularly references itself..

Why it happens
  1. 1The type definition is circular or infinitely recursive
How to reproduce

TypeScript compiler reports TS2456 during type checking.

trigger — this will error
trigger — this will error
// Triggers TS2456
// Type alias 'X' circularly references itself.

expected output

error TS2456: Type alias 'X' circularly references itself.

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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