EC
TS2862
TypeScriptERRORNotableTypeHIGH confidence

Type 'X' is generic and can only be indexed for reading.

Production Risk

Build will fail; resolve before shipping.

What this means

A type-checking error (TS2862): Type 'X' is generic and can only be indexed for reading.. This diagnostic is emitted by the TypeScript compiler when type 'X' is generic and can only be indexed for reading..

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

TypeScript compiler reports TS2862 during type checking.

trigger — this will error
trigger — this will error
// Triggers TS2862
// Type 'X' is generic and can only be indexed for reading.

expected output

error TS2862: Type 'X' is generic and can only be indexed for reading.

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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