EC
TS2879
TypeScriptERRORNotableTypeHIGH confidence

Using JSX fragments requires fragment factory 'X' to be in scope, but it coul...

Production Risk

Build will fail; resolve before shipping.

What this means

A type-checking error (TS2879): Using JSX fragments requires fragment factory 'X' to be in scope, but it could not be found.. This diagnostic is emitted by the TypeScript compiler when using JSX fragments requires fragment factory 'X' to be in scope, but it could not be found..

Why it happens
  1. 1JSX syntax used without enabling '--jsx' compiler option
  2. 2Missing React or JSX runtime import
How to reproduce

TypeScript compiler reports TS2879 during type checking.

trigger — this will error
trigger — this will error
// Triggers TS2879
// Using JSX fragments requires fragment factory 'X' to be in scope, but it could not be found.

expected output

error TS2879: Using JSX fragments requires fragment factory 'X' to be in scope, but it could not be found.

Fix

Enable JSX in tsconfig.json

WHEN Using JSX syntax in TypeScript files

Enable JSX in tsconfig.json
// tsconfig.json
{
  "compilerOptions": {
    "jsx": "react-jsx"  // or "react", "preserve", etc.
  }
}

Why this works

The '--jsx' option tells TypeScript how to transform JSX; choose 'react-jsx' for React 17+ or 'react' for older versions.

Sources
Official documentation ↗

TypeScript Compiler Diagnostics

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