EC
TS6146
TypeScriptERRORNotableConfigHIGH confidence

Specify the JSX factory function to use when targeting 'react' JSX emit, e.g....

Production Risk

Build will fail; resolve before shipping.

What this means

A compiler configuration error (TS6146): Specify the JSX factory function to use when targeting 'react' JSX emit, e.g. 'React.createElement' or 'h'.. This diagnostic is emitted by the TypeScript compiler when specify the JSX factory function to use when targeting 'react' JSX emit, e.g. 'React.createElement' or 'h'..

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 TS6146 during type checking.

trigger — this will error
trigger — this will error
// Triggers TS6146
// Specify the JSX factory function to use when targeting 'react' JSX emit, e.g. 'React.createElement' or 'h'.

expected output

error TS6146: Specify the JSX factory function to use when targeting 'react' JSX emit, e.g. 'React.createElement' or 'h'.

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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