EC
TS2657
TypeScriptERRORNotableTypeHIGH confidence

JSX expressions must have one parent element.

Production Risk

Build will fail; resolve before shipping.

What this means

A type-checking error (TS2657): JSX expressions must have one parent element.. This diagnostic is emitted by the TypeScript compiler when jSX expressions must have one parent element..

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 TS2657 during type checking.

trigger — this will error
trigger — this will error
// Triggers TS2657
// JSX expressions must have one parent element.

expected output

error TS2657: JSX expressions must have one parent element.

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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