EC
TS18007
TypeScriptERRORNotableTypeHIGH confidence

JSX expressions may not use the comma operator. Did you mean to write an array?

Production Risk

Build will fail; resolve before shipping.

What this means

A TypeScript diagnostic (TS18007): JSX expressions may not use the comma operator. Did you mean to write an array?. This diagnostic is emitted by the TypeScript compiler when jSX expressions may not use the comma operator. Did you mean to write an array?.

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 TS18007 during type checking.

trigger — this will error
trigger — this will error
// Triggers TS18007
// JSX expressions may not use the comma operator. Did you mean to write an array?

expected output

error TS18007: JSX expressions may not use the comma operator. Did you mean to write an array?

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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