EC
TS17001
TypeScriptERRORNotableTypeHIGH confidence

JSX elements cannot have multiple attributes with the same name.

Production Risk

Build will fail; resolve before shipping.

What this means

A TypeScript diagnostic (TS17001): JSX elements cannot have multiple attributes with the same name.. This diagnostic is emitted by the TypeScript compiler when jSX elements cannot have multiple attributes with the same name..

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 TS17001 during type checking.

trigger — this will error
trigger — this will error
// Triggers TS17001
// JSX elements cannot have multiple attributes with the same name.

expected output

error TS17001: JSX elements cannot have multiple attributes with the same name.

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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