react type_error ai_generated true

Type 'Element | undefined' is not assignable to type 'ReactElement' (JSX return type)

ID: react/jsx-element-type-not-assignable

Also available as: JSON · Markdown
90%Fix Rate
92%Confidence
50Evidence
2023-01-01First Seen

Version Compatibility

VersionStatusIntroducedDeprecatedNotes
18 active — — —

Root Cause

Component might return undefined/null which isn't valid JSX. TypeScript strict mode.

generic

Workarounds

  1. 95% success Ensure component always returns JSX or null (never undefined) 
    if (!data) return null;  // not: if (!data) return;

    Sources: https://react.dev/learn/conditional-rendering

  2. 90% success Use conditional rendering: {condition && <Component />} or ternary 
    {condition && <Component />} or ternary

    Sources: https://react.dev/learn/conditional-rendering

Dead Ends

Common approaches that don't work:

  1. Wrap return in <></> 65% fail

    Fragment doesn't fix undefined — you need to handle the null case

Error Chain

Frequently confused with: