`react-doctor/jsx-numeric-and-leaked-render`

Numeric && renders a stray 0

Category: Bugs
Severity: warn
Source: oxlint-plugin-react-doctor
Framework: global
Enabled when: always
Default: Enabled

Validate the diagnostic

Confirm the reported code matches this rule before you edit it.

Confirm the reported code matches react-doctor/jsx-numeric-and-leaked-render. Compare it with the Before example and verify the same API, framework, and execution context. Treat it as a false positive only when one of those conditions differs.

Compare the code

The corrected pattern shows a focused way to address the diagnostic.

Reported pattern

const List = ({ items }) => <>{items.length && <Results items={items} />}</>;

Corrected pattern

const List = ({ items }) => (
  <>{items.length > 0 ? <Results items={items} /> : null}</>
);

How to fix

Use the corrected pattern as a reference. Preserve behavior that the rule does not require you to change.

Copyable fix prompt

Copy this self-contained prompt into your coding agent after you confirm the diagnostic.

Fix every confirmed react-doctor/jsx-numeric-and-leaked-render diagnostic in the current repository. Required change: - In {items.length && <List/>} React renders a literal 0 when the count is 0. Compare explicitly (items.length > 0 && <List/>) or use a ternary (items.length ? <List/> : null).

Reference transformation:Before:

const List = ({ items }) => <>{items.length && <Results items={items} />}</>;

After:

const List = ({ items }) => (
  <>{items.length > 0 ? <Results items={items} /> : null}</>
);

Constraints: - Confirm the reported code matches the Before pattern. - Make the smallest change that fixes the root cause. - Preserve behavior and interfaces unrelated to this diagnostic. - Reuse existing project components, utilities, and conventions. - Do not introduce render-phase side effects, render-phase state updates, or Hooks rule violations. - Adapt identifiers and framework details instead of copying blindly. - Do not disable the rule or suppress matching code. Verification: - Run focused tests for the changed behavior. - Run React Doctor and confirm this diagnostic no longer appears. - Report the files changed and any checks you could not run.

More Bugs rules from the rules reference:

react-doctor/jsx-props-no-spread-multi: Spread each unique expression at most once per JSX element.
react-doctor/mobx-no-make-auto-observable-in-inheritance: Unsupported MobX auto-observable inheritance
react-doctor/mobx-no-observer-wrapped-memo: Invalid MobX observer wrapper order
react-doctor/mobx-reaction-disposer-discarded: MobX reaction disposer discarded
react-doctor/motion-animate-presence-must-outlive-child: AnimatePresence unmounts with its exiting child

react-doctor/jsx-numeric-and-leaked-render