react/no-add-transition-type-outside-transition

Reports addTransitionType calls that are not lexically contained in a React startTransition callback. Enabled as an error in all and omitted from recommended.

React requires addTransitionType to run while a startTransition callback is active. See the React addTransitionType reference.

Incorrect

import { addTransitionType } from 'react';

addTransitionType('slide-forward');

Correct

import { addTransitionType, startTransition } from 'react';

startTransition(() => {
  addTransitionType('slide-forward');
  navigate('/next');
});

Analysis boundary

The rule recognizes inline callbacks and local function declarations or variables passed directly to startTransition. It does not build a call graph, so an external helper called by a transition callback can be reported even when the runtime call is valid. This boundary keeps the rule out of recommended.

There is no automatic fix.