/**
 * jsdom implements none of the `ElementInternals` form-association API — not `setFormValue`,
 * not `setValidity`, not the `checkValidity`/`reportValidity`/`validity`/`validationMessage`
 * mixin real browsers put on every `formAssociated: true` element, not even `FormData`
 * collecting a form-associated element's set value, or `<form>.reset()` invoking
 * `formResetCallback()`. Every one of those gaps is exercised by `useField()` (`@vielzeug/ore`),
 * so any package testing a form-associated component needs all of them, not just one.
 *
 * Opt-in via `install(afterEach, { formInternals: true })` (or call this directly) —
 * the patches are global monkey-patches, so suites without form-associated components
 * shouldn't pay for them. Returns an `uninstall()` that restores every patched global.
 *
 * Deliberately lives here rather than in each consuming package's own `vitest.setup.ts`: the
 * gap is in `ore`'s own form-association feature, not in any one consumer, so the fix belongs
 * with the feature. `walkFlatTree` handles form-associated custom elements across shadow
 * boundaries, so consumer packages do not need package-local copies of this polyfill.
 */
export declare const installFormInternalsPolyfill: () => (() => void);
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