/**
 * Shared types and channel constant for successful-HMR-patch reporting, the
 * counterpart of `hmr-incompatibility.ts`. The page runtime reports each patch
 * that landed over {@link HMR_PATCH_CHANNEL}; the node side keeps the newest
 * few so the DevTools panel and the `hmr-history` agent tool can answer "did
 * my edit land" without a recording running.
 */
/** What happened to custom elements a patch re-created. */
export type HmrPatchChildState = 'reset' | 'transfer' | 'reuse';
export interface HmrPatchEvent {
    tagName: string;
    /**
     * Source file of the component, relative to the Vite root. Absent on the
     * wire: the page runtime does not know it, so the node side fills it from
     * the component tree's `source` when the tag is in it.
     */
    file?: string;
    /** Live instances the patch updated. */
    instances: number;
    /** The tag's patch count: 1 after the first hot patch, 2 after the second. */
    generation: number;
    /** Wall time the synchronous patch took, in ms (re-renders are async and not included). */
    durationMs: number;
    /** The `hmr.childState` mode in force for this patch. */
    childState: HmrPatchChildState;
    /** `Date.now()` in the browser, the same clock as `HmrIncompatibilityEvent.time`. */
    at: number;
}
/** HMR channel the page runtime uses to report an {@link HmrPatchEvent}. */
export declare const HMR_PATCH_CHANNEL = "lit:hmr:patched";
/** How many patches the node-side history keeps and the panel mirrors. */
export declare const MAX_HMR_PATCHES = 50;
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