/**
 * CompilationCache — entity #3 from `data-model.md`.
 *
 * Stores the result of compiling each (schemaFile, variant, configHash)
 * triple to a generated form module. Maintains a reverse index so HMR can
 * invalidate every entry that depends on a given schema file in O(1).
 *
 * The cache is single-threaded: Vite runs plugin hooks sequentially on the
 * main event loop, so no locking is needed.
 */
import type { CompilationEntry, GenerationTarget } from './types.js';
export interface CacheStats {
    /** Number of entries currently in the cache. */
    size: number;
    /** Number of cache hits since the cache was created. */
    hits: number;
    /** Number of cache misses since the cache was created. */
    misses: number;
}
export interface CompilationCache {
    /** Look up a cached compilation by target. Returns undefined on miss. */
    get(target: GenerationTarget): CompilationEntry | undefined;
    /** Store a compilation result. Updates the reverse index. */
    set(target: GenerationTarget, entry: CompilationEntry): void;
    /**
     * Evict every entry whose `schemaFile` equals the given path.
     * Returns the list of evicted cache keys for HMR fan-out.
     */
    invalidateByFile(schemaFile: string): string[];
    /**
     * Evict every cache entry. Used when the config file changes.
     * Returns the list of evicted cache keys for HMR fan-out.
     */
    invalidateAll(): string[];
    /** Snapshot of cache size and hit/miss counters. */
    stats(): CacheStats;
}
export declare function createCompilationCache(): CompilationCache;
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