import type { Facts, FilePatch, MergeTreePreflight, Oid, PatchIdentity, PathChange, RangeDiffEntry } from "./index.js";
/**
 * An in-memory Facts double for tests and playgrounds. Configure only the
 * questions a given test asks; any unconfigured method throws when called,
 * matching the contract's "throw = infrastructure failure" rule.
 *
 * Range-keyed tables use the key `${base}..${head}`.
 */
export interface MemoryFactsConfig {
    /** File contents keyed by `${revision}:${path}`; absent keys read as `null`. */
    readonly files?: Readonly<Record<string, string>>;
    /** Changes for every range (an array) or per range (keyed by `${base}..${head}`). */
    readonly changes?: readonly PathChange[] | Readonly<Record<string, readonly PathChange[]>>;
    /** Patch identities keyed by `${base}..${head}`. */
    readonly patchIds?: Readonly<Record<string, PatchIdentity>>;
    readonly patches?: Readonly<Record<string, readonly FilePatch[]>>;
    readonly isAncestor?: (ancestor: Oid, descendant: Oid) => boolean;
    readonly mergeBase?: (a: Oid, b: Oid) => Oid | null;
    readonly rangeDiffs?: Readonly<Record<string, readonly RangeDiffEntry[]>>;
    readonly mergeTreePreflights?: Readonly<Record<string, MergeTreePreflight>>;
}
export declare function memoryFacts(config?: MemoryFactsConfig): Facts;
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