export declare const IDENTITY_FILENAME = "memo.identity.yaml";
/** One element's persisted identity. */
export interface ElementIdentity {
    shortId?: string;
    uuid?: string;
}
/** `package::name` → identity. */
export type IdentityRegistry = Record<string, ElementIdentity>;
/** The registry key for an element. */
export declare function identityKey(element: {
    id: string;
    package?: string;
}): string;
/**
 * Read the registry. A missing file is an empty registry, not an error: the
 * first build of a project legitimately has no prior identities.
 */
export declare function readIdentityRegistry(projectRoot: string): IdentityRegistry;
/**
 * Write the registry, preserving entries whose elements are no longer present.
 *
 * Retired entries are what stop a number being reused, so they are kept rather
 * than pruned. They are cheap, and dropping them is the one change that would
 * make the file unsafe.
 */
export declare function writeIdentityRegistry(projectRoot: string, assigned: IdentityRegistry, prior?: IdentityRegistry): void;
/** Serialize to the same hand-written YAML subset the lockfile uses. */
export declare function serializeIdentityRegistry(registry: IdentityRegistry): string;
/** Parse the registry (hand-written for the simple two-field format). */
export declare function parseIdentityRegistry(content: string): IdentityRegistry;
/**
 * The prior `shortId` assignments for one prefix family, as
 * `assignSequentialShortIds` expects them: element id → shortId.
 *
 * Keys are un-qualified here because assignment happens per prefix over element
 * ids; the qualified key is only the persistence form.
 */
export declare function priorShortIds(registry: IdentityRegistry): Map<string, string>;
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