export interface DefaultEntry {
    /** File extension without leading dot (e.g. "rels", "xml", "png"). */
    ext: string;
    contentType: string;
}
export interface OverrideEntry {
    /** Part name path including leading slash (e.g. "/xl/workbook.xml"). */
    partName: string;
    contentType: string;
}
export interface Manifest {
    defaults: DefaultEntry[];
    overrides: OverrideEntry[];
}
export declare function makeManifest(): Manifest;
/** Register a default content type for an extension. Idempotent. */
export declare function addDefault(m: Manifest, ext: string, contentType: string): void;
/** Register an Override for a specific part. Idempotent. */
export declare function addOverride(m: Manifest, partName: string, contentType: string): void;
export declare function findOverride(m: Manifest, partName: string): OverrideEntry | undefined;
/** Find the first Override matching a content type. */
export declare function findOverrideByContentType(m: Manifest, contentType: string): OverrideEntry | undefined;
export declare function manifestToBytes(m: Manifest): Uint8Array;
export declare function manifestFromBytes(bytes: Uint8Array | string): Manifest;