export interface NodesetImageStore {
    /** the image stored under `key`, or undefined */
    get(key: string): Promise<Uint8Array | undefined>;
    /** keep `image` under `key`; a store may drop older images to stay within its size */
    put(key: string, image: Uint8Array): Promise<void>;
}
/** the key of the image of a source whose bytes hash to `sourceDigest` */
export declare function nodesetImageKey(sourceDigest: string): string;
/**
 * an in-memory store: for browsers, tests, and a process that loads the same files repeatedly.
 * The size cap counts the compressed bytes, which is all the store retains per entry: the loader
 * inflates an image for one load and lets the lines go afterwards
 */
export declare class MemoryNodesetImageStore implements NodesetImageStore {
    private readonly maxBytes;
    private readonly images;
    constructor(maxBytes?: number);
    get(key: string): Promise<Uint8Array | undefined>;
    put(key: string, image: Uint8Array): Promise<void>;
    get size(): number;
    keys(): string[];
}
/**
 * the store a plain `imageStore: true` selects where no file system store is available (the
 * browser, `generateAddressSpaceRaw`): one memory store for the process
 */
export declare function sharedMemoryNodesetImageStore(): MemoryNodesetImageStore;