/**
 * Proxy wrapper for returned values.
 *
 *  @module
 */
import { CACHED_METADATA, METADATA } from "./symbols";
import { IAFileAwait, JsonObject, Metadata, VFile } from "./types";
/**
 * This accepts a `Promise`, and delegates its methods to the resolved result of the `Promise`.
 *
 * If the eventual result is null, the invoking the data access methods will return `undefined`.
 *
 * Use {@link AFileAwait.exists} to throw an {@link VirtualFileNotFound} error if the file is not found.
 * ```javascript
 * const data = FS.find('/nofile').exists.json();
 * ```
 */
export declare class AFileAwait implements IAFileAwait {
    #private;
    /**
     *
     * @param target The `Promise` of a result.
     * @param name The name of the file, if available.
     */
    constructor(target: Promise<VFile | null>, name?: string);
    url(): Promise<string | undefined>;
    json(): Promise<JsonObject | undefined>;
    blob(): Promise<Blob | undefined>;
    text(): Promise<string | undefined>;
    arrayBuffer(): Promise<ArrayBuffer | undefined>;
    csv(): Promise<string | undefined>;
    tsv(): Promise<string | undefined>;
    /**
     * @returns the name, if it was supplied on construction, or if
     * the promise has resolved. Otherwise, returns `'(unresolved)'`;
     */
    get name(): string;
    /**
     * Awaiting on this will yield the original result, including `null` if not found.
     */
    get target(): Promise<VFile | null>;
    /**
     * Chaining method that throws an error if the file was not found.
     * @returns The underlying file object.
     */
    get exists(): AFileAwait;
    [METADATA]: Metadata | undefined;
    [CACHED_METADATA]: Metadata | undefined;
    /**
     * Preserve the class name across minification.
     */
    [Symbol.toStringTag]: 'AFileAwait';
}
/**
 * The error thrown when a file is not found in the virtual filesystem.
 * This is only thrown by [.check()](#AFileAwait.check).
 */
export declare class VirtualFileNotFound extends Error {
    constructor(message?: string);
    /**
     * Preserve the class name across minification.
     */
    [Symbol.toStringTag]: 'VirtualFileNotFound';
}
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