import { Optional } from '@salesforce/ts-types';
/**
 * The name of the project config file.
 *
 * @ignore
 */
export declare const SFDX_PROJECT_JSON = "sfdx-project.json";
/**
 * Performs an upward directory search for an sfdx project file. Returns the absolute path to the project.
 *
 * **See** {@link SFDX_PROJECT_JSON}
 *
 * **See** {@link traverseForFile}
 *
 * **Throws** *{@link SfError}{ name: 'InvalidProjectWorkspaceError' }* If the current folder is not located in a workspace.
 *
 * @param dir The directory path to start traversing from.
 * @ignore
 */
export declare function resolveProjectPath(dir?: string): Promise<string>;
/**
 * Performs a synchronous upward directory search for an sfdx project file. Returns the absolute path to the project.
 *
 * **See** {@link SFDX_PROJECT_JSON}
 *
 * **See** {@link traverseForFile}
 *
 * **Throws** *{@link SfError}{ name: 'InvalidProjectWorkspaceError' }* If the current folder is not located in a workspace.
 *
 * @param dir The directory path to start traversing from.
 * @ignore
 */
export declare function resolveProjectPathSync(dir?: string): string;
/**
 * These methods were moved from the deprecated 'fs' module in v2 and are only used in sfdx-core above
 *
 * They were migrated into the 'traverse' constant in order to stub them in unit tests
 */
export declare const traverse: {
    /**
     * Searches a file path in an ascending manner (until reaching the filesystem root) for the first occurrence a
     * specific file name.  Resolves with the directory path containing the located file, or `null` if the file was
     * not found.
     *
     * @param dir The directory path in which to start the upward search.
     * @param file The file name to look for.
     */
    forFile: (dir: string, file: string) => Promise<Optional<string>>;
    /**
     * Searches a file path synchronously in an ascending manner (until reaching the filesystem root) for the first occurrence a
     * specific file name.  Resolves with the directory path containing the located file, or `null` if the file was
     * not found.
     *
     * @param dir The directory path in which to start the upward search.
     * @param file The file name to look for.
     */
    forFileSync: (dir: string, file: string) => Optional<string>;
};