/**
 * Native Workspace Folder Picker
 *
 * Provides:
 * - pickWorkspaceDirectory: Opens the host folder picker independently of
 *   HTTP routing so headless tests can replace this boundary.
 */
/** Error raised when the host has no supported graphical folder picker. */
export declare class WorkspacePickerUnavailableError extends Error {
    constructor();
}
/**
 * Opens the native directory chooser for the current operating system.
 *
 * @returns Selected path, or null when the user cancels.
 */
export declare function pickWorkspaceDirectory(): string | null;
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