/**
 * Settings storage backends for SettingsManager.
 *
 * A SettingsStorage abstracts read-modify-write of the raw settings JSON for a
 * scope under an exclusive lock. FileSettingsStorage persists to the global and
 * project settings.json with cross-process file locking; InMemorySettingsStorage
 * keeps them in memory for tests. Extracted from settings-manager.ts.
 */
export type SettingsScope = "global" | "project";
export interface SettingsStorage {
    withLock(scope: SettingsScope, fn: (current: string | undefined) => string | undefined): void;
}
export interface SettingsError {
    scope: SettingsScope;
    error: Error;
}
export declare class FileSettingsStorage implements SettingsStorage {
    private globalSettingsPath;
    private projectSettingsPath;
    constructor(cwd: string, agentDir: string);
    private acquireLockSyncWithRetry;
    withLock(scope: SettingsScope, fn: (current: string | undefined) => string | undefined): void;
}
export declare class InMemorySettingsStorage implements SettingsStorage {
    private global;
    private project;
    withLock(scope: SettingsScope, fn: (current: string | undefined) => string | undefined): void;
}
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