/**
 * Python Discovery Service Types
 */
export type PythonEnvType = 'system' | 'conda' | 'pyenv' | 'venv' | 'homebrew' | 'uv' | 'pixi';
export interface PythonEnvironment {
    path: string;
    version: string;
    displayName: string;
    envType: PythonEnvType;
    envName: string | null;
    hasIpykernel: boolean;
    kernelName: string | null;
    externallyManaged: boolean;
    installHint: string | null;
}
export interface DiscoveryCandidate {
    path: string;
    envType: PythonEnvType;
    envName: string | null;
    base?: string;
}
export interface CacheData {
    environments: Record<string, PythonEnvironment>;
    timestamp: number;
}
export interface InstallKernelResult {
    kernelName: string;
    pythonPath: string;
    message: string;
}
export type KernelProvisionErrorCode = 'python_not_found' | 'externally_managed' | 'needs_ipykernel' | 'install_failed' | 'register_failed';
export declare class KernelProvisionError extends Error {
    code: KernelProvisionErrorCode;
    installHint?: string;
    constructor(message: string, code: KernelProvisionErrorCode, installHint?: string);
}
export interface CacheInfo {
    cachedCount: number;
    cacheAgeHours: number | null;
    cacheValid: boolean;
    cacheFile: string;
}
export declare const DEFAULT_CACHE_TTL_HOURS = 24;
export declare const DEFAULT_VERSION_CHECK_TIMEOUT_MS = 5000;
export declare const DEFAULT_IPYKERNEL_CHECK_TIMEOUT_MS = 10000;
export declare const DEFAULT_KERNEL_INSTALL_TIMEOUT_MS = 120000;
export declare const DEFAULT_REGISTRATION_TIMEOUT_MS = 60000;