/**
 * `ref upgrade` command — applies a new release via the detected install method.
 *
 * See: spec/features/self-upgrade.md
 */
import type { Command } from "commander";
import { type UpgradeBinaryOptions, type UpgradeResult } from "../../upgrade/apply-binary.js";
import { type UpgradeNpmOptions } from "../../upgrade/apply-npm.js";
import { type InstallMethod } from "../../upgrade/detect.js";
export interface UpgradeCommandOptions {
    check?: boolean;
    version?: string;
    yes?: boolean;
    installDir?: string;
}
export interface RunUpgradeDeps {
    installMethod?: InstallMethod;
    argv1?: string;
    /** Defaults to `process.execPath`; replaces a bunfs virtual `argv1`. */
    execPath?: string;
    currentVersion?: string;
    upgradeBinaryFn?: (options: UpgradeBinaryOptions) => Promise<UpgradeResult>;
    upgradeNpmFn?: (options: UpgradeNpmOptions) => Promise<UpgradeResult>;
    stdout?: NodeJS.WritableStream;
    stderr?: NodeJS.WritableStream;
}
export interface RunUpgradeResult {
    exitCode: 0 | 1 | 2;
    method: InstallMethod;
    result?: UpgradeResult;
}
export declare function formatUpgradeResult(result: UpgradeResult): string;
export declare function runUpgrade(options: UpgradeCommandOptions, deps?: RunUpgradeDeps): Promise<RunUpgradeResult>;
export declare function registerUpgradeCommand(program: Command): void;
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