import type { Log } from "@intentic/local-agent";
export declare const agentPath: string;
export declare const assetUrl: () => string;
export type Probe = {
    readonly kind: "version";
    readonly version: string;
} | {
    readonly kind: "no-version-command";
} | {
    readonly kind: "unusable";
};
export type UpgradeOutcome = {
    readonly kind: "current";
    readonly version: string;
    readonly note?: string;
} | {
    readonly kind: "upgraded";
    readonly from: string;
    readonly to: string;
} | {
    readonly kind: "failed";
    readonly reason: string;
};
export interface UpgradeExec {
    readonly fetchTo: (url: string, dest: string) => Promise<void>;
    readonly probe: (binary: string) => Probe;
    readonly swap: (from: string, to: string) => Promise<void>;
    readonly stopWatcher: () => Promise<number | undefined>;
    readonly startWatcher: () => Promise<void>;
    readonly watcherAlive: () => Promise<boolean>;
    readonly discard: (path: string) => Promise<void>;
}
export declare const runUpgrade: (exec: UpgradeExec, url: string, installed: string, force: boolean, log: Log) => Promise<UpgradeOutcome>;
export declare const realUpgradeExec: (stopWatcher: () => Promise<number | undefined>, startWatcher: () => Promise<void>, alive: () => Promise<boolean>) => UpgradeExec;
export declare const upgradeMessage: (outcome: UpgradeOutcome) => string;
//# sourceMappingURL=upgrade.d.ts.map