export type CheckStatus = 'pass' | 'warn' | 'fail';
export interface DoctorCheck {
    id: string;
    label: string;
    status: CheckStatus;
    detail: string;
    /** What to do about a warning or failure. */
    fix?: string;
}
export interface DoctorContext {
    projectDir: string;
    /** The environment as the project sees it, `.env` loaded. */
    env: Record<string, string | undefined>;
    nodeVersion: string;
    /** Network and service probes; off in tests that only check the project files. */
    probe: boolean;
    fetch?: typeof fetch;
}
/** Fills `env` with the variables of the project's `.env` that it does not set already. */
export declare function loadProjectEnv(projectDir: string, env?: Record<string, string | undefined>): void;
/** Whether `version` (like `v22.23.1`) satisfies a `>=x.y.z` range, the only form engines use here. */
export declare function satisfiesMinimum(version: string, range: string): boolean;
/** Variables `.env.example` lists without a leading `#`: the ones the project requires. */
export declare function requiredVariables(projectDir: string): string[];
/**
 * The version of `name` the project resolves, `undefined` when it is not
 * installed. Plug'n'Play installs are read through Yarn's own API, others the
 * way Node looks packages up: node_modules of the project and every directory
 * above it, so hoisted packages of a monorepo count.
 */
export declare function installedVersion(projectDir: string, name: string): string | undefined;
/** Host and port of a service URL such as `redis://localhost:6379`, with the scheme's default port. */
export declare function endpointOf(url: string, defaultPort: number): {
    host: string;
    port: number;
} | undefined;
/** Whether a TCP connection to `host:port` opens within `timeoutMs`. */
export declare function canConnect(host: string, port: number, timeoutMs?: number): Promise<boolean>;
/** Everything `cogitator doctor` checks, in the order it shows them. */
export declare function runDoctor(context: DoctorContext): Promise<DoctorCheck[]>;
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