/**
 * Pure Node-major-version check. Fails *open* on unparseable input (returns ok)
 * so a version-string oddity can never block the CLI — the real enforcement of
 * a hard floor is the `engines` field; this is the friendly fast-fail message.
 */
export declare function checkNodeMajor(versionString: string, min?: number): {
    ok: true;
} | {
    ok: false;
    message: string;
};
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