/** Vite-style dev-server port resolution.
 *
 *  Probes the requested port. If busy, falls through to the next port up
 *  to `portRange-1` neighbors. With `strictPort: true`, fails on the very
 *  first conflict so users who pin a port know immediately.
 *
 *  Bun's `Bun.serve` rejects EADDRINUSE asynchronously and only after
 *  partially binding, which is awkward to clean up — `node:net.createServer`
 *  is simpler and battle-tested for this exact "is anyone listening here"
 *  probe. */
export type ResolveDevPortOptions = {
    strictPort?: boolean;
    portRange?: number;
    host?: string;
};
export declare const isPortFree: (port: number, host?: string) => Promise<boolean>;
export type ResolveDevPortResult = {
    port: number;
    fellBack: boolean;
};
export declare const resolveDevPort: (requestedPort: number, options?: ResolveDevPortOptions) => Promise<{
    fellBack: boolean;
    port: number;
}>;