import type { HostRuntime } from "../../src/platform/compat/process/host-runtime.js";
/** Read one strictly validated TCP port from the host environment. */
export declare function parsePortEnv(host: HostRuntime, name: string): number | undefined;
/** Return whether one host environment value is a valid TCP port. */
export declare function isValidPortEnv(host: HostRuntime, name: string): boolean;
/** Resolve PORT, then VERYFRONT_PORT, then the supplied default. */
export declare function resolveEnvironmentPort(host: HostRuntime, fallback: number): number;
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