/**
 * Runtime detection utilities. Kept out of the `utils` barrel on purpose —
 * these are internal implementation details used to populate the
 * `x-aptos-client` telemetry header and are not part of the public SDK API.
 *
 * Consumers that need to branch on the current runtime should inspect
 * `globalThis` themselves (e.g. `typeof Bun !== "undefined"`) rather than
 * relying on these helpers.
 *
 * @internal
 */
/**
 * Identifier for the JavaScript runtime the SDK is currently running in.
 * Used for telemetry (e.g. the `x-aptos-client` header).
 *
 * @internal
 */
export type RuntimePlatform = "node" | "browser" | "bun" | "deno" | "react-native" | "unknown";
/**
 * Detects the JavaScript runtime the SDK is currently running in.
 *
 * Detection precedence (most specific first): react-native, deno, bun, browser, node.
 * Falls back to "unknown" if detection fails or the environment is hostile.
 *
 * @internal
 */
export declare function getRuntimePlatform(): RuntimePlatform;
/**
 * Returns a compact runtime tag for the `x-aptos-client` telemetry header.
 * Node, Bun, and Deno expose their engine version cheaply and synchronously;
 * browsers do not (userAgent is already forwarded as `User-Agent`), and React
 * Native's JS-engine version is not reachable from `src/` without a
 * platform-specific import.
 *
 * Shape examples:
 *   - "node/22.12.0"
 *   - "bun/1.1.38"
 *   - "deno/2.1.4"
 *   - "browser" | "react-native" | "unknown" (no version suffix)
 *
 * @internal
 */
export declare function getRuntimePlatformTag(): string;
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