/**
 * Browser stub for `substituteEnv.ts`. `process.env` doesn't exist in
 * the browser globals; the SDK's remote-MCP feature is a server-side
 * concern (subprocess + arbitrary fetch authority), so the browser
 * bundle reaches this code only via the McpClientPool import chain —
 * never to actually substitute anything.
 *
 * Returns the input verbatim. If a browser consumer ever wires a remote
 * MCP, the {@link McpClientPool} browser stub rejects the register call
 * before this helper is reached.
 */
export declare function substituteEnvInString(value: string): string;
export declare function substituteEnvInHeaders(headers: {
    readonly [key: string]: string;
} | undefined): {
    [key: string]: string;
} | undefined;
//# sourceMappingURL=substituteEnv.browser.d.ts.map