/**
 * Runs the CDK Language Server command.
 *
 * With `--features`, prints the LSP capability manifest as JSON and exits.
 * Otherwise starts the server, which speaks LSP/JSON-RPC on stdin/stdout -- in
 * that mode the command must not write anything else to stdout (CDK CLI logs go
 * to stderr, keeping the protocol channel clean). The server runs until the LSP
 * client closes the stdio channel (stdin end), then exits 0.
 */
export declare function lsp(options?: {
    readonly features?: boolean;
}): Promise<number>;