/**
 * Starts the CDK Language Server over stdio.
 *
 * The server speaks LSP/JSON-RPC on stdin/stdout, so this command must not
 * write anything else to stdout. CDK CLI logs go to stderr by default, which
 * keeps the protocol channel clean. The process runs until the LSP client
 * closes the stdio channel (stdin end), then exits 0.
 */
export declare function lsp(): Promise<number>;