Use a bare-bones client and the command you need to make an API call.

import { MatchmakerServiceClient, JoinLobbyCommand } from "@rivet-gg/matchmaker"; // ES Modules import
// const { MatchmakerServiceClient, JoinLobbyCommand } = require("@rivet-gg/matchmaker"); // CommonJS import
const client = new MatchmakerServiceClient(config);
const command = new JoinLobbyCommand(input);
const response = await client.send(command);

JoinLobbyCommandInput for command's input shape.

JoinLobbyCommandOutput for command's response shape.

config for MatchmakerServiceClient's config shape.