@aws-sdk/middleware-serde/dist-es/serializerMiddleware.js

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export const serializerMiddleware = (options, serializer) => (next, context) => async (args) => {
    const endpoint = context.endpointV2?.url && options.urlParser
        ? async () => options.urlParser(context.endpointV2.url)
        : options.endpoint;
    if (!endpoint) {
        throw new Error("No valid endpoint provider available.");
    }
    const request = await serializer(args.input, { ...options, endpoint });
    return next({
        ...args,
        request,
    });
};