serverless-spy/node_modules/@smithy/util-endpoints/dist-es/lib/substring.js

CDK-based library for writing elegant integration tests on AWS serverless architecture and an additional web console to monitor events in real time.

export const substring = (input, start, stop, reverse) => {
    if (start >= stop || input.length < stop) {
        return null;
    }
    if (!reverse) {
        return input.substring(start, stop);
    }
    return input.substring(input.length - stop, input.length - start);
};