Common tools for general use


100.16.103010 days ago3 years agoMinified + gzip package size for @bitblit/ratchet in KB



Common utilities for Typescript and Node.


This library is very similar to my Wrench library - a set of things that I find myself doing over and over again. As Node/Typescript is a relatively new language for me in 2017/2018 (although Javascript on the client side is not), it is quite likely that there are better ways of doing things than the way I am doing them here.

This library is my first attempt to publish to NPM. I make no guarantees other than the standard one I make for all my libraries - that I will always rev the major version number if I do something that is not backwards compatible. As I improve this paragraph should go away.


yarn install @bitblit/ratchet




Since this is meant to be a very generic library and therefore I don't want to pull in a bunch of transitive dependencies, I am keeping myself to very, very few upstream libraries. However, I am making the following exceptions, because I use these libraries in literally every project I have ever done:

  • Luxon - because I always need better date handling than what comes with Javascript (was moment before 0.12.x)
  • Note on barrel files - All of Ratchet's barrel files are one level down. This is because otherwise everything I said above about transitive dependencies gets thrown out the window if you put them all in one big barrel file


The Daemon subpackage is to handle the case on AWS where you want to run a process asynchronously via Lambda (not waiting for the return on a API Gateway request) and check its results until it is finished. Daemon offers a thin wrapper around an S3 object that can be updated until it is finally replaced by the final results themselves. The end customer can be given the key to check on synchronously. Items are broken down by day (for easy flushing later) and by groups if desired.

Site Uploader

There is a tool in here called site uploader that is designed to help put completely static sites into S3 (basically a glorified aws s3 cp --recursive ...), while allowing you to set some of the more popular HTTP headers like Cache-Expires. If you use it you'll need to add this to your dev dependencies (since I didn't want it in the dependencies of Ratchet which is meant to also be used in the browser)

    "walk": "^2.3.14"

It will expect you to provide it a configuration file. I'll document it better later, but here is an example of such a configuration file (an Angular app I use, with a couple of custom HTML files with no extensions)

  "customMimeTypeMapping": {
    "md": "text/markdown; charset=UTF-8"

  "mapping": [
      "prefixMatch": "assets.*",
      "fileMatch": ".*",
      "putParams": {
        "CacheControl": "max-age=600",
        "Metadata": {}
      "description": "Files with no extension in the root dir",
      "prefixMatch": "$",
      "fileMatch": "^([^.]+)$",
      "putParams": {
        "CacheControl": "max-age=600",
        "ContentType": "text/html; charset=UTF-8"
      "description": "Javascript bundles in the root dir",
      "prefixMatch": "$",
      "fileMatch": ".*\\.bundle\\.js",
      "putParams": {
        "CacheControl": "max-age=86400"
      "description": "Default rule",
      "putParams": {
        "CacheControl": "max-age=30"

Notes on libraries that are used but must be purposely included (transitive dependencies)


Originally I was going to package this as 2 different libraries - one for just my AWS stuff, and the other for more generic stuff. Then I realized that even with the AWS stuff I would bring in AWS lib as a dev dependency because I do so much stuff on Lambda and Lambda already has the AWS library on it. So - Important note! If you use the AWS stuff in here you will need to do your own AWS dependency, something like :

    "aws-sdk": "^2.906.0",

Or none of the AWS stuff is going to work.

One more note on the AWS stuff - for most of my non-super-heavy-load stuff I work in us-east-1. I do this both because I am lazy and because that is where AWS releases the new stuff first. Because of this, you will see that while my code allows you to override the region, I always set a biased default. If you don't like that... sorry?


AthenaRatchet is a special case because the datasets you use with Athena tend to be so large you'll often need to work with only a chunk of them at a time. The AthenaRatchet depends on a couple more libraries that you'll need to use a chunk of the functionality - csv parses output files from Athena locally (much faster than having them do it) and tmp creates local tmp files for storage. It also uses 'fs' so, in case it's not already abundantly clear, this only works in Node, not in the browser. Not that you'd do much Athena work in the browser anyway, but I may break this up later if I see a need for that.

    "csv": "5.5.0",
    "tmp": "0.2.1",


The Observable ratchet is based on Observables through RXJS. If you use it, you'll need:

    "rxjs": "7.0.1",

Handlebars and CrossFetch

The simplified mailer for SES (aws/ses/mailer) can be provided with a remote template renderer, which assumes the template is a Handlebars template. If you use it, you'll need Handlebars (and Handlebars-Layouts, which isn't required but is highly recommended if you are doing much Handlebars work needing templates) and CrossFetch installed:

    "handlebars": "4.7.7",
    "handlebars-layouts": "3.1.4",
    "cross-fetch": "3.1.4"

I use PortableFetch to keep Ratchet usable on both the client and server side.


Ratchet includes a helper for validating objects that match swagger schemas in the model-validator package. If you use it, you'll need to include:

    "js-yaml": "4.0.0",
    "swagger-model-validator": "3.0.20",


Ha! No, seriously - all testing is done using Jest. To run them:

yarn test

Why not X? (Where X=Lodash, Underscore, Ramda, etc...)

Originally, my answer would be because I just didn't know about them. I know about them now (2019) and I use them quite a lot myself. Any code has impedence mismatches (either with the problem domain, or just with how I think about the problem) and so Ratchet is how I tackle some of these. If you think like me, Ratchet is for you! If not, it's ok - go use X. We're still friends.


I'll write notes-to-self here on how my deployment from CircleCI is actually going to work.

Following the notes from here. Important points:

  • Everything in the package that isn't in .gitignore or .npmignore gets uploaded. Review before post

For circleci using these notes

Looks like it's my standard - set a release tag and push to Github, CircleCI takes care of the rest:

    git commit -m "New stuff"
    git tag -a release-0.0.5 -m "Because I like it a lot"
    git push origin master --tags

Also following notes from here on converting the typescript into usable javascript+mapping stuff.


Pull requests are welcome, although I'm not sure why you'd be interested!

Version history

  • 0.0.x : Initial releases
  • 0.1.x - 0.4.x : TBD for when I feel like doing repo diving
  • 0.5.x : Breaking change to AthenaRatchet
  • 0.6.x : Breaking change to Mailer (adding Handlebars layouts)
  • 0.7.x : Breaking change to Mailer (switch to config object, add allowedDestinationEmails handling). Removed Gulp for security reasons.
  • 0.8.x : Updated to require Node 12.x. Switched to eslint. Adding cloudwatch insights helpers
  • 0.9.x : Adding CLI Ratchet, updating dependant libraries for security holes
  • 0.10.x : Adding CSV comparison, updating dependant libraries, Logger passthru functions for console on browser
  • 0.11.x : Adding ec2 ratchet, barrel files, wrap classes with CLI extensions, MapRatchet expander, trying a new module output, added max sizes to mailer config
  • Added StringWritable and Streaming CSV writer, ability to stream to a Daemon target
  • 0.12.x : Switched to Jest internally, updated libraries, switched from Moment to Luxon
  • 0.13.x : Updated libraries, moving to Barrelsby, adding model-validator
  • 0.14.x : Updated libraries, added streaming processors to DynamoRatchet
  • 0.15.x : Replaced portable-fetch with isomorphic-fetch once I saw that portable is just a less-supported branch
  • 0.16.x : Replaced isomorphic-fetch with cross-fetch since it has a "realFetch.call is not a fn" bug and is less supported
  • Added CSVRatchet and AlbAthenaLogRatchet
  • Added simplePutWithCollisionAvoidance to DynamoRatchet
  • Added simpleGetWithCounterDecrement to DynamoRatchet

If you find any bugs or have a feature request, please open an issue on github!

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