2022-04-12 15:00:47 -04:00

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The current document was written quickly and not exhaustively, yet, it's unfinished. Template here

Contributing to Squiggle

We welcome contributions from developers, especially people in react/typescript, rescript, and interpreters/parsers. We also are keen to hear issues filed by users!

Squiggle is currently pre-alpha.

Quick links

Roadmap to the alpha
The team presently communicates via the EA Forecasting and Epistemics slack (channels #squiggle and #squiggle-ops), you can track down an invite by reaching out to Ozzie Gooen
Squiggle documentation
Rescript documentation
You can email quinn@quantifieduncertainty.org if you need assistance in onboarding or if you have questions

Bug reports

Anyone (with a github account) can file an issue at any time. Please allow Quinn, Sam, and Ozzie to triage, but otherwise just follow the suggestions in the issue templates.

Project structure

Squiggle is a monorepo with four packages.

components is where we improve reactive interfacing with Squiggle
playground is the site playground.squiggle-language.com
squiggle-lang is where the magic happens: probability distributions, the interpreter, etc.
website is the site squiggle-language.com

Deployment ops

We use netlify, and it should only concern Quinn, Sam, and Ozzie.

Development environment, building, testing, dev server

You need yarn.

Being a monorepo, where packages are connected by dependency, it's important to follow README.mds closely. Each package has it's own README.md, which is where the bulk of information is.

We aspire for ci.yaml and README.mds to be in one-to-one correspondence.

If you're on NixOS

You'll need to run a command like this in order to get yarn build to run, especially in packages/squiggle-lang.

patchelf --set-interpreter $(patchelf --print-interpreter $(which mkdir)) ./node_modules/gentype/gentype.exe

See here

Pull request protocol

Please work against develop branch. Do not work against master.

For rescript code: Quinn and Ozzie are reviewers
For js or typescript code: Sam and Ozzie are reviewers
For ops code (i.e. yaml, package.json): Quinn and Sam are reviewers

Autopings are set up: if you are not autopinged, you are welcome to comment, but please do not use the formal review feature, send approvals, rejections, or merges.

Code Quality

Aim for at least 8/10* quality in /packages/squiggle-lang, and 7/10 quality in /packages/components.
If you submit a PR that is under a 7, for some reason, describe the reasoning for this in the PR.

This quality score is subjective.

Rescript Style

Use -> instead of |>
Note: Our codebase used to use |>, so there's a lot of that in the system. We'll gradually change it.

Use x -> y -> z instead of let foo = y(x); let bar = z(foo)

Don't use anonymous functions with over three lines
Bad:

  foo
  -> E.O.fmap(r => {
    let a = 34;
    let b = 35;
    let c = 48;
    r + a + b + c
  }

Good:

  let addingFn = (r => {
    let a = 34;
    let b = 35;
    let c = 48;
    r + a + b + c
  }
  foo -> addingFn

Write out types for everything, even if there's an interface file
We'll try this for one month (ending May 5, 2022), then revisit.

Use the Rescript optional default syntax
Rescript is clever about function inputs. There's custom syntax for default and optional arguments. In the cases where this applies, use it.

From https://rescript-lang.org/docs/manual/latest/function:

// radius can be omitted
let drawCircle = (~color, ~radius=?, ()) => {
  setColor(color)
  switch radius {
  | None => startAt(1, 1)
  | Some(r_) => startAt(r_, r_)
  }
}

Use named arguments
If a function is called externally (in a different file), and has either:

Two arguments of the same type
Three paramaters or more.

Module naming: Use x_y as module names
For example: Myname_Myproject_Add.res. Rescript/Ocaml both require files to have unique names, so long names are needed to keep different parts separate from each other.

See this page for more information. (Though note that they use two underscores, and we do one. We might refactor that later.

Module naming: Don't rename modules We have some of this in the Reducer code, but generally discourage it.

Use interface files (.resi) for files with very public interfaces

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