Zephyr tree shaking for PureScript Language https://github.com/coot/zephyr#readme

Latest on Hackage:0.1.4

This package is not currently in any snapshots. If you're interested in using it, we recommend adding it to Stackage Nightly. Doing so will make builds more reliable, and allow stackage.org to host generated Haddocks.

MPL-2.0 licensed and maintained by Marcin Szamotulski


Maintainer: coot Build Status

Experimental tree shaking tool for PureScript.


# compile your project (or use `pulp build -- --dump-corefn`)
purs compile -g corefn bower_components/purescript-*/src/**/*.purs src/**/*.purs

# run `zephyr`
zephyr -f Main.main

# bundle your code

zephyr reads corefn json representation from output directory, removes non transitive dependencies of entry points and dumps common js modules (or corefn representation) to dce-output directory.

Zephyr eval

Zephyr can evaluate some literal expressions.

import Config (isProduction)

a = if isProduction
  then "api/prod/"
  else "api/dev/"

will be transformed to

a = "api/prod/"

whenever isProduction is true. This allows you to have different development and production environment while still ship a minified code in your production environment. You may define isProduction in a module under a src-prod directory and include it when compiling production code with pulp build -I src-prod and to have another copy for your development environment under src-dev where isProduction is set to false.

Build & Test

To build just run stack build (or with nix stack --nix build). If you want to run test stack --nix test is the prefered method, stack test will also work, unless you don’t have one of the dependencies: git, node, npm and bower.


The -f switch is not 100% safe. When on zephyr will remove exports from foreign modules that seems to be not used: are not used in purescript code and seem not to be used in the foreign module. If you simply assign to exports using javascript dot notation then you will be fine, but if you use square notation exports[var] in a dynamic way (i.e. var is a true variable rather than a string literal) then zephyr might remove code that shouldn’t be removed.

It is good to run webpack or rollup to run a javascript tree shaking algorithm on the javascript code that is pulled in your bundle by your by your foreign imports.


It is tested on dozeon of various projects of @alexmingoia, @bodil, @coot, @purescript-contrib and @slamdata including:

Checkout unit test suite to see all of them.

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