5 releases

0.2.2 Apr 11, 2023
0.2.1 Apr 10, 2023
0.2.0 Apr 10, 2023
0.1.0 Apr 7, 2023

#649 in WebAssembly

45 downloads per month
Used in depit-cli




depit is a simple WIT dependency manager binary and Rust library, which manages your wit/deps. It's main objective is to ensure that whatever is located in your wit/deps is consistent with your dependency manifest (default: wit/deps.toml) and dependency lock (default: wit/deps.lock).


A dependency manifest is a TOML-encoded table mapping dependency names to their source specifications. In it's simplest form, a source specification is a URL string of a gzipped tarball containing a directory tree with a wit subdirectory containing wit files.


# wit/deps.toml
http = "https://github.com/WebAssembly/wasi-http/archive/6c6855a7329fb040a48ecdbad1765be8e694416c.tar.gz"
io = "https://github.com/rvolosatovs/wasi-io/archive/v0.1.0.tar.gz"
logging = "https://github.com/WebAssembly/wasi-logging/archive/d106e59b25297d0496e6a5d221ad090e19c3aaa3.tar.gz"
poll = "https://github.com/WebAssembly/wasi-poll/archive/3ff76670b0d43bc7c8a224c2e65880a963416835.tar.gz"
random = "https://github.com/WebAssembly/wasi-random/archive/28970c50c3797c0087fa75a15e88bfa39b91e0a0.tar.gz"

A source specfication can also be a structure with the following fields:

  • url - same format as the URL string
  • sha256 - (optional) hex-encoded sha256 digest of the contents of the URL
  • sha512 (optional) hex-encoded sha512 digest of the contents of the URL


# wit/deps.toml
url = "https://github.com/WebAssembly/wasi-logging/archive/d106e59b25297d0496e6a5d221ad090e19c3aaa3.tar.gz"
sha256 = "4bb4aeab99e7323b30d107aab78e88b2265c1598cc438bc5fbc0d16bb63e798f"
sha512 = "13b52b59afd98dd4938e3a651fad631d41a2e84ce781df5d8957eded77a8e1ac4277e771a10225cd4a3a9eae369ed7e8fee6e26f9991a2caa7c97c4a758b1ae6"


Note, depit assumes that it has full control over wit/deps and so it may delete and modify contents of wit/deps at any time!


Use depit or depit lock to populate wit/deps using wit/deps.toml manifest and wit/deps.lock (will be created if it does not exist)


Use depit::lock! macro in build.rs of your project to automatically lock your wit/deps.

See crate documentation for more advanced use cases

Design decisions

  • depit is lazy by default and will only fetch/write when it absolutely has to
  • depit assumes that result of fetching from a URL is deterministic, that is contents returned by GET of a URL domain.com must always return exactly the same contents. Note, that you can use sha256 or sha512 fields in your manifest entry to invalidate the cache in this case


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