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Datamitsu

Every stack comes with a configuration tax

ESLint. Prettier. Git hooks. You configure them once. Then again. Then every update breaks something different in each repo. datamitsu exists so you pay this tax only once.

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Configuration as code

A single JavaScript file describes your entire toolchain. Extend it, override it, compose it. Publish it as an npm package, gem, or pypi release — or share it as a remote file with hash verification. Every team inherits your decisions automatically.

datamitsu.config.js
/// <reference path=".datamitsu/datamitsu.config.d.ts" />

function getConfig(input) {
  return {
    ...input,
    apps: {
      ...input.apps,
      lefthook: { type: "binary", required: true },
      eslint:   { type: "fnm" },
      yamllint: { type: "uv" },
      ktlint:   { type: "jvm" },
    },
  };
}

globalThis.getConfig = getConfig;
globalThis.getMinVersion = () => "0.0.1";

Real output. Real project.

This is actual datamitsu check output from ovineko/ovineko — a TypeScript monorepo. Cold start downloads and verifies all tools. Subsequent runs use cached binaries.

Pay once. Inherit everywhere.

1

Describe your environment

Write JavaScript config with tools, runtimes, and rules. As flexible as you need — conditions, inheritance, composition.

2

Distribute as a package

Share via npm, gem, or pypi. Versioned, cacheable, reproducible. No manual copying, no "how did I configure this last time".

3

Update in one place

Change once, every dependent project moves forward together. No lost weeks before the first line of code. No configuration drift across teams.

A foundation, not a boilerplate

No Opinions, Just Foundation

Stable, verifiable, reproducible core. You bring the opinions. datamitsu ensures they travel with you.

Config as Code

JavaScript-powered configuration with chaining and inheritance. Build once, distribute everywhere via npm, gem, or pypi.

Multi-Runtime Support

Manage binaries, Python (UV), Node.js (FNM), and JVM tools in isolated environments with reproducible installs.

Security First

Every binary verified with SHA-256. No bypassing. No exceptions. Hash verification is mandatory for all downloads.

Data — configuration, everything needed for your environment to work.
Mitsu — honey (蜜) and light (光) in Japanese.

Sweetness from configuration no longer being pain.
Clarity from everything being in its place.

Your toolchain deserves a home

Not a boilerplate, not scattered across projects, not reinvented from scratch every time. datamitsu gives it one — versioned, composable, and always one command away.

Get StartedRead the Docs