mille 0.0.11

Architecture Checker — static analysis for layered architecture rules

mille

Like a mille crêpe — your architecture, one clean layer at a time.

  ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━  presentation
  · · · · · · · · · · · · · · · · · ·  (deps only flow inward)
  ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━  infrastructure
  · · · · · · · · · · · · · · · · · ·
  ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━  usecase
  · · · · · · · · · · · · · · · · · ·
  ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━  domain

mille is a static analysis CLI that enforces dependency rules for layered architectures — Clean Architecture, Onion Architecture, Hexagonal Architecture, and more.

One TOML config. Rust-powered. CI-ready. Supports multiple languages from a single config file.

What it checks

Check	Rust	Go	TypeScript	JavaScript	Python
Layer dependency rules (dependency_mode)	✅	✅	✅	✅	✅
External library rules (external_mode)	✅	✅	✅	✅	✅
DI method call rules (allow_call_patterns)	✅	✅	✅	✅	✅

Install

cargo

cargo install mille

npm

npm install -g @makinzm/mille
mille check

Or without installing globally:

npx @makinzm/mille check

Requires Node.js ≥ 18. Bundles mille.wasm — no native compilation needed.

go install

go install github.com/makinzm/mille/packages/go/mille@latest

Embeds mille.wasm via wazero — fully self-contained binary.

pip / uv

# uv (recommended)
uv add --dev mille
uv run mille check

# pip
pip install mille
mille check

Binary download

Pre-built binaries are on GitHub Releases:

Platform	Archive
Linux x86_64	mille-<version>-x86_64-unknown-linux-gnu.tar.gz
Linux arm64	mille-<version>-aarch64-unknown-linux-gnu.tar.gz
macOS x86_64	mille-<version>-x86_64-apple-darwin.tar.gz
macOS arm64	mille-<version>-aarch64-apple-darwin.tar.gz
Windows x86_64	mille-<version>-x86_64-pc-windows-msvc.zip

Quick Start

1. Generate mille.toml with mille init

mille init

mille init analyzes actual import statements in your source files to infer layer structure and dependencies — no predetermined naming conventions needed. It prints the inferred dependency graph before writing the config:

Detected languages: rust
Scanning imports...
Using layer depth: 2

Inferred layer structure:
  domain               ← (no internal dependencies)
  usecase              → domain
    external: anyhow
  infrastructure       → domain
    external: serde, tokio

Generated 'mille.toml'

Flag	Default	Description
--output <path>	mille.toml	Write config to a custom path
--force	false	Overwrite an existing file without prompting
--depth <N>	auto	Layer detection depth from project root

--depth and auto-detection: mille init automatically finds the right layer depth by trying depths 1–6, skipping common source-layout roots (src, lib, app, etc.), and selecting the first depth that yields 2–8 candidate layers. For a project with src/domain/entity, src/domain/repository, src/usecase/ — depth 2 is chosen, rolling entity and repository up into domain. Use --depth N to override when auto-detection picks the wrong level.

The generated config includes allow (inferred internal dependencies) and external_allow (detected external packages) per layer. After generating, review the config and run mille check to see results.

Naming in monorepos: When multiple sub-projects contain a directory with the same name (e.g. crawler/src/domain and server/src/domain), mille init gives each its own layer with a distinguishing prefix (crawler_domain, server_domain). Merging is left to you.

Excluded paths: mille check automatically skips .venv, venv, node_modules, target, dist, build, and similar build/dependency directories, so generated paths patterns like apps/** are safe to use.

Python submodule imports: external_allow = ["matplotlib"] correctly allows both import matplotlib and import matplotlib.pyplot.

Go projects: mille init reads go.mod and generates [resolve.go] module_name automatically — internal module imports are classified correctly during mille check. External packages appear in external_allow with their full import paths (e.g. "github.com/cilium/ebpf", "fmt", "net/http").

TypeScript/JavaScript subpath imports: external_allow = ["vitest"] correctly allows both import "vitest" and import "vitest/config". Scoped packages (@scope/name/sub) are matched by "@scope/name".

2. (Or) Create mille.toml manually

Place mille.toml in your project root:

Rust:

[project]
name      = "my-app"
root      = "."
languages = ["rust"]

[[layers]]
name            = "domain"
paths           = ["src/domain/**"]
dependency_mode = "opt-in"
allow           = []
external_mode   = "opt-in"
external_allow  = []

[[layers]]
name            = "usecase"
paths           = ["src/usecase/**"]
dependency_mode = "opt-in"
allow           = ["domain"]
external_mode   = "opt-in"
external_allow  = []

[[layers]]
name            = "infrastructure"
paths           = ["src/infrastructure/**"]
dependency_mode = "opt-out"
deny            = []
external_mode   = "opt-out"
external_deny   = []

[[layers]]
name            = "main"
paths           = ["src/main.rs"]
dependency_mode = "opt-in"
allow           = ["domain", "infrastructure", "usecase"]
external_mode   = "opt-in"
external_allow  = ["clap"]

  [[layers.allow_call_patterns]]
  callee_layer  = "infrastructure"
  allow_methods = ["new", "build", "create", "init", "setup"]

TypeScript / JavaScript:

[project]
name      = "my-ts-app"
root      = "."
languages = ["typescript"]

[resolve.typescript]
tsconfig = "./tsconfig.json"

[[layers]]
name            = "domain"
paths           = ["domain/**"]
dependency_mode = "opt-in"
allow           = []
external_mode   = "opt-out"
external_deny   = []

[[layers]]
name            = "usecase"
paths           = ["usecase/**"]
dependency_mode = "opt-in"
allow           = ["domain"]
external_mode   = "opt-in"
external_allow  = ["zod"]

[[layers]]
name            = "infrastructure"
paths           = ["infrastructure/**"]
dependency_mode = "opt-out"
deny            = []
external_mode   = "opt-out"
external_deny   = []

Use languages = ["javascript"] for plain .js / .jsx projects (no [resolve.typescript] needed).

Go:

[project]
name      = "my-go-app"
root      = "."
languages = ["go"]

[resolve.go]
module_name = "github.com/myorg/my-go-app"

[[layers]]
name            = "domain"
paths           = ["domain/**"]
dependency_mode = "opt-in"
allow           = []

[[layers]]
name            = "usecase"
paths           = ["usecase/**"]
dependency_mode = "opt-in"
allow           = ["domain"]

[[layers]]
name            = "infrastructure"
paths           = ["infrastructure/**"]
dependency_mode = "opt-out"
deny            = []

[[layers]]
name            = "cmd"
paths           = ["cmd/**"]
dependency_mode = "opt-in"
allow           = ["domain", "usecase", "infrastructure"]

Python:

[project]
name      = "my-python-app"
root      = "."
languages = ["python"]

[resolve.python]
src_root      = "."
package_names = ["domain", "usecase", "infrastructure"]

[[layers]]
name            = "domain"
paths           = ["domain/**"]
dependency_mode = "opt-in"
allow           = []
external_mode   = "opt-out"
external_deny   = []

[[layers]]
name            = "usecase"
paths           = ["usecase/**"]
dependency_mode = "opt-in"
allow           = ["domain"]
external_mode   = "opt-out"
external_deny   = []

[[layers]]
name            = "infrastructure"
paths           = ["infrastructure/**"]
dependency_mode = "opt-out"
deny            = []
external_mode   = "opt-out"
external_deny   = []

2. Visualize with mille analyze

Before enforcing rules, you can inspect the actual dependency graph:

mille analyze                  # human-readable terminal output (default)
mille analyze --format json    # machine-readable JSON graph
mille analyze --format dot     # Graphviz DOT (pipe to: dot -Tsvg -o graph.svg)
mille analyze --format svg     # self-contained SVG image (open in a browser)

Example SVG output (dark theme, green edges):

mille analyze --format svg > graph.svg && open graph.svg

mille analyze always exits 0 — it only visualizes, never enforces rules.

3. Inspect external dependencies with mille report external

mille report external                  # human-readable table (default)
mille report external --format json    # machine-readable JSON
mille report external --output report.json --format json   # write to file

Shows which external packages each layer actually imports — useful for auditing external_allow lists or documenting your dependency footprint.

Example output:

External Dependencies by Layer

  domain          (none)
  usecase         (none)
  infrastructure  database/sql
  cmd             fmt, os

mille report external always exits 0 — it only reports, never enforces rules.

4. Run mille check

mille check

Output formats:

mille check                          # human-readable terminal output (default)
mille check --format github-actions  # GitHub Actions annotations (::error file=...)
mille check --format json            # machine-readable JSON

Fail threshold:

mille check                         # exit 1 on error-severity violations only (default)
mille check --fail-on warning       # exit 1 on any violation (error or warning)
mille check --fail-on error         # explicit default — same as no flag

Exit codes:

Code	Meaning
0	No violations (or only warnings without --fail-on warning)
1	One or more violations at the configured fail threshold
3	Configuration file error

Configuration Reference

[project]

Key	Description
name	Project name
root	Root directory for analysis
languages	Languages to check: "rust", "go", "typescript", "javascript", "python"

[[layers]]

Key	Description
name	Layer name
paths	Glob patterns for files in this layer
dependency_mode	"opt-in" (deny all except allow) or "opt-out" (allow all except deny)
allow	Allowed layers (when dependency_mode = "opt-in")
deny	Forbidden layers (when dependency_mode = "opt-out")
external_mode	"opt-in" or "opt-out" for external library usage
external_allow	Allowed external packages (when external_mode = "opt-in")
external_deny	Forbidden external packages (when external_mode = "opt-out")

[[layers.allow_call_patterns]]

Restricts which methods may be called on a given layer's types. Only valid on the main layer (or equivalent DI entrypoint).

Key	Description
callee_layer	The layer whose methods are being restricted
allow_methods	List of method names that are permitted

[ignore]

Exclude files from the architecture check entirely, or suppress violations for test/mock files.

Key	Description
paths	Glob patterns — matching files are excluded from collection and not counted in layer stats
test_patterns	Glob patterns — matching files are still counted in layer stats but their imports are not violation-checked

[ignore]
paths         = ["**/mock/**", "**/generated/**", "**/testdata/**"]
test_patterns = ["**/*_test.go", "**/*.spec.ts", "**/*.test.ts"]

When to use paths vs test_patterns:

• paths: Files that should not be analyzed at all (generated code, vendor directories, mocks)
• test_patterns: Test files that intentionally import across layers (e.g., integration tests that import both domain and infrastructure)

[severity]

Control the severity level of each violation type. Violations can be "error", "warning", or "info".

Key	Default	Description
dependency_violation	"error"	Layer dependency rule violated
external_violation	"error"	External library rule violated
call_pattern_violation	"error"	DI entrypoint method call rule violated
unknown_import	"warning"	Import that could not be classified

[severity]
dependency_violation   = "warning"   # treat as warning for gradual adoption
external_violation     = "error"
call_pattern_violation = "error"
unknown_import         = "warning"

Use --fail-on warning to exit 1 even for warnings when integrating into CI gradually.

[resolve.typescript]

Key	Description
tsconfig	Path to tsconfig.json. mille reads compilerOptions.paths and resolves path aliases (e.g. @/*) as internal imports.

How TypeScript / JavaScript imports are classified:

Import	Classification
import X from "./module"	Internal
import X from "../module"	Internal
import X from "@/module" (path alias in tsconfig.json)	Internal
import X from "react"	External
import fs from "node:fs"	External

[resolve.go]

Key	Description
module_name	Go module name (matches go.mod). mille init generates this automatically from go.mod.

[resolve.python]

Key	Description
src_root	Root directory of the Python source tree (relative to mille.toml)
package_names	Your package names — imports starting with these are classified as internal. e.g. ["domain", "usecase"]

How Python imports are classified:

Import	Classification
from .sibling import X (relative)	Internal
import domain.entity (matches package_names)	Internal
import os, import sqlalchemy	External

How it Works

mille uses tree-sitter for AST-based import extraction — no regex heuristics.

mille.toml
    │
    ▼
Layer definitions
    │
Source files (*.rs, *.go, *.py, *.ts, *.js, ...)
    │ tree-sitter parse
    ▼
RawImport list
    │ Resolver (stdlib / internal / external)
    ▼
ResolvedImport list
    │ ViolationDetector
    ▼
Violations → terminal output

Dogfooding

mille checks its own source code on every CI run:

mille check   # uses ./mille.toml

See mille.toml for the architecture rules applied to mille itself.

Documentation

• spec.md — Full specification (in Japanese)
• docs/TODO.md — Development roadmap