Configuration Overview

Place mille.toml in your project root to configure mille.

File Structure

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

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

# ... additional layers

[severity]
dependency_violation = "error"

[ignore]
paths = ["**/generated/**"]

Sections

Section	Description
`[project]`	Project name, root, and target languages
`[[layers]]`	Layer definitions and dependency rules
`[resolve.*]`	Language-specific import resolution
`[severity]`	Violation severity settings
`[ignore]`	Paths to exclude from analysis

`[project]`

Key	Description
`name`	Project name
`root`	Root directory for analysis (relative to `mille.toml`)
`languages`	Languages to check: `"rust"` / `"go"` / `"typescript"` / `"javascript"` / `"python"` / `"java"` / `"kotlin"`

`[ignore]`

Key	Description
`paths`	Glob patterns to fully exclude (generated code, vendor dirs, mocks)
`test_patterns`	Patterns for files counted in layer stats but not violation-checked (test files)

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

paths vs test_patterns:

paths: Files to exclude entirely from analysis
test_patterns: Test files that intentionally import across layers (e.g., integration tests)