Support matrix

16 languages. 45 frameworks. Honest precision.

Every language declares how its reference graph is built, and confidence is capped accordingly. A finding in Java can never look as certain as one in Python, because it is not. Run deadpath languages for the live table.

Tier 1 · AST

Python. Full syntax tree: exports, private defs, decorators, base classes, string literals, __all__, __main__ guards, dynamic imports, attribute access on imported modules.

Tier 2 · Import graph

TypeScript and JavaScript, including .vue and .svelte. Import specifiers resolve via relative paths, tsconfig paths aliases, and baseUrl. Named exports, @decorators, and package.json dependencies are scored the same way as Python.

Tier 3 · Reference graph

Fourteen languages. Each declares how a file is identified (import path, module name, declared types) and what it references. Precision is path or name. All four finding kinds run: orphan files, unused exports, unused manifest dependencies, and private unreachable names.

The matrix

Language	Tier	Precision	Detects	Frameworks recognised	Validation commands in workflow
Python	AST	path	orphan_file · unused_export · unused_dep · unreachable	Django, Flask, FastAPI/Starlette, pytest, Celery, SQLAlchemy/Alembic, Click/Typer, Airflow, Pydantic	`python -c "import …"` · mypy / pyright · pytest
TypeScript / JavaScript	import graph	path	orphan_file · unused_export · unused_dep · unreachable	Next.js, React, Vue, Nuxt, Angular, Svelte/SvelteKit, Remix/React Router, Astro, Vite, Express/Koa/Fastify/Hono, NestJS, Electron, Jest/Vitest, Playwright/Cypress	`npx tsc --noEmit` · vitest / jest / npm test
Go	reference graph	path	orphan_file · unused_export · unused_dep · unreachable	Gin, Echo, Fiber, Gorilla, Chi, Cobra, urfave/cli	`go build ./...` · `go vet ./...` · `go test ./...`
Rust	reference graph	path	orphan_file · unused_export · unused_dep · unreachable	Actix, Axum, Rocket, Warp, Tokio, Clap	`cargo check --all-targets` · `cargo test`
Java	reference graph	name	orphan_file · unused_export · unused_dep · unreachable	Spring, Quarkus, Micronaut, JUnit/TestNG	mvn compile/test · `./gradlew test`
Kotlin	reference graph	name	orphan_file · unused_export · unused_dep · unreachable	Ktor, Android, Spring, Quarkus, Micronaut, JUnit	`./gradlew build` · `./gradlew test`
Scala	reference graph	name	orphan_file · unused_export · unused_dep · unreachable	Spring, Quarkus, Micronaut, JUnit (sbt projects)	`sbt compile` · `sbt test`
C#	reference graph	name	orphan_file · unused_export · unused_dep · unreachable	ASP.NET Core, xUnit/NUnit/MSTest	`dotnet build` · `dotnet test`
Ruby	reference graph	path	orphan_file · unused_export · unused_dep · unreachable	Rails, Sinatra, RSpec/Minitest	rubocop · rspec / rake test
PHP	reference graph	name	orphan_file · unused_export · unused_dep · unreachable	Laravel, Symfony	`composer validate` · phpunit
Swift	reference graph	name	orphan_file · unused_export · unused_dep · unreachable	SwiftUI/UIKit, Vapor	`swift build` · `swift test`
Dart	reference graph	path	orphan_file · unused_export · unused_dep · unreachable	Flutter	`dart analyze` · flutter test / dart test
Elixir	reference graph	name	orphan_file · unused_export · unused_dep · unreachable	Phoenix	`mix compile --warnings-as-errors` · `mix test`
C / C++	reference graph	path	orphan_file · unused_export · unused_dep · unreachable	CMake / Make / Meson / vcpkg projects	`cmake --build build` · ctest
Lua	reference graph	path	orphan_file · unused_export · unused_dep · unreachable	rockspec, Neovim plugin layouts	luacheck · busted
Perl	reference graph	path	orphan_file · unused_export · unused_dep · unreachable	cpanfile / Makefile.PL	`perl -c` · `prove -l t`

What precision means for confidence

path

Imports resolve to files

Go import paths via go.mod, Rust mod/use crate::, Dart package: URIs, Ruby require_relative, C #include "…", Lua require, Perl use. A missing edge is strong evidence. Signal <lang>_path_resolved_graph −0.03; orphan files can reach block (0.89).

name

References are tokens

Java/Kotlin/Scala imports plus same-package type names, C# and Swift declared types, PHP namespaces, Elixir modules. Reflection, DI containers and code generation can hide edges. Signal <lang>_name_reference_graph −0.30; orphan files top out at warn (0.62) and always get a verify step.

Framework detection

Frameworks are detected two ways and unioned: import statements in source files, and dependency names in manifests — package.json, pyproject.toml, requirements.txt, go.mod, Cargo.toml, pom.xml, build.gradle(.kts), *.csproj, Gemfile, composer.json, Package.swift, pubspec.yaml, mix.exs, build.sbt. Each framework contributes:

Entry files and directories that are loaded by convention (Django urls.py, Next.js app/, Rails app/, Spring controller/, Laravel routes/…). These are never reported as orphans.
Registration decorators / annotations (@app.get, @receiver, @Component, @Composable, @HttpGet…) that lower export confidence by 0.60.
Framework base classes (models.Model, ApplicationRecord, ControllerBase, StatelessWidget…) that lower it by 0.35.

Monorepos

Workspaces from package.json, pnpm-workspace.yaml, Nx/Turbo/Lerna, Cargo [workspace], go.work, and nested manifests set profile.monorepo. The graph is built per repository root; scan a package directory for a package-local view.

Adding a language is a ~40-line entry in deadpath/polyglot.py: suffixes, an ids() function, a refs() function, an entry rule, a test rule, and validation commands. Precision must be declared.