---
title: Language support
description: SigMap extracts signatures from 31 programming languages and formats. Pure regex, zero Tree-sitter, no binary dependencies. TypeScript, Python, Go, Rust, Java, R, GraphQL, SQL, Terraform, and more.
head:
  - - meta
    - property: og:title
      content: "SigMap Language Support — 31 languages, zero Tree-sitter"
  - - meta
    - property: og:description
      content: "Pure regex AST extraction for 31 languages and formats. No compiler required, no binary dependencies."
  - - meta
    - property: og:url
      content: "https://manojmallick.github.io/sigmap/guide/languages"
  - - meta
    - property: og:type
      content: article
  - - meta
    - name: keywords
      content: "sigmap languages, typescript signatures, python signatures, go signatures, rust signatures, graphql signatures, sql signatures, terraform signatures, ai context extraction"
---
# Language support

SigMap extracts signatures from 31 programming languages and formats using pure regex — no Tree-sitter, no native binaries. Every extractor is a single JS file. No grammar files to download. Runs deterministically on any machine with Node.js 18+.

**Stats:** 31 languages · 25 max signatures per file · 0 npm packages · 400+ passing tests across unit and integration suites

## How extraction works

Full source code goes in. Only public shapes come out. Bodies, comments, imports, and private members are stripped entirely.

**TypeScript example — input (1,240 tokens):**

```typescript
export interface User {
  id: string;
  email: string;
  createdAt: Date;
}

export class UserService {
  private db: Database;

  async findById(id: string): Promise<User> {
    // implementation...
  }

  async create(dto: CreateDto): Promise<User> { ... }

  private _validate(d: any) { ... }
}
```

**Output (62 tokens) — 95% reduction:**

```
export interface User
export class UserService
  async findById(id: string): Promise<User>
  async create(dto: CreateDto): Promise<User>

# private _validate stripped
# bodies stripped
# comments stripped
```

## What's extracted — and what isn't

### Extracted

- Exported / public classes with public methods
- Exported / public functions and procedures
- Exported types, interfaces, and enums
- Internal classes (unexported, lower priority)
- Internal functions (unexported, lower priority)
- Method signatures — name, parameters, return type
- Generic type parameters and constraints
- Async / await marker where language supports it

### Never extracted

- Function and method bodies (everything inside `{}`)
- Comments — `//`, `/*`, `#`, `"""`, `'''` in all languages
- Import and require statements
- Variable declarations that aren't type definitions
- Private class members (`_prefix`, `#` prefix, `private` keyword)
- Test files (`*.test.*`, `*.spec.*`, `*_test.*`)
- Generated files (`*.pb.*`, `*.generated.*`)
- Any credential, key, token, or secret pattern

## All 31 languages

| Language | Extensions | Extracts |
|----------|------------|----------|
| TypeScript | `.ts` `.tsx` | export function, export class, interface, type alias, enum, methods, generics |
| JavaScript | `.js` `.jsx` `.mjs` `.cjs` | export function, export class, arrow functions, module.exports, methods |
| Python | `.py` `.pyw` | def functions, class, methods, async def, @dataclass, @property |
| Java | `.java` | public class, interface, enum, public methods, annotations |
| Kotlin | `.kt` `.kts` | fun, class, data class, interface, object, sealed class |
| Go | `.go` | func, type struct, interface, method receivers, type alias |
| Rust | `.rs` | pub fn, pub struct, trait, enum, impl methods, pub type |
| C# | `.cs` | public class, interface, enum, public methods, record, struct |
| C / C++ | `.c` `.cpp` `.h` `.hpp` `.cc` | functions, class / struct, public methods, template, typedef |
| Ruby | `.rb` `.rake` | def, class, module, attr_accessor, include / extend |
| PHP | `.php` | function, class, interface, trait, public methods |
| Swift | `.swift` | func, class / struct, protocol, enum, extension |
| Dart | `.dart` | class, void / return type functions, abstract class, mixin, methods |
| Scala | `.scala` `.sc` | def, class, object, trait, case class, methods |
| Vue | `.vue` | defineProps, defineEmits, composables, component name, script functions |
| Svelte | `.svelte` | export let props, export function, script functions, component name |
| HTML | `.html` `.htm` | page title, h1–h3 headings, form id/action, script src, link rel |
| CSS / SCSS / LESS | `.css` `.scss` `.sass` `.less` | CSS variables (--), @mixin, @function, media queries, top-level selectors |
| YAML | `.yml` `.yaml` | top-level keys, CI job names, K8s kind/name, second-level keys |
| Shell | `.sh` `.bash` `.zsh` `.fish` | function names, exported vars, script description |
| Dockerfile | `Dockerfile` `Dockerfile.*` | FROM image, EXPOSE ports, ENTRYPOINT, multi-stage names, ARG / ENV keys |
| GraphQL | `.graphql` `.gql` | type, interface, input, enum, union, scalar, extend type, query / mutation |
| SQL | `.sql` | CREATE TABLE, VIEW, FUNCTION, PROCEDURE, INDEX, TRIGGER, CREATE TYPE |
| Terraform | `.tf` `.tfvars` | resource, data, module, variable, output, provider, locals |
| Protocol Buffers | `.proto` | message, enum, service, rpc, syntax, package |
| R | `.R` `.r` | function, S4 class / method, R6 class, S7 class, roxygen hints |
| TOML | `.toml` | top-level tables (`[table]`), arrays of tables (`[[array]]`), key groups |
| Properties | `.properties` | dotted-key namespaces, prefix groups (spring.*, db.*, server.*) |
| XML | `.xml` | root element, bean/route/kind, top-level named elements, Spring beans |
| Markdown | `.md` | h1–h3 headings, code-fence languages, link titles |
| GDScript | `.gd` | class definition, extends, signal, enum, constant, function definition |

## Extraction quality tiers

### Mature

TypeScript, JavaScript, Python, Go, Rust, Java, Kotlin, Ruby, PHP, Swift, C#, C++, Dart, Scala.

These extractors cover the public shapes most developers care about day to day and are the most proven in the benchmark set.

### Stable

Vue, Svelte, GraphQL, SQL, Terraform, Protobuf, YAML, Shell, Dockerfile, TOML, XML, Properties, Markdown, R, GDScript.

These are reliable for structure-first context, but some ecosystems have more variation in how teams write files.

### Fallback or shape-level

HTML and CSS-family files are intentionally shallower. They capture the top-level structure that helps navigation, not full semantic behavior.

## Contributing a new language

Adding a language means contributing one extractor file. Follow the extractor contract, ensure all tests pass, and open a PR. See [CONTRIBUTING.md](https://github.com/manojmallick/sigmap/blob/main/CONTRIBUTING.md) for the full guide.


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