tree-sitter-wasm

Prebuilt WASM binaries and query files(.scm) for tree-sitter's language parsers that work with Node and bundlers like Vite. You can find a list of supported languages here

Table of Contents

• Installation
• Usage
• Security
  • Build Security
  • Cryptography
  • Verifications of binaries
    • Verifying the entire archive (GitHub CLI)
    • Verifying individual files (Cosign)
• Licenses

Installation

pnpm add tree-sitter-wasm
# or
bun install tree-sitter-wasm

Usage

A type-safe API is provided for accessing grammars and queries at runtime

import { getAvailableQueries, getWasmPath, getQueryPath } from "tree-sitter-wasm";

const wasmPath = getWasmPath("python");
const queryPath = getQueryPath("python", "highlights");
const pythonQueries = getAvailableQueries("python");

You can also import the assets directly via your bundler

import wasmUrl from "tree-sitter-wasm/python/tree-sitter-python.wasm?url";
import wasmHighlights from "tree-sitter-wasm/python/highlights.scm?raw";

// This JSON object acts as table of content for all available languages
// and their queries.
import manifest from "tree-sitter-wasm/manifest.json"

Each language directory includes a tree-sitter-<lang>.wasm file but may also include:

• highlights.scm
• injections.scm
• locals.scm
• tags.scm
• folds.scm
• indents.scm

Certain languages also contain special queries like: nova-symbols, please refer to the manifest.json or to the out dir in unpkg.

python/
├── tree-sitter-python.wasm
├── tree-sitter-python.wasm.sigstore.json
├── folds.scm
├── highlights.scm
├── indents.scm
├── injections.scm
├── locals.scm
└── tags.scm

Security

This project takes security seriously (a lot more so than other sources), all WASMs are compiled and distributed through Github actions with strict guardrails to prevent malicious code injection and tampered artifacts. You can read about wasm security features here

Build Security

• Pinned Dependencies: All upstream grammar repositories are pinned to explicit, immutable git commit hashes.
• Delayed Updates: A parser is only updated after at least 7 days have passed from the date of commit.
• Manual Review: Before any commit is bumped, the diffs are manually checked by me and run on a VM.
• Isolated CI: All binaries are compiled strictly within ephemeral, isolated Github action runner.

Cryptography

• Cosign Signing: All compiled .wasm blobs are individually cryptographically signed using cosign.
• Github Provenance: All artifacts published to npm are done with provenance.
• SLSA 3: Releases are published with SLSA level 3.

Verifications of binaries

To verify the integrity of a .wasm file fetched from this package, you can verify its signature against the Github workflow.

Verifying the entire archive (GitHub CLI)

If you downloaded the release tarball, you can verify its SLSA provenance attestation:

gh attestation verify build.tar.gz -R Crysthamus/tree-sitter-wasm

Verifying individual files (Cosign)

Every .wasm file is distributed alongside a .sigstore.json bundle containing its signature and certificate. You can verify individual files locally like this:

cosign verify-blob \
  --bundle path/to/tree-sitter-python.wasm.sigstore.json \
  --certificate-identity-regexp "^https://github.com/Crysthamus/tree-sitter-wasm/\.github/workflows/publish\.yaml@" \
  --certificate-oidc-issuer "https://token.actions.githubusercontent.com" \
  path/to/tree-sitter-python.wasm

Licenses

The licenses for the generated .wasm and .scm files belong to their respective upstream grammar authors and can be found on their Github repos.

The code in this repository is licensed under MIT. If you maintain an upstream grammar and have a problem with this licensing, please open an issue.