hearth-graph

hearth-graph is a standalone Rust library for tree-sitter symbol extraction, incremental symbol indexing, import analysis, and module-graph queries. It has no global engine state and does not require Hearth's cache or transport crates. Hosts own the language registry, source loading, cancellation, and concurrency policy.

Capabilities

• injectable LanguageRegistry with an optional bundled grammar set
• one-pass symbol and import analysis over tree-sitter parse trees
• incremental SymbolIndex search and definition lookup
• incremental ModuleGraph dependency, reverse-dependency, and neighborhood queries with Exact or Approximate guarantees
• JavaScript/TypeScript resolution through oxc_resolver
• best-effort Rust module resolution
• cancellation-aware parallel index construction through a host-provided SourceLoader

Quick start

use hearth_graph::{LanguageRegistry, ParserPool, extract_symbols};

let registry = LanguageRegistry::bundled();
let mut parsers = ParserPool::new(&registry);
let symbols = extract_symbols(
    "fn main() { println!(\"hello\"); }\n",
    "src/main.rs",
    &mut parsers,
);

assert!(symbols.iter().any(|symbol| symbol.name == "main"));

The default feature set includes the bundled languages, filesystem loader, and both resolver implementations. A host can disable defaults and inject its own grammar:

use hearth_graph::{LanguageRegistry, LanguageSpec};

# fn register(language: tree_sitter::Language) {
let mut registry = LanguageRegistry::empty();
registry.register(
    LanguageSpec::new("custom", language, ["custom"])
        .with_tags_query("(function_definition name: (identifier) @name) @definition.function"),
);
# }

Features

resolve-rust deliberately reports partial completeness. Exact Rust resolution requires Cargo target metadata and a module declaration tree that can model cfg, #[path], macros, and inline modules.

Versioning and MSRV

The minimum supported Rust version is 1.95. The crate is currently in the 0.1 series; public APIs may evolve between minor releases. Pin an exact version when integrating a compatibility facade.

The detailed cache adapter, freshness model, and graph guarantees used by the Hearth tools are documented in the Hearth architecture guide.

License

MIT