Function loadGrammarsForLanguages

src/extraction/grammars.ts:404–432

(languages: Language[], wasmBytes?: Record<string, Uint8Array>)

 * language's bytes are present they're loaded from memory instead of disk.
 */
export async function loadGrammarsForLanguages(languages: Language[], wasmBytes?: Record<string, Uint8Array>): Promise<void> {
  if (!parserInitialized) {
    await initGrammars();
  }

  languages = expandGrammarLanguages(languages);

  // Deduplicate and filter to languages that have WASM grammars and aren't already loaded
  const toLoad = [...new Set(languages)].filter(
    (lang): lang is GrammarLanguage =>
      lang in WASM_GRAMMAR_FILES &&
      !languageCache.has(lang) &&
      !unavailableGrammarErrors.has(lang)
  );

  // Load grammars sequentially to avoid web-tree-sitter WASM race condition on Node 20+
  // See: https://github.com/tree-sitter/tree-sitter/issues/2338
  for (const lang of toLoad) {
    try {
      const bytes = wasmBytes?.[lang];
      const language = await WasmLanguage.load(bytes ?? resolveWasmPath(lang));
      languageCache.set(lang, language);
    } catch (error) {
      const message = error instanceof Error ? error.message : String(error);
      console.warn(`[CodeGraph] Failed to load ${lang} grammar — parsing will be unavailable: ${message}`);
      unavailableGrammarErrors.set(lang, message);
    }
  }
}

/**
 * Load ALL grammar WASM files. Convenience function for tests and