build-wasm.ts

#!/usr/bin/env node

/**
 * Build WASM grammar files from tree-sitter grammar packages.
 *
 * Usage: node scripts/build-wasm.js
 *
 * Requires devDependencies: tree-sitter-cli + grammar packages.
 * Outputs .wasm files into grammars/ (committed to repo).
 */

import { execFileSync } from 'child_process';
import { mkdirSync, existsSync } from 'fs';
import { resolve, dirname } from 'path';
import { fileURLToPath } from 'url';
import { createRequire } from 'module';

const require = createRequire(import.meta.url);
const __dirname = dirname(fileURLToPath(import.meta.url));
const root = resolve(__dirname, '..');
const grammarsDir = resolve(root, 'grammars');

if (!existsSync(grammarsDir)) mkdirSync(grammarsDir);

const grammars = [
  { name: 'tree-sitter-javascript', pkg: 'tree-sitter-javascript', sub: null },
  { name: 'tree-sitter-typescript', pkg: 'tree-sitter-typescript', sub: 'typescript' },
  { name: 'tree-sitter-tsx', pkg: 'tree-sitter-typescript', sub: 'tsx' },
  { name: 'tree-sitter-python', pkg: 'tree-sitter-python', sub: null },
  { name: 'tree-sitter-hcl', pkg: '@tree-sitter-grammars/tree-sitter-hcl', sub: null },
  { name: 'tree-sitter-go', pkg: 'tree-sitter-go', sub: null },
  { name: 'tree-sitter-rust', pkg: 'tree-sitter-rust', sub: null },
  { name: 'tree-sitter-java', pkg: 'tree-sitter-java', sub: null },
  { name: 'tree-sitter-c-sharp', pkg: 'tree-sitter-c-sharp', sub: null },
  { name: 'tree-sitter-ruby', pkg: 'tree-sitter-ruby', sub: null },
  { name: 'tree-sitter-php', pkg: 'tree-sitter-php', sub: 'php' },
];

for (const g of grammars) {
  const pkgDir = dirname(require.resolve(`${g.pkg}/package.json`));
  const grammarDir = g.sub ? resolve(pkgDir, g.sub) : pkgDir;

  console.log(`Building ${g.name}.wasm from ${grammarDir}...`);
  execFileSync('npx', ['tree-sitter', 'build', '--wasm', grammarDir], {
    cwd: grammarsDir,
    stdio: 'inherit',
    shell: true,
  });
  console.log(`  Done: ${g.name}.wasm`);
}

console.log('\nAll grammars built successfully into grammars/');