Function rewriteTsImportsInDir

tsup.config.ts:10–29

* Recursively rewrites .ts imports to .js in all JavaScript files. * Required because Node.js cannot resolve .ts extensions at runtime.

(dir: string)

 * Required because Node.js cannot resolve .ts extensions at runtime.
 */
function rewriteTsImportsInDir(dir: string): void {
  const entries = readdirSync(dir, { withFileTypes: true });
  for (const entry of entries) {
    const fullPath = join(dir, entry.name);
    if (entry.isDirectory()) {
      rewriteTsImportsInDir(fullPath);
    } else if (entry.name.endsWith('.js')) {
      let content = readFileSync(fullPath, 'utf-8');
      // Rewrite: import ... from "./path.ts" or import ... from "../path.ts"
      // Also handles: export ... from "./path.ts"
      const rewritten = content.replace(
        /((?:import|export)[^'"]*['"])([^'"]+)(\.ts)(['"])/g,
        '$1$2.js$4',
      );
      if (rewritten !== content) {
        writeFileSync(fullPath, rewritten, 'utf-8');
      }
    }
  }
}

export default defineConfig({
  // Include all TypeScript files for unbundled output