fixed ts issue (#59)

Author: marcveens

rollup.config.js

@@ -1,7 +1,7 @@
 import { swc } from 'rollup-plugin-swc3';
 import { nodeResolve } from '@rollup/plugin-node-resolve';
 import del from 'rollup-plugin-delete';
-import pkg from './package.json' assert { type: 'json' };
+import pkg from './package.json' with { type: 'json' };
 
 const extensions = ['.js', '.ts', '.tsx'];
 const external = (_) => /node_modules/.test(_) && !/@swc\/helpers/.test(_);