[add] libcalls

test_src/index.mjs

@@ -1,5 +1,12 @@
-import {readFile} from 'node:fs'
+import fs,{readFile} from 'node:fs'
+
+import classnames from 'classnames'
+// import {neq} from 'semver'
+import {sum, div,sad} from './arithmetic.cjs';
 
 readFile('a',(err)=>{
     if(err){return;}
-})
+})
+console.log(classnames('a', 'b', 'c',{a:5})); // $ExpectType string
+console.log(sum(2, 3)); 
+// console.log(neq('1.0.0', '1.0.1')); // $ExpectType boolean