Fix prefer-const related issues

Author: aryaemami59

packages/toolkit/.size-limit.cjs

@@ -1,5 +1,5 @@
 const webpack = require('webpack')
-let { join } = require('path')
+const { join } = require('path')
 
 const esmSuffixes = ['modern.mjs' /*, 'browser.mjs', 'legacy-esm.js'*/]
 const cjsSuffixes = [/*'development.cjs',*/ 'production.min.cjs']