after upgrade 3.1.0 → 4.0.0, `Module not found: Error: Can't resolve 'ejs-html-loader' in 'repository path'` ---- `node_modules/ejs-html-loader` on 3.1.0 ``` lib/ .npmignore LICENSE package.json package.lock.json README.md ``` on 4.0.0 ``` node_modules/ LICENSE package.json README.md ``` package.json `"main": "lib/index.js"` is missing on 4.0.0.