How to format curly braces for autoformat in intellij

Go to settings and search for ES6 import/export braces. It should take you to Editor -> Code Style -> Javascript (or TypeScript). Just hit that checkbox on the spaces tab and it should add the spaces back.

Go to preference, select Editor > Code Style > Javascript and choose Spaces, check the checkboxes in Within section "ES6 import/export brances", and if you want spaces in object literal braces, check "Object literal braces" and as well.