b.ts(3,5): error TS2540: Cannot assign to 'a' because it is a read-only property.


==== a.ts (0 errors) ====
    const foo = {
      a: 1
    }
    
    export default foo as Readonly<typeof foo>
    
==== b.ts (1 errors) ====
    import foo from './a'
    
    foo.a = 2
        ~
!!! error TS2540: Cannot assign to 'a' because it is a read-only property.
    