Lett da

helloworld.lett

my.test-lib: {
    a: 'hello', 
    b: 'world', 
    c: 1337, 
    t: true, 
    f: false,
    inner.object: 'Works!',
    my.very-inner.object: 7,
    nesting-test: +(1 2 3 -(6 1)),
    string-test: str('hello' ', ' 'world'),
    test-fn.add[a b]: +(a b),
    test-add: my.test-lib.test-fn.add(30 12)
}

output

my {
   test-lib: {
       a: 'hello', 
       b: 'world', 
       c: 1337, 
       t: true, 
       f: false,
       inner {
           object: 'Works!'
       },
       my {
           very-inner {
               object: 7
           }
       },
       nesting-test: 11,
       string-test: 'hello, world',
       test-fn.add[a b]: [Function],
       test-add: 42
    }
}