=====
>>> main.whiley
import string from js::core

public export method test():
    string s1 = "hello"
    assert s1[0] == 'h'
    // assert s1[1] == 'e'
    // assert s1[2] == 'l'
    // assert s1[3] == 'l'
    // assert s1[4] == 'o'
    // assert |s1| == 5
>>> js/core.whiley
package js

public type string is int[] where true
---