Is it possible to print a string from C++ with Javascript using emscripten?

How can I pass a char* or std::string into an externally defined Javascript function using emscripten?

Currently, when I pass a char* into my externally defined Javascript, a number is printed instead of the string (pointers?).

Here is the code I am using:

mylib.js

mergeInto(LibraryManager.library, {  
    my_js: function(s) {  
        Module.print(s);
        console.log(s);
        document.getElementById('voronoi').innerHTML = s;
    },
 });

main.cpp

int main(int argc, const char * argv[])
{
    char* myString = (char*) malloc(10);
    strncpy(myString, "SOMETHING", 10);
    my_js(myString);
    free(myString);
    return 0;
}

Result printed to the console when running node ./a.out.js:

5260128