In TypeScript playground, a function to write directly to the window, rather than just debugger console.

scribble.ts

/**
* Write the given message in a PRE element of the document.
*/
function scribble(aMsg: string): void {
    console.log(aMsg);
    // Get a reference to the document's PRE element, or null if there isn't one.
    var preElt = document.body.querySelector("pre");
    if (preElt) {
        // Do nothing, we're good
        // console.log("got preElt");
    }
    else {
        // console.log('make new pre elt');
        preElt = document.createElement("pre");
        // console.log('append pre elt to document body');
        document.body.appendChild(preElt);
    }
    // console.log('append new Text to pre elt');
    preElt.appendChild(new Text(aMsg + '\n'));
}