Snippet: Simulating Escape Key for Unit Tests in JS

Just a little code snippet I had to work to get right: simulating an escape key on the document element:

function hitEscapeKey() {
// Browser bug: can't use keyboard events, so we do it this way.
// See
const escapeKey = document.createEvent("Events");
escapeKey.initEvent("keydown", true, true);
escapeKey.keyCode = 27;
escapeKey.which = 27;
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