Loads all `.js` sources requested by the current suite.
function loadJsSuites(_reporter, done) {
    debug('loadJsSuites', jsSuites$1);
    var loaders = jsSuites$1.map(function (file) {
        // We only support `.js` dependencies for now.
        return loadScript.bind(util, file);
    });
    parallel(loaders, done);
}