things.js

// Original
i18n = Array.from(allDeps).reduce(function(p,c){
    if (c.slice(0, 'template!'.length) === 'template!') {
        return true;
    }
    return p;
}, false)

// Array#reduce and String#startsWith
i18n = Array.from(allDeps).reduce(function(p,c){
    if (c.startsWith('template!')) {
        return true;
    }
    return p;
}, false)

// Array#every
i18n = !Array.from(allDeps).every(function (dep) {
  return !dep.startsWith('template!');
}); // double negative, which is awkward

// Array#some
i18n = Array.from(allDeps).some(function (dep) {
  return dep.startsWith('template!');
});