Vue.prototype.$mount = function()

in assets/views/vue.js [10861:10927]
58 lines of code
20 McCabe index (conditional complexity)

Vue.prototype.$mount = function (
  el,
  hydrating
) {
  el = el && query(el);

  /* istanbul ignore if */
  if (el === document.body || el === document.documentElement) {
    "development" !== 'production' && warn(
      "Do not mount Vue to <html> or <body> - mount to normal elements instead."
    );
    return this
  }

  var options = this.$options;
  // resolve template/el and convert to render function
  if (!options.render) {
    var template = options.template;
    if (template) {
      if (typeof template === 'string') {
        if (template.charAt(0) === '#') {
          template = idToTemplate(template);
          /* istanbul ignore if */
          if ("development" !== 'production' && !template) {
            warn(
              ("Template element not found or is empty: " + (options.template)),
              this
            );
          }
        }
      } else if (template.nodeType) {
        template = template.innerHTML;
      } else {
        {
          warn('invalid template option:' + template, this);
        }
        return this
      }
    } else if (el) {
      template = getOuterHTML(el);
    }
    if (template) {
      /* istanbul ignore if */
      if ("development" !== 'production' && config.performance && mark) {
        mark('compile');
      }

      var ref = compileToFunctions(template, {
        shouldDecodeNewlines: shouldDecodeNewlines,
        shouldDecodeNewlinesForHref: shouldDecodeNewlinesForHref,
        delimiters: options.delimiters,
        comments: options.comments
      }, this);
      var render = ref.render;
      var staticRenderFns = ref.staticRenderFns;
      options.render = render;
      options.staticRenderFns = staticRenderFns;

      /* istanbul ignore if */
      if ("development" !== 'production' && config.performance && mark) {
        mark('compile end');
        measure(("vue " + (this._name) + " compile"), 'compile', 'compile end');
      }
    }
  }
  return mount.call(this, el, hydrating)
};