Vue.prototype.$mount = function()

in assets/js/vue.js [11878:11945]
59 lines of code
16 McCabe index (conditional complexity)

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

    /* istanbul ignore if */
    if (el === document.body || el === document.documentElement) {
      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 (!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 (config.performance && mark) {
          mark('compile');
        }

        var ref = compileToFunctions(template, {
          outputSourceRange: "development" !== 'production',
          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 (config.performance && mark) {
          mark('compile end');
          measure(("vue " + (this._name) + " compile"), 'compile', 'compile end');
        }
      }
    }
    return mount.call(this, el, hydrating)
  };