I am posting it with the reference to paulpflug/vue-mixins#2

[Vue warn]: Error when rendering root instance:
ReferenceError: document is not defined
at VueComponent.updateScroll (/Users/sobolev/Documents/Frontends/razgrebaem/node_modules/vue-overlay/overlay-component.js:96:19)
at VueComponent.boundFn as updateScroll
at VueComponent.lastItem (/Users/sobolev/Documents/Frontends/razgrebaem/node_modules/vue-overlay/overlay-component.js:40:12)
at Watcher.get (/Users/sobolev/Documents/Frontends/razgrebaem/node_modules/vue/dist/vue.common.js:736:27)
at Watcher.evaluate (/Users/sobolev/Documents/Frontends/razgrebaem/node_modules/vue/dist/vue.common.js:844:21)
at VueComponent.computedGetter as lastItem
at VueComponent.zIndex (/Users/sobolev/Documents/Frontends/razgrebaem/node_modules/vue-overlay/overlay-component.js:6:15)
at Watcher.get (/Users/sobolev/Documents/Frontends/razgrebaem/node_modules/vue/dist/vue.common.js:736:27)
at Watcher.evaluate (/Users/sobolev/Documents/Frontends/razgrebaem/node_modules/vue/dist/vue.common.js:844:21)
at Proxy.computedGetter (/Users/sobolev/Documents/Frontends/razgrebaem/node_modules/vue/dist/vue.common.js:1307:15)