router.scrollBehavior.js

export default function (to, from, savedPosition) {
  const nuxt = window["<%= globals.nuxt %>"];

  if (to.path === from.path) {
    return;
  }
  if (to.hash) {
    return new Promise((resolve, reject) => {
      setTimeout(() => {
        resolve({
          selector: to.hash,
        });
      }, 500);
    });
  }

  const position = savedPosition || { x: 0, y: 0 };
  return new Promise((resolve, reject) => {
    nuxt.$root.$once("triggerScroll", () => {
      nuxt.$nextTick(() => {
        resolve(position);
      });
    });
  });
}