post-build-6.js

var fs = require('fs');
var mv = require('mv');
var dirs = ['app/.next/_next', 'app/.next/_next/build', 'app/.next/_next/build/page', 'app/.next/_next/static'];

const PAGE_PATH = {
  old: 'app/.next/bundles/pages',
  new: 'app/.next/_next/build/page'
};

const STATIC_PATH = {
  old: 'app/.next/static',
  new: 'app/.next/_next/static'
};

// create dir
dirs.forEach(item => {
  fs.mkdirSync(item);
});

// move files
mv(PAGE_PATH.old, PAGE_PATH.new, { mkdirp: true }, function(err) {
  if (err) console.log(err);
});

mv(STATIC_PATH.old, STATIC_PATH.new, { mkdirp: true }, function(err) {
  if (err) console.log(err);
});

post-build-7.js

var fs = require('fs');
var mv = require('mv');
var dirs = [
  'app/.next/_next',
  'app/.next/_next/static',
];

const STATIC_PATH = {
  old: 'app/.next/static',
  new: 'app/.next/_next/static'
};

// create dir
dirs.forEach(item => {
  fs.mkdirSync(item);
});

mv(STATIC_PATH.old, STATIC_PATH.new, { mkdirp: true }, function(err) {
  if (err) console.log(err);
});

post-build-8.js

var fs = require('fs');
var mv = require('mv');

var dirs = ['.next/_next', '.next/_next/static'];

const STATIC_PATH = {
  old: '.next/static',
  new: '.next/_next/static'
};

// create dir
dirs.forEach(item => {
  fs.mkdirSync(item);
});

mv(STATIC_PATH.old, STATIC_PATH.new, { mkdirp: true }, function(err) {
  if (err) console.log(err);
});