function genHistoryApiFallbackRewrites (baseUrl, pages = {}) {
  const path = require('path')
  const multiPageRewrites = Object
    .keys(pages)
    // sort by length in reversed order to avoid overrides
    // eg. 'page11' should appear in front of 'page1'
    .sort((a, b) => b.length - a.length)
    .map(name => ({
      from: new RegExp(`^/${name}`),
      to: path.posix.join(baseUrl, pages[name].filename || `${name}.html`)
    }))
  return [
    ...multiPageRewrites,
    { from: /./, to: path.posix.join(baseUrl, 'index.html') }
  ]
}