packages/@vue/babel-preset-app/polyfillsPlugin.js
function getModulePath (mod, useAbsolutePath) {
  const modPath =
    mod === 'regenerator-runtime'
      ? 'regenerator-runtime/runtime'
      : `core-js/modules/${mod}`
  return useAbsolutePath ? require.resolve(modPath) : modPath
}
function getModulePath (mod, useAbsolutePath) {
  const modPath =
    mod === 'regenerator-runtime'
      ? 'regenerator-runtime/runtime'
      : `core-js/modules/${mod}`
  return useAbsolutePath ? require.resolve(modPath) : modPath
}
function getModulePath ( mod , useAbsolutePath ) { const modPath = mod === 'regenerator-runtime' ? 'regenerator-runtime/runtime' : ` ${ mod } ` return useAbsolutePath ? require . resolve ( modPath ) : modPath }
slightly modifiled from @babel/preset-env/src/utils use an absolute path for core-js modules, to fix conflicts of different core-js versions
slightly modifiled from