angularjs - migration from grunt-autoprefixer to grunt-postcss -

as long grunt-autoprefixer deprecated want migrate grunt-postcss.

i m quite new in grunt world (and dependencies) not find needed in documentation migration.

to process need 3 steps:

1- uninstall grunt-autoprefixer

i suppose i've run npm uninstall grunt-autoprefixer --save-dev first

2- install grunt-postcss

then npm install grunt-postcss --save-dev

but not sure @ if i've npm install grunt-postcss pixrem autoprefixer-core cssnano

3- update config

then should modify gruntfile.js. i've section:

autoprefixer: {   options: {     browsers: ['last 1 version']   },   dist: {     files: [{       expand: true,       cwd: '.tmp/styles/',       src: '{,*/}*.css',       dest: '.tmp/styles/'     }]   } }, 

my questions:

1. can confirm uninstall / install part?
2. how migrate config?

wrote migration guide , migrate in future, please refer:

https://github.com/ndmitry/grunt-postcss#how-to-migrate-from-grunt-autoprefixer