How to download and setup serviceworker-rails
Open terminal and run command
                                            git clone https://github.com/rossta/serviceworker-rails.git
                                        
                                        git clone is used to create a copy or clone of serviceworker-rails repositories.
                                        You pass git clone a repository URL. it supports a few different network protocols and corresponding URL formats.
Also you may download zip file with serviceworker-rails https://github.com/rossta/serviceworker-rails/archive/master.zip
Or simply clone serviceworker-rails with SSH
                                            [email protected]:rossta/serviceworker-rails.git                                    
                                    If you have some problems with serviceworker-rails
You may open issue on serviceworker-rails support forum (system) here: https://github.com/rossta/serviceworker-rails/issuesSimilar to serviceworker-rails repositories
Here you may see serviceworker-rails alternatives and analogs
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