jsesc
                                Given some data, jsesc returns the shortest possible stringified & ASCII-safe representation of that data.
                            
                        How to download and setup jsesc
Open terminal and run command
                                            git clone https://github.com/mathiasbynens/jsesc.git
                                        
                                        git clone is used to create a copy or clone of jsesc 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 jsesc https://github.com/mathiasbynens/jsesc/archive/master.zip
Or simply clone jsesc with SSH
                                            [email protected]:mathiasbynens/jsesc.git                                    
                                    If you have some problems with jsesc
You may open issue on jsesc support forum (system) here: https://github.com/mathiasbynens/jsesc/issuesSimilar to jsesc repositories
Here you may see jsesc alternatives and analogs
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