event-dispatcher-contracts
                                A set of event dispatcher abstractions extracted out of the Symfony components
                            
                        How to download and setup event-dispatcher-contracts
Open terminal and run command
                                            git clone https://github.com/symfony/event-dispatcher-contracts.git
                                        
                                        git clone is used to create a copy or clone of event-dispatcher-contracts 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 event-dispatcher-contracts https://github.com/symfony/event-dispatcher-contracts/archive/master.zip
Or simply clone event-dispatcher-contracts with SSH
                                            [email protected]:symfony/event-dispatcher-contracts.git                                    
                                    If you have some problems with event-dispatcher-contracts
You may open issue on event-dispatcher-contracts support forum (system) here: https://github.com/symfony/event-dispatcher-contracts/issuesSimilar to event-dispatcher-contracts repositories
Here you may see event-dispatcher-contracts alternatives and analogs
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