Refactoringgood first issuehelp wanted
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描述
When using db-migrate programmatically for multiple databases, warnings are generated for EventEmitter leaks: Warning: Possible EventEmitter memory leak detected. 11 unhandledRejection listeners added.
Adding a unregisterEvents function to api.js should enable programmatic users to get around this. Such a function may also be used more generally to do proper cleanup.
Where registerEvent() is called:
https://github.com/db-migrate/node-db-migrate/blob/master/api.js#L136-L147
Where registerEvents() is defined:
https://github.com/db-migrate/node-db-migrate/blob/master/api.js#L136-L147
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