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According to docs, "it's always legal to provide a callback that accepts fewer arguments": https://www.typescriptlang.org/docs/handbook/declaration-files/do-s-and-don-ts.html#optional-parameters-in-callbacks Morever, react-redux docs say that ownProps will have a value when it is specified as a callback argument: https://github.com/reactjs/react-redux/blob/master/docs/api.md#the-arity-of-mapstatetoprops-and-mapdispatchtoprops-determines-whether-they-receive-ownprops