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/** A function that accepts a potential "extra argument" value to be injected later,
* and returns an instance of the thunk middleware that uses that value
*/
function createThunkMiddleware(extraArgument) {
// Standard Redux middleware definition pattern:
// See: https://redux.js.org/tutorials/fundamentals/part-4-store#writing-custom-middleware
var middleware = function middleware(_ref) {
var dispatch = _ref.dispatch,
getState = _ref.getState;
return function (next) {
return function (action) {
// The thunk middleware looks for any functions that were passed to `store.dispatch`.
// If this "action" is really a function, call it and return the result.
if (typeof action === 'function') {
// Inject the store's `dispatch` and `getState` methods, as well as any "extra arg"
return action(dispatch, getState, extraArgument);
} // Otherwise, pass the action down the middleware chain as usual
return next(action);
};
};
};
return middleware;
}
var thunk = createThunkMiddleware(); // Attach the factory function so users can create a customized version
// with whatever "extra arg" they want to inject into their thunks
thunk.withExtraArgument = createThunkMiddleware;
export default thunk;