Is is possible to put a function as key in computed key ES6?

I am coming across this snippet of code in the redux-connect library and I wonder is it possible to put a function as a key in the computed key in ES6. How does this work and how javascript interprets ?

export const reducer = handleActions({
  [beginGlobalLoad]: state => ({
   ...state,
  loaded: false,
}),

[endGlobalLoad]: state => ({
  ...state,
  loaded: true,
})
....
}

with beginGlobalLoad is a function that is created by

export const beginGlobalLoad = createAction('@redux-conn/BEGIN_GLOBAL_LOAD');

I read over the concept of dynamic computed key but it does not say anything about using the function as the key for the property.

Thanks a lot for your answer

Links to the library: https://github.com/makeomatic/redux-connect/blob/master/modules/store.js