Action creators are not 100% type safe

[mixvar]

action creators allow for omitting payload which can easily lead to runtime errors :(

from the example:

const add = createAction<number>('add'); // payload of type number

add(10) // OK
add() // should not compile
add(undefined) // should not compile

handleAction(add, (state, { payload }) => { // payload infered as number (not number | undefined)
    state.counter += payload; // state.counter will be NaN 💀
}),

Tested with typescript 3.4.5 and all strict rules enabled.