I am currently working on defining constraints for the method field
type event = {
[k: `on${string}`]:(e:string)=>void
}
However, I need the event argument to be a number for fields that do not begin with 'on'
type event = {
[k: `${xxx}`]:(e:number)=>void // XXX does not start with 'on'
}
Can someone help me figure out what should replace XXX?
In my exploration, I have experimented with the following approach to see if it yields any positive results. By splitting the keys into two different categories and then merging them using the concept of Mapped Types from Typescript.
type CallbackType = (x: number) => void;
type KeysWithoutOn = {
key1: CallbackType
key2: CallbackType
}
type KeysWithOn = {
onKey1: CallbackType,
onKey2: CallbackType
}
type CombinedKeys = KeysWithoutOn & KeysWithOn;
const combinedValues: CombinedKeys = {
key1: (x: number) => console.log(x + 10),
key2: (y: number) => console.log(y + 20),
onKey1: (x: number) => console.log(x + 10),
onKey2: (x: number) => console.log(x + 10)
}
const withoutOnValues: KeysWithoutOn = combinedValues;
const withOnValues: KeysWithOn = combinedValues;
withoutOnValues.key1(30);
withOnValues.onKey1(50);
type DesiredEvents = {
[Property in keyof CombinedKeys]: CallbackType
}
const eventsContainer: DesiredEvents = combinedValues;
const eventsContainerWithoutOnKeys: KeysWithOn = eventsContainer;
const eventsContainerWithOnKeys: KeysWithoutOn = eventsContainer;
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