Is it possible to set a property type based on the property value?
For example, if the command is:
Currently, the closest solution I have found is:
export interface Command {
command: 'set' | 'put' | 'del';
payload: PayloadSet | PayloadPut | PayloadDel;
}
However, this allows the user to set a command and input an incorrect payload.
Construct it as a coalition:
type Directive =
| { directive: 'initialize'; data: DataInitialize; }
| { directive: 'add'; data: DataAdd; }
| { directive: 'remove'; data: DataRemove; }
If we want to get creative with conditional types, one approach is to introduce a generic to the Command interface:
interface PayloadDel { }
interface PayloadPut {}
interface PayloadSet {}
type Commands = 'set' | 'put' | 'del'
export interface Command<K extends Commands> {
command: K;
payload: K extends 'set' ? PayloadSet : K extends 'put' ? PayloadPut : PayloadDel;
}
let command: Command<'set'>
With this setup, the type of the payload is determined by the type of K.
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