Currently, I am working on an interface where I need to implement the following structure:
export interface Passenger {
id: number,
name: string,
checkedIn: boolean,
checkedInDate?: Date // <- Is it possible to make this field optional only when checkedIn is set to false?
}
Declaring this directly within an interface is not possible. Nevertheless, the desired behavior can be achieved by implementing it in a class:
class Traveler {
id: number;
name: string;
checkInDate?: Date;
get isCheckedIn() {
return this.checkInDate != null;
}
}
Is it possible for you to simply disregard the value stored in the variable checkedInDate when the status of checkedIn is marked as true? Perhaps you could consider implementing a solution similar to the following:
if(!pessageobj.checkedIn) {
pessageobj.checkedInDate = new Date();
} else {
pessageobj.checkedInDate = set to a default date such as minimum date;
}
Understanding Union Types:
export type Traveler = {
id: number,
name: string,
checkedIn: true,
checkedInDate: Date
} | {
id: number,
name: string,
checkedIn: false,
checkedInDate?: Date // optional field
}
A parameter template can provide a more specific type for checkedIn rather than just boolean. This allows an intersection to include either the optional or mandatory version of checkedInDate.
export type Passenger<A extends boolean> = {
id: number;
name: string;
checkedIn: A;
} & (A extends false
? {
checkedInDate?: Date;
}
: {
checkedInDate: Date;
});
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