In the user interface, the parameter c is mandatory only if the parameter a is set to true.
interface IArguments {
a: boolean,
b: string,
c: string
}
The solution below seems to be effective, but how can I exclude the c parameter in the first scenario? I used a type since an interface would result in an error.
type TArguments = {
a: true,
b: string,
c?: string
} | {
a: false,
b: string,
c: string
};
This solution may meet your needs. However, you must explicitly define TArgs<true>
type TArgs<T extends boolean> = {
a: T,
b: string,
c: T extends true ? string : null
}
Here is an example of how it could be implemented with a factory function:
type TArgs<T extends true | false> = {
a: T,
c?: T extends true ? string : null
}
const argsFactory = <T extends boolean>(a: T, c: T extends true ? string : null): TArgs<T> => {
return {
a,
c
}
}
// Valid examples
argsFactory(true, "example");
argsFactory(false, null);
// Invalid examples
argsFactory(false, "invalid input");
argsFactory(true, null)
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