I've designed a customized Button component.
interface Button {
href?: string;
action(): void;
}
I'm looking to ensure that when a consumer uses this Button, they can only pass either href or action as a prop, not both.
I want TypeScript to validate this requirement during compilation. Can you suggest how I could achieve this?
If you want to specify a type that can have one property or another, you can use a union type
type Car = {
color: string;
speed?: never
} | {
speed: number;
color?: never;
}
let car1: Car = { color: "red" };
let car2: Car = { speed: 100 };
let car3: Car = { speed: 50, color: "blue" }; // error
To trigger an error, make sure to include optional never properties in the union type definition. This is necessary because of how excess property checks function. You can learn more about this concept here. Alternatively, you could explore using the StrictUnion type mentioned in the linked resource, though it may be excessive for handling just two properties.
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