@tevm/actions/src/utils/ExactlyOne.ts

A typesafe library for writing forge scripts in typescript

/**
 * Helper type to ensure exactly one property from a set is provided
 */
export type ExactlyOne<T, K extends keyof T> = {
	[P in K]: { [Q in P]: T[P] } & { [Q in Exclude<K, P>]?: never }
}[K]