Exclude-Include-Members.d.ts

/**
 * Creates a mapped type from the `Subject`
 * that excludes all members with types
 * that extend the `ExcludeType`.
 */
type ExcludeBy<Subject, ExcludeType> = {
    [P in {
        [K in keyof Subject]: Subject[K] extends ExcludeType ? never : K
    }[keyof Subject]]: Subject[P]
};
/**
 * Creates a mapped type from the `Subject`
 * that includes only members with types
 * that extend the `IncludeType`.
 */
type IncludeOnly<Subject, IncludeType> = {
    [P in {
        [K in keyof Subject]: Subject[K] extends IncludeType ? K : never
    }[keyof Subject]]: Subject[P]
};