@segment/analytics-next/src/test-helpers/type-assertions.ts

Analytics Next (aka Analytics 2.0) is the latest version of Segment’s JavaScript SDK - enabling you to send your data to any tool without having to learn, test, or use a new API every time.

type IsAny<T> = unknown extends T ? (T extends {} ? T : never) : never
type NotAny<T> = T extends IsAny<T> ? never : T
type NotUnknown<T> = unknown extends T ? never : T

type NotTopType<T> = NotAny<T> & NotUnknown<T>

// this is not meant to be run, just for type tests
export function assertNotAny<T>(_val: NotTopType<T>) {}

// this is not meant to be run, just for type tests
export function assertIs<T extends SomeType, SomeType = any>(_val: T) {}