Function assertEqualType

assertEqualType<T, U>(..._: [T] extends [U] ? [] : [never]): void
Asserts at compile time that two types are mutually assignable.

Checks assignability in both directions, not exact type identity. Structurally compatible types can pass even if they differ in readonly or optional members. Performs no runtime validation.
Type Parameters
- T
  The first type to compare.
- U
  The second type to compare.
Parameters
- ..._: [T] extends [U] ? [] : [never]
Returns void
Example
```
type A = { name: string };
type B = { name: string };
type C = { name: string; age: number };

assertEqualType<A, B>(); // OK: mutually assignable
assertEqualType<A, C>(); // Error: A is not assignable to C
```
- Defined in type/index.ts:28