In short
A type formed by combining multiple types with `|`, meaning a value can be one of several possible types (e.g. `string | number`).
How to learn this
- 1Model a function parameter that accepts either a `string` or `number`.
- 2Practice narrowing a union type using `typeof` or `in` checks.
- 3Model a set of related states as a union of object shapes — a 'discriminated union'.
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