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Discriminated Union
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| enum ItemType { | |
| BunBottom, | |
| BunTop, | |
| Burger | |
| } | |
| type Cooked = [ number, number ] | |
| type Item = { | |
| type: ItemType.BunBottom | |
| } | { | |
| type: ItemType.BunTop | |
| } | { | |
| type: ItemType.Burger, | |
| cooked: Cooked | |
| } |
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