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Tagged Union Switch Expression
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| type Tagged<T extends string> = { | |
| type: T | |
| } | |
| export function switchExp< | |
| T extends Tagged<string>, | |
| M extends { [P in T['type']]: T extends Tagged<P> ? (t: T) => any : never } | |
| >(value: T, map: M): ReturnType<M[keyof M]> { | |
| return map[value.type as keyof M](value) | |
| } |
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