Created
January 9, 2020 11:59
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Merges a union type into a type with properties of all union components
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| type Merge<Union> = AddOptionalProperties<Union, keyof UnionToIntersection<Union>> | |
| type AddOptionalProperties<Union, Properties extends keyof any> = | |
| Union extends (infer Component) | |
| ? { [P in keyof Union]: Union[P] } & { [P in Exclude<Properties, keyof Union>]?: never } | |
| : never | |
| // https://stackoverflow.com/a/50375286/1183577 | |
| type UnionToIntersection<Union> = | |
| (Union extends any ? (_: Union) => void : never) extends ((_: infer Component) => void) ? Component : never |
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