![]() Any thing, place, or situation about which nothing is known an unknown fact or piece of information. This types a JSON response and the parsed usable result as data and type. unknown ( plural unknowns ) ( algebra) A variable (usually x, y or z) whose value is to be found. Define BaseObject as the part of ComboObject that you can define straightforwardly: type BaseObject = įor completeness, it was just a small change because I already used Overwrite for this pattern: const customerKeys = as const noun C or U uk / ter.t r.i / us / ter.tr.i / (an area of) land, or sometimes sea, that is considered as belonging to or connected with a particular country. Now we can start taking about your particular issue. ![]() Then use it to detect if a given string type is a single string literal (so: not string, not never, and not a union): type IsASingleStringLiteral = string extends T ? N : extends ? N : IsAUnion If that isn't true, it's because the union has only one constituent (so it isn't a union): type IsAUnion = U extends any The way it works is to use the distributive property of conditional types to spread out a union to constituents, and then notice that each constituent is narrower than the union. Let's do some type manipulation to detect if a given type is a union or not.
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