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interface ObjectConstructor {
assign<T, U>(target: T, source: U): T & U;
assign<T, U, V>(target: T, source1: U, source2: V): T & U & V;
assign<T, U, V, W>(target: T, source1: U, source2: V, source3: W): T & U & V & W;
...
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function xx<S extends 'x'>(str: S)function xx(str: 'x')Т