function assign() {
  return xtend({hellow: "world"}, {source1: "U"}, {source2: "V"}, {source3: "W"}, {source4: "Q"}, {source5: "R"}, {
    hellow: "hellow",
    source1: "source1",
    source2: "source2",
    source3: "source3",
    source4: "source4",
    source5: "source5",
    generic: "any"
  });
}

function assign5(): Result5 {
  return xtend({hellow: "world"}, {source1: "U"}, {source2: "V"}, {source3: "W"}, {source4: "Q"}, {source5: "R"});
}

function assign2(): Result2 {
  return xtend({hellow: "world"}, {source1: "U"}, {source2: "V"});
}

function assign3(): Result3 {
  return xtend({hellow: "world"}, {source1: "U"}, {source2: "V"}, {source3: "W"});
}

function assign1(): Result {
  return xtend({hellow: "world"}, {source1: "U"});
}