As nicely discussed in this comment, the key ideas of UDT and LDT seem to have been predated by, respectively, “resolute choice” and Spohn’s variant of CDT. (It’s not entirely clear to me how UDT or LDT are formally specified, though, and in my experience people seem to equivocate between different senses of “UDT”.)
Updateless decision theory and logical decision theory
As nicely discussed in this comment, the key ideas of UDT and LDT seem to have been predated by, respectively, “resolute choice” and Spohn’s variant of CDT. (It’s not entirely clear to me how UDT or LDT are formally specified, though, and in my experience people seem to equivocate between different senses of “UDT”.)