Mod is dead simple:

• Swamp: only type of villager that can have librabrian and cleric job, unemployed swamp villager can also harvest nearby nether wart and replant them, use 1 emerald to take some of their warts out (they also deposit into a chest if passively walked to it, though this is currently kinda buggy).
• Jungle: can have fletcher job, harvesting crop has a 50% chance to +3 the items.
• Plains: can have butcher, shepherd, leatherworker job.
• Taiga: can have armorer and toolsmith job.
• Desert: can have catographer and mason job.
• Tundra: can have armorer, toolsmith, butcher and leatherworker, all emerald trade is reduced by 2.
• Savana: can have butcher, shepherd, leatherworker job.

• All the other jobs that are not mentioned can be taken globally by every villager type.