I do not demean the abilities and efforts of Ernst David Bergmann and the team who developed Israel nuclear industry. The French supplied the plutonium separation plant as well as the Dimona reactor. The USA has also supplied much 'dual use' technology (for example Krytons) with a wink and a nod. Israel had plenty of help from two successive 'strategic allies'. Also see: Boosted Fission Weapons, Thermonuclear Weapons, Savanna River Plant.
Monitor: Airstrikes hit Islamic State stronghold in Syria, killing at least 13 (Reuters)
from the article: Report: IAEA to discuss Israel's nuclear activities for first time