The French government has taken care to reassure British expatriates that they are welcome to stay in France, whatever happens with Brexit.
France’s no-deal legislation
On 17 January 2019, French Prime Minister Edouard Philippe confirmed legislation that allowed his French government to make quick decisions by decree in the event of a no deal Brexit. Learn the full details as to what the French government has planned for British Expatriates in the source article from Blevins Franks