Thanks for your answer even it does not run at the data.lua step.
I read again the doc https://lua-api.factorio.com/latest/Data-Lifecycle.html
I wrote a test mod and get the base version from the mods["base"].


local factorion_version = mods["base"]


the mods["base"] is available at the steps ...

Hello,

I search a way to detect the factorio base version at runtime.
For sample in data.lua

local factorio_version = "0.16.51" -- HERE: how to get this version string !

local factorio_major_version = factorio_version:sub(1,4)

if factorio_major_version == "0.16" then
data:extend({
...CODE FOR ...

Hello,

The release before 0.16.42 seems good.

The issue was introduce in the 0.16.42.
The issue is found in all version since 0.16.42 up to the lastest 0.17.32.

The value of the version field in the `base/info.json` file does not match the release.

Good (0.16.41):
https://github.com/wube ...