Assert Lefthook is running with an environment variable #1093
Description
⚡ Summary
Setting LEFTHOOK environment variable to true (or 1) when Lefthook is running.
Alternatively, LEFTHOOK_VERSION variable can be added or runtime to indicate that one runs Lefthook with an extra information the release number.
Value
Currently, one can disable Lefthook via LEFTHOOK=0. But I guess there is no way to detect Lefthook running. For example, some development/debugging tools may be interested whether they are loaded/used within pre-commit check. Resolving this issue would help.
Behavior and configuration changes
I guess this would not be a breaking change. I am not familiar with the codebase structure, but if you find the idea interesting I can try to implement and add tests.