very useful tool https://direnv.net/
Quick demo

To follow along in your shell once direnv is installed.

# Create a new folder for demo purposes.

 $ mkdir ~/my-project $ cd ~/my-project 

# Show that the FOO environment variable is not loaded.

$ echo ${FOO-nope} nope

# Create a new .envrc. This file is bash code that is going to be loaded by # direnv.

$ echo export FOO=foo > .envrc .envrc is not allowed 

# The security mechanism didn’t allow to load the .envrc. Since we trust it, # let’s allow its execution.

$ direnv allow . direnv: reloading direnv: loading .envrc direnv export: +FOO

# Show that the FOO environment variable is loaded.

$ echo ${FOO-nope} foo

# Exit the project

$ cd .. direnv: unloading 

# And now FOO is unset again

$ echo ${FOO-nope} nope