Merge branch 'master' into 'main'

.gitignore

.gitlab-ci.yml

.npmignore

.npmrc

README.md

docs/mutation/index.html

examples/defaults-overwrite/config.defaults.json

examples/defaults-overwrite/config.json

examples/defaults-overwrite/index.js

examples/env/config.defaults.json

examples/env/config.json

examples/env/index.js

examples/files/config.defaults.json

examples/files/config.json

examples/files/index.js

examples/files/setting_1.txt

examples/files/setting_2.txt

examples/only-defaults/config.defaults.json

examples/only-defaults/index.js

examples/only-local/config.json