• Use a meaningful title for the pull request. Include the name of the package modified.
• Test the change in your own code. (Compile and run.)
• Follow the advice from the readme.
• Avoid common mistakes.
• Run npm run lint package-name (or tsc if no tslint.json is present).

Select one of these and delete the others:

• Provide a URL to documentation or source code which provides context for the suggested changes: https://github.com/moment/luxon/blob/master/src/settings.js
• Increase the version number in the header if appropriate.

Settings was defined as a type, making it impossible to modify the Settings: importing it and modifying it caused the following compilation error: "error TS2693: 'Settings' only refers to a type, but is being used as a value here.".

Note: I initially thought of defining it as a class, but the linter prevented me from doing so because all its members are static. That's why it's defined as a namespace.