Today I Learned

If you need to manually test a package you are developing and don't want to make a release each time you modify something, you can install it directly from your local machine.

You can achieve this by using the following commands, depending on the package manager you use:

yarn add [path-to-your-package]

npm install [path-to-your-package]

This will have the following equivalent in package.json:

...
"dependencies": {
    "[package]": "file:[relative-path-to-package]",
    ...
},