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This object tracks the other packages that are required to run the project. Packages are added here automatically by the install ID command, but you can also manually add them and just type install to install them.
The key is the unique slug of the package and the value is the a semvar range, local directory, URL to a zip, or a source control URL.
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Development dependencies operate the same as regular ones, expect they are not required to use this project. Instead, they are only required if you plan to do development on the project. These usually including testing libraries, etc.
The install command will save dependencies here when you use the --saveDev flag. These packages will be skipped when you run install --production