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NPM Link can be useful for cases where you are working on an NPM module and need to test the changes in another NPM module.

(see: NPM link )

Link the module you are developing globally on your system.

# run from the directory of the module you are developing in
# depending on your system, you may need to use sudo
npm link 
 
 
Add your linked module to the module you want to test in.
# run from the root directory for the module you want to test the developed module with
# <module-name> should be replaced by the name of the module you want to link in, this is derived from the name in its package.json file.
npm link <module-name>
 
When you no longer require the local link (e.g. finished testing ), remove the links to clean up the test settings.
# run from the directory of the module you are developing.
# depending on your system, you may need to use sudo
npm unlink
 
# in the root directory for the module you tested the developed module with
# <module-name> should be replaced by the name of the module you linked in, this is derived from the name in its package.json file.
npm unlink <module-name>

# run the install again to ensure that all the dependencies are properly installed
npm install
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