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Tom Alter

Jun 14, 2016

How does the flat dependency model work in npm v3?

As you may know npm3 resolves dependencies in flat manner, as opposed to nested. So, my question is what if two different packages A & B depend on two different versions of package C? Will each version of package C be installed separately in node_modules? Would love to get some primer here!

Thank You.

#npm #nodejs

Responses(1)

Peter Scheler

JS enthusiast

Jun 14, 2016

The answer is YES: C will by installed twice. The first installation is under the node_modules folder. The second in npm v2 manner under a node_modules folder in the directory of the module depending on it.

There is a detailed explanation on npm.

Tom Alter

Jun 14, 2016

Thanks! Any idea how it decides which one will be installed in v2 manner and which one in v3 manner?

Peter Scheler

JS enthusiast

Jun 14, 2016

It's the installation order. Let assume A depents on Cv1 and B on Cv2. If you run npm i A B Cv2 will be nested. If you run npm i B A Cv1 will be nested. The following both chapters of the above link will also cover this theme.

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How does the flat dependency model work in npm v3?

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