Artifactory does not support shrinkwrap URLs for NPM dependencies. The npm client uses checksums in order to verify a package, and using shrinkwrap forces changing the checksum on-the-fly. This is time consuming and will result in a time out.
Additionally hard coding NPM dependency URLs is not best practice and shrinkwrapped URLs are known to have issues when interacting with proxies:
Npm install -ddd will show resolution ignoring .npmrc configurations
id="docs-internal-guid-e8cfb494-8566-01c0-f04c-590266a187d6">Usually to registry.npmjs.org
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Resolution results in a 400 error
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One possible error is “418: I am a teapot”
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If registry.npmjs.org is unavailable, the resolution could hang and/or time out