Understanding the Difference Between WARN and ERR in npm Peer Dependency Resolution

I encountered a puzzling situation where two projects faced the same issue, yet npm resolved them differently:

  1. https://github.com/Sairyss/domain-driven-hexagon
npm ERR! code ERESOLVE
npm ERR! ERESOLVE unable to resolve dependency tree
npm ERR!
npm ERR! While resolving: <a href="/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="ed8982808c8483c0899f849b8883c08588958c8a8283addfc3ddc3dd">[email protected]</a>
npm ERR! Found: <a href="/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="63100f0c0d0a082350524d574d51">[email protected]</a>
npm ERR! node_modules/slonik
npm ERR!   slonik@"^31.2.4" from the root project
npm ERR!
npm ERR! Could not resolve dependency:
npm ERR! peer slonik@"27 - 29" from @slonik/<a href="/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="462b2f21342732293406766877776875">[email protected]</a>
npm ERR! node_modules/@slonik/migrator
npm ERR!   @slonik/migrator@"^0.11.3" from the root project
npm ERR!
npm ERR! Fix the upstream dependency conflict, or retry
npm ERR! this command with --force or --legacy-peer-deps
npm ERR! to accept an incorrect (and potentially broken) dependency resolution.
  1. https://github.com/ddd-by-examples/library-nestjs
npm WARN ERESOLVE overriding peer dependency
npm WARN While resolving: <a href="/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="f6848e9c85db909984db9781979f82b6c6d8c6d8c4">[email protected]</a>
npm WARN Found: <a href="/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="e4969c8e97a4d3cad0cad4">[email protected]</a>
npm WARN node_modules/rxjs
npm WARN   rxjs@"^7.0.0" from the root project
npm WARN   5 more (@nestjs/common, @nestjs/config, @nestjs/core, ...)
npm WARN
npm WARN Could not resolve dependency:
npm WARN peer rxjs@"^6.0.0" from <a href="/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="9defe5f7eeb0fbf2efb0fceafcf4e9ddadb3adb3af">[email protected]</a>
npm WARN node_modules/rxjs-for-await
npm WARN   rxjs-for-await@"0.0.2" from @nrwl/<a href="/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="0c626368694c3d3f223e223e">[email protected]</a>
npm WARN   node_modules/@nrwl/node
npm WARN   1 more (@nrwl/tao)
npm WARN
npm WARN Conflicting peer dependency: <a href="/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="2b595341586b1d051d051c">[email protected]</a>
npm WARN node_modules/rxjs
npm WARN   peer rxjs@"^6.0.0" from <a href="/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="0b79736178266d6479266a7c6a627f4b3b253b2539">[email protected]</a>
npm WARN   node_modules/rxjs-for-await
npm WARN     rxjs-for-await@"0.0.2" from @nrwl/<a href="/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="6907060d0c29585a475b475b">[email protected]</a>
npm WARN     node_modules/@nrwl/node
npm WARN     1 more (@nrwl/tao)

The interesting observation is that while both projects had conflicting peer dependencies with the main project, the first project resulted in an error ("unable to resolve dependency tree"), whereas the second project issued a warning about overriding the peer dependency.

javascriptnode.jsnpmnpm-install

Answer №1

In a scenario where the initial constraints given have conflicting requirements, like 

<a href="/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="26554a49484f4d4e64551508120814">[email protected]</a>
and slonik@"27 - 29", it becomes impossible for both conditions to be satisfied simultaneously. This is primarily due to npm's limitation of constructing a dependency tree with multiple versions of the same package. In such cases, npm prioritizes resolving to a single version that fulfills all criteria. If this resolution is unachievable, an error is thrown. The upper limit set by slonik@"27 - 29" leads npm to assume that anything above version 30 is incompatible.

Similarly, in another example, conflicting directives are present with rxjs@"^7.0.0" and rxjs@"^6.0.0". While the caret symbol indicates acceptance of minor and bugfix updates but not major releases, one requirement pertains to version 7.x.y while the other specifies 6.x.y. With no upper restriction imposed by the second dependency, npm arbitrates the situation by opting for the higher version number, potentially introducing bugs but not necessarily causing failure.

Additional insights on npm and semantic versioning can be found here.

To address conflicts like the first case, adjusting the version of slonik to ^29.0.0 or seeking an updated iteration of @slonik/migrator aligned with a recent slonik build from the root of the project may offer a more suitable solution.

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