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An npm ERESOLVE unable to resolve dependency tree error means npm cannot build a dependency tree that satisfies the peer-dependency requirements it is enforcing. First identify the package declaring the incompatible peer range, then choose compatible package versions, commit the updated lockfile, and verify the result with npm ci. A successful install after bypassing peer checks is not proof that the dependency combination is supported.
What an npm ERESOLVE error means
A peerDependency declares that a package expects to work with a host package or library at a compatible version. Plugins commonly use peer dependencies to state which versions of their host they support. npm 7 and later install peer dependencies by default; npm 3 through 6 did not automatically install them and instead warned when a peer dependency was invalid. See npm’s package.json documentation.
When peer requirements cannot be reconciled, npm may stop with ERESOLVE. The specific conflicting packages and ranges depend on your project; the error output is the starting point for diagnosing them. npm can tolerate some deep peer conflicts by choosing a nearer non-peer dependency specification and issuing a warning. Setting strict-peer-deps makes those conflicts fail instead. The behavior and flags are documented in npm install.
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- Capture the full error. Run the failing install again if needed and retain the complete ERESOLVE output. Identify the package that requires a peer, the peer version range it declares, the host version present or requested, and any other package imposing a competing range.
- Check the packages’ manifests and release notes. Confirm which package declares the peer range and whether a maintained release supports the host version your project needs. npm advises package authors to make peer requirements as broad as actual compatibility permits rather than pinning specific patch versions; see npm’s package.json documentation.
- Choose a compatible tree. Prefer updating or changing the package versions so the declared peer ranges are satisfied. Review the scope of that change: a fix may involve one package or several, and a broad dependency update can have wider consequences than a targeted adjustment.
- Review and commit the lockfile.
package.jsondefines acceptable version ranges, whilepackage-lock.jsonrecords the resolved tree. When locked versions satisfy the manifest ranges, npm uses them; when they do not,npm installresolves versions and updates the lockfile. Commit the reviewed lockfile so local development, deployments, and CI can reproduce the same resolution. See npm install and npm’s package-lock documentation. - Verify from a clean state. Run
npm ciin the project and in the same configuration used by CI. It requires a lockfile, removes the existingnode_modulesdirectory, and installs from the lockfile without rewritingpackage.jsonorpackage-lock.json. It fails when the manifest and lockfile disagree. Details are in npm ci documentation.
How should engineering leaders compare possible fixes?
Evaluate each proposed resolution on four practical dimensions. These are decision criteria, not a scoring model defined by npm.
#1 Best Overall
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- Compatibility confidence: Does the package combination satisfy its declared peer ranges, or does the proposed fix only bypass their enforcement?
- Change scope: Does it require changing one dependency, several related packages, or a broad set of dependency ranges?
- Reproducibility: Is the resulting lockfile reviewed and committed, and does the same clean install succeed in CI?
- Ongoing maintenance: Is the chosen combination supported by maintained releases, or does it depend on a temporary exception with an owner and a defined removal condition?
What does --legacy-peer-deps do?
--legacy-peer-deps tells npm to ignore peer dependencies while constructing the dependency tree. It can let an install proceed despite a peer conflict, but it does not establish that the packages are compatible. npm warns that “Use of legacy-peer-deps is not recommended, as it will not enforce the peerDependencies contract that meta-dependencies may rely on.” That warning appears in npm’s CLI v7 configuration documentation.
If an emergency makes the workaround unavoidable, treat it as a temporary compatibility risk: record why it is needed, which packages are affected, what validation was performed, who owns the exception, and what condition will trigger its removal. This is a governance practice, not an npm-mandated approval process.
Rank #2
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How is --omit=peer different?
--omit=peer is not equivalent to --legacy-peer-deps. npm describes --omit=peer as still designing a tree in which peer dependencies could be placed correctly, while legacy mode ignores peer dependencies when building the tree. Check the current npm install documentation for the CLI version your project uses.
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npm install can update the lockfile as it resolves versions, whereas npm ci performs a clean, frozen install and rejects disagreement between the manifest and lockfile. A successful local install therefore does not guarantee that CI can reproduce the dependency tree from the committed files.
Rank #3
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Configuration can also differ. If the lockfile was created using a tree-shaping flag such as --legacy-peer-deps or --install-links, npm says npm ci must use the same flags or it is likely to encounter errors. npm’s npm ci documentation recommends committing the relevant project-level .npmrc so the setting is consistent. Confirm that local and CI use the same npm configuration and the intended CLI version.
Quick Recap
Best Value
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- Powerful Pass-Through Charging: Supports up to 85W pass-through charging so you can power up your laptop while you use the hub. Note: Pass-through charging requires a charger (not included). Note: To achieve full power for iPad, we recommend using a 45W wall charger.
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Rank #4
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What should be in place before closing the incident?
- The conflicting peer requirement and the packages responsible are understood.
- The chosen package versions are deliberate, and any bypass is documented as a temporary exception.
- The reviewed
package-lock.jsonis committed with the corresponding manifest changes. - A clean
npm cisucceeds in the project’s CI configuration. - Any remaining compatibility uncertainty has an owner and a plan for follow-up.
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