bun.sh/docs/guides/install/add-peer.md

name

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Add a peer dependency

To add an npm package as a peer dependency, directly modify the peerDependencies object in your package.json. Running bun install will install peer dependencies by default, unless marked optional in peerDependenciesMeta.

{
  "peerDependencies": {
+   "zod": "^3.0.0"
  }
}

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See Docs > Package manager for complete documentation of Bun's package manager.