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To add an npm package as an optional dependency, use the --optional flag.

terminal

bun add zod --optional

This will add the package to optionalDependencies in package.json.

package.json

{
  "optionalDependencies": {
    "zod": "^3.0.0"
  }
}

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

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