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To add an npm package as a development dependency, use bun add --development.
terminal
bun add zod --dev
bun add zod -d # shorthand
This will add the package to devDependencies in package.json. 
{
	"devDependencies": {
		"zod": "^3.0.0"
	}
}
See Docs > Package manager for complete documentation of Bun’s package manager.