bun.sh/docs/guides/install/registry-scope.md

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Configure a private registry for an organization scope with bun install

Bun does not read .npmrc files; instead private registries are configured via bunfig.toml. To configure a registry for a particular npm scope:

[install.scopes]
# as a string
"@myorg1" = "https://username:password@registry.myorg.com/"

# as an object with username/password
# you can reference environment variables
"@myorg2" = {
  username = "myusername",
  password = "$npm_pass",
  url = "https://registry.myorg.com/"
}

# as an object with token
"@myorg3" = { token = "$npm_token", url = "https://registry.myorg.com/" }

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Your bunfig.toml can reference environment variables. Bun automatically loads environment variables from .env.local, .env.[NODE_ENV], and .env. See Docs > Environment variables for more information.

[install.scopes]
"@myorg3" = { token = "$npm_token", url = "https://registry.myorg.com/" }

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