Function idToPathAndNamespace

packages/vite/src/node/optimizer/pluginConverter.ts:307–318

(
  id: string | undefined,
)

  id: string | undefined,
): [path: string | undefined, namespace: string]
function idToPathAndNamespace(
  id: string | undefined,
): [path: string | undefined, namespace: string] {
  if (id === undefined) return [undefined, 'file']

  const namespaceIndex = id.indexOf(':')
  if (namespaceIndex >= 0) {
    return [id.slice(namespaceIndex + 1), id.slice(0, namespaceIndex)]
  } else {
    return [id, 'file']
  }
}