@spec build(map(), map()) :: map()

Builds a tree structure from a lockfile and root dependencies.

Returns a nested map representing the dependency tree.

@spec count(map()) :: non_neg_integer()

Counts total packages in the tree (including nested).

@spec filter(map(), String.t()) :: map()

Filters the tree to only show packages matching a pattern.

@spec flatten(map(), non_neg_integer()) :: [
  {String.t(), String.t(), non_neg_integer()}
]

Flattens a tree to a list of all packages with their depths.

@spec format(map()) :: String.t()

Formats a dependency tree as a string.

@spec max_depth(map()) :: non_neg_integer()

Returns the maximum depth of the tree.