Function buildNodeMap

packages/cli/src/commands/dag.ts:225–231

* Build a map of node ID -> DagNode.

(dag: BlockDependencyDag)

 * Build a map of node ID -> DagNode.
 */
function buildNodeMap(dag: BlockDependencyDag): Map<string, DagNode> {
  const map = new Map<string, DagNode>()
  for (const node of dag.nodes) {
    map.set(node.id, node)
  }
  return map
}

/**
 * Find root nodes (nodes with no incoming edges).