Flatten a tree in DFS order
flattenTree
Functionutils/tree
projects/utils/tree.ts
Description#
Flatten a tree in DFS order. Each emitted FlatTreeNode carries
aria-level (depth + 1), aria-posinset, and aria-setsize data so the
rendering layer can bind them directly.
Signature#
flattenTree(nodes, idFn: IdFn, labelFn: LabelFn)Parameters#
@paramnodes
Root-level tree nodes.
@paramidFn
IdFn= defaultIdFn as IdFnDerives a stable id from (value, path). Defaults to
path.join('.') — adequate for static trees; supply a key-based idFn
for data that may be re-ordered without changing identity.
@paramlabelFn
LabelFn= defaultLabelFn as LabelFnDerives visible label. Defaults to String(value).
Returns#
FlatTreeNode[]