@molecule/app-tree-view-default

Auto-generated, AI-first package reference for the molecule.dev ecosystem. It is written to be read by coding agents as much as by people, and is generated from this package's source — edit src/index.ts JSDoc, not this file.

Default provider for @molecule/app-tree-view.

Provides an in-memory tree view implementation with node management, selection, and expansion control.

Quick Start

import { provider } from '@molecule/app-tree-view-default'
import { setProvider } from '@molecule/app-tree-view'

setProvider(provider)

Type

provider

Installation

npm install @molecule/app-tree-view-default @molecule/app-tree-view

API

Interfaces

DefaultTreeViewConfig

Provider-specific configuration options.

interface DefaultTreeViewConfig {
  /** Whether to expand all nodes by default. Defaults to `false`. */
  expandAll?: boolean
}

Functions

createProvider(config)

Creates a default tree view provider.

function createProvider(config?: DefaultTreeViewConfig): TreeViewProvider

• config — Optional provider configuration.

Returns: A configured TreeViewProvider.

Constants

provider

Default tree view provider instance.

const provider: TreeViewProvider

Core Interface

Implements @molecule/app-tree-view interface.

Bond Wiring

Setup function to register this provider with the core interface:

import { setProvider } from '@molecule/app-tree-view'
import { provider } from '@molecule/app-tree-view-default'

export function setupTreeViewDefault(): void {
  setProvider(provider)
}

Injection Notes

Requirements

Peer dependencies:

• @molecule/app-tree-view ^1.0.1

Runtime Dependencies

• @molecule/app-tree-view

Fully supported: node CRUD, expansion (expandNode/collapseNode/expandAll/collapseAll), selection with multiSelect, and onExpand (which fires on BOTH expand and collapse — read node.expanded to tell which). Checkboxes: when created with showCheckboxes: true, toggleChecked(id) flips a node's checked state (independent of selected, skips disabled nodes) and getCheckedNodes() returns the checked set; with the knob off, toggleChecked is a no-op. Drag: when created with draggable: true, moveNode(sourceId, targetId, position) reparents/reorders the node (before/after as a sibling, inside as a child), fires onDrop(source, target, position), and returns true; with the knob off — or for a self/descendant/unknown target — it is a rejected no-op returning false and onDrop never fires. getData() returns a deep clone — mutate via the instance methods, not the returned array (getSelectedNodes()/getCheckedNodes() and the on* callbacks expose the live internal nodes).

E2E Tests

End-to-end checklist — drive the RENDERED tree in the live preview (real nodes, no mocks), adapt each item to this app's actual tree screen, and check every box off one by one. A box you can't check is an integration bug to fix — not a skip:

• The root-level nodes from data render on screen with their labels; a node with children shows an expand/collapse affordance and a leaf does not. A node with disabled: true renders non-interactive — clicking it neither selects it nor fires onSelect.
• Expanding a parent reveals its child rows and collapsing hides them again, and the expanded STATE is reflected: the re-rendered node shows its expanded affordance and the node's expanded flag in getData() matches what's on screen. expandAll()/collapseAll() open/close the whole tree; each toggle fires onExpand with the affected node.
• Clicking a node selects it: onSelect fires with THAT node (verify its id/label), the row is visibly highlighted, and the node appears in getSelectedNodes().
• Single vs multi matches config: with multiSelect off (default), selecting a second node REPLACES the first (getSelectedNodes() holds one); with multiSelect: true, selections ACCUMULATE (the set grows).
• A deeply nested node renders indented under its full parent chain — the on-screen depth/indent matches the data nesting, not a flat list.
• If showCheckboxes is enabled, a checkbox renders per node and toggling one updates that node's selected state and getSelectedNodes(). Where the app wires parent/child cascade, checking a parent also checks its rendered children (the core exposes selection state, not a built-in cascade).
• If draggable is enabled, dragging a node onto another fires onDrop with the source, target, and position (before/after/inside) and the tree re-renders in the new order; onDrop never fires when draggable is off.