Method getChild

packages/forms/signals/src/schema/logic_node.ts:371–395

* Retrieves the `LogicNode` for a child identified by the given property key. * @param key The property key of the child. * @returns The `LogicNode` for the specified child.

(key: PropertyKey)

   * @returns The `LogicNode` for the specified child.
   */
  getChild(key: PropertyKey): LogicNode {
    // The logic for a particular child may be spread across multiple builders. We lazily combine
    // this logic at the time the child logic node is requested to be created.
    const childBuilders = this.builder ? getAllChildBuilders(this.builder, key) : [];
    if (childBuilders.length === 0) {
      return new LeafLogicNode(undefined, [], this.depth + 1);
    } else if (childBuilders.length === 1) {
      const {builder, predicates} = childBuilders[0];
      return new LeafLogicNode(
        builder,
        [...this.predicates, ...predicates.map((p) => bindLevel(p, this.depth))],
        this.depth + 1,
      );
    } else {
      const builtNodes = childBuilders.map(
        ({builder, predicates}) =>
          new LeafLogicNode(
            builder,
            [...this.predicates, ...predicates.map((p) => bindLevel(p, this.depth))],
            this.depth + 1,
          ),
      );
      return new CompositeLogicNode(builtNodes);
    }
  }

  hasLogic(builder: AbstractLogicNodeBuilder): boolean {
    if (!this.builder) {