Method getChild

packages/forms/signals/src/schema/logic_node.ts:141–161

(key: PropertyKey)

  }

  override getChild(key: PropertyKey): LogicNodeBuilder {
    // Close off the current builder if the key is DYNAMIC and the current builder already has logic
    // for some non-DYNAMIC key. This guarantees that all of the DYNAMIC logic always comes before
    // all of the specific-key logic for any given instance of `NonMergeableLogicNodeBuilder`.
    // We rely on this fact in `getAllChildBuilder` to know that we can return the DYNAMIC logic,
    // followed by the property-specific logic, in that order.
    if (key === DYNAMIC) {
      const children = this.getCurrent().children;
      // Use the children size to determine if there is logic registered for a property other than
      // the DYNAMIC property.
      // - If the children map doesn't have DYNAMIC logic, but the size is still >0 then we know it
      //   has logic for some other property.
      // - If the children map does have DYNAMIC logic then its size is going to be at least 1,
      //   because it has the DYNAMIC key. However if it is >1, then we again know it contains other
      //   keys.
      if (children.size > (children.has(DYNAMIC) ? 1 : 0)) {
        this.current = undefined;
      }
    }
    return this.getCurrent().getChild(key);
  }

  override hasLogic(builder: AbstractLogicNodeBuilder): boolean {
    if (this === builder) {