Method _getNodeDef

src/cdk/tree/tree.ts:576–589

* Finds the matching node definition that should be used for this node data. If there is only * one node definition, it is returned. Otherwise, find the node definition that has a when * predicate that returns true with the data. If none return true, return the default node * definition.

(data: T, i: number)

   * definition.
   */
  _getNodeDef(data: T, i: number): CdkTreeNodeDef<T> {
    if (this._nodeDefs.length === 1) {
      return this._nodeDefs.first!;
    }

    const nodeDef =
      this._nodeDefs.find(def => def.when && def.when(i, data)) || this._defaultNodeDef;

    if (!nodeDef && (typeof ngDevMode === 'undefined' || ngDevMode)) {
      throw getTreeMissingMatchingNodeDefError();
    }

    return nodeDef!;
  }

  /**
   * Create the embedded view for the data node template and place it in the correct index location