Method _initializeDataDiffer

src/cdk/tree/tree.ts:482–486

()

  }

  private _initializeDataDiffer() {
    // Provide a default trackBy based on `_getExpansionKey` if one isn't provided.
    const trackBy = this.trackBy ?? ((_index: number, item: T) => this._getExpansionKey(item));
    this._dataDiffer = this._differs.find([]).create(trackBy);
  }

  private _checkTreeControlUsage() {
    if (typeof ngDevMode === 'undefined' || ngDevMode) {