arrayUtils.js

export class ArrayUtils {
  static chunk<T>(array: T[], chunkSize: number): T[][] {
    const chunks: T[] = [];
  
    let index = 0;
    while(index < array.length){
      chunks.push(array.slice(index, index + chunkSize);
      index += chunkSize
    }
    return chunks;
  }
}

Should be:

export class ArrayUtils {
  static chunk<T>(array: T[], chunkSize: number): T[][] {
    const chunks: T[][] = [];

    let index = 0;
    while (index < array.length) {
      chunks.push(array.slice(index, index + chunkSize));
      index += chunkSize;
    }
    return chunks;
  }
}