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fs.writeFile(file, data[, options], callback)#
History:

• file <string> | <Buffer> | <URL> | <integer> filename or file descriptor
  
• data

  <string> | <Buffer> | <TypedArray> | <DataView> | <Object>

  
  
• options <Object> | <string>
  • encoding <string> | <null> Default: 'utf8'
    
  • mode <integer> Default: 0o666
    
  • flag <string> See support of file system flags. Default: 'w'.
    
  • signal <AbortSignal> allows aborting an in-progress writeFile
    
  
  
• callback <Function>
  • err <Error> | <AggregateError>
    
  
  
  

When file is a filename, asynchronously writes data to the file, replacing the file if it already exists. data can be a string or a buffer.

When file is a file descriptor, the behavior is similar to calling fs.write() directly (which is recommended). See the notes below on using a file descriptor.

The encoding option is ignored if data is a buffer.

If data is a plain object, it must have an own (not inherited) toString function property.
...

type Char = "A" | "B" | "C" | "D";
type ConcatMap<T> = T extends unknown
    ? {} extends T[keyof T]
        ? `${string & keyof T}`
        : `${string & keyof T}${ConcatMap<T[keyof T]>}`
    : never;
type MapChars<C extends Char> = {
    [K in C]: MapChars<Exclude<C, K>>
};
type Split<S extends string> = S extends `${infer H}${infer Tail}`
    ? [H, ...Split<Tail>]
    : [];
type T1 = Split<T2>;
type T2 = ConcatMap<MapChars<Char>>;

<!-- Для примера -->
<div id="data"></div>

fetch('https://www.cbr.ru/currency_base/daily/')
  .then(response => response.text())
  .then(data => {
    const parser = new DOMParser();
    const pageDOM = parser.parseFromString(data, "text/html");
    const tableData = pageDOM.querySelector('.data');
    
    // Для примера	
    const dataElement = document.getElementById('data');
    dataElement.innerHTML = tableData;

    console.log(tableData)
  });

For example, if we run the following script which is not within an I/O cycle (i.e. the main module), the order in which the two timers are executed is non-deterministic, as it is bound by the performance of the process: [...]

However, if you move the two calls within an I/O cycle, the immediate callback is always executed first:

const getKeys = obj =>
  obj instanceof Object
    ? Object.entries(obj).flatMap(n => [ n[0], ...getKeys(n[1]) ])
    : [];

API (программный интерфейс приложения, интерфейс прикладного программирования) (англ. application programming interface, API [эй-пи-ай][1]) — описание способов (набор классов, процедур, функций, структур или констант), которыми одна компьютерная программа может взаимодействовать с другой программой

Такое вообще возможно?

$items = array_combine(
  array_column($arr2['entries'], 'name_item'),
  $arr2['entries']
);

$keys = [ 'price_item', 'image_item' ];

foreach ($arr1 as $n) {
  foreach ($keys as $k) {
    $n[$k] = $items[$n[0]][$k];
  }

  $arr3[] = $n;
}