Как прочитать последние строки файла?

def tail_file(filename, n=10):
    with open(filename, 'rb') as f:
        # Перемещаемся в конец файла
        f.seek(0, 2)
        file_size = f.tell()
        
        block_size = 1024
        data = []
        lines_found = 0
        
        # Читаем блоки с конца
        while file_size > 0 and lines_found < n:
            read_size = min(block_size, file_size)
            f.seek(file_size - read_size)
            block = f.read(read_size).decode('utf-8', errors='ignore')
            file_size -= read_size
            
            # Считаем строки в блоке
            lines = block.split('\n')
            # Первая часть блока может быть обрезанной строкой
            if len(data) > 0:
                data[-1] = lines[-1] + data[-1]
                lines = lines[:-1]
            data = lines + data
            lines_found = len(data)
        
        return data[-n:]

# Использование
last_lines = tail_file('app.log', 5)
for line in last_lines:
    print(line)

const fs = require('fs');
const readLastLines = (filePath, maxLines) => {
    const stats = fs.statSync(filePath);
    const bufferSize = 1024;
    let lines = [];
    let lineCount = 0;
    let position = stats.size;
    
    while (position > 0 && lineCount < maxLines) {
        const length = Math.min(bufferSize, position);
        const buffer = Buffer.alloc(length);
        const fd = fs.openSync(filePath, 'r');
        fs.readSync(fd, buffer, 0, length, position - length);
        fs.closeSync(fd);
        
        const chunk = buffer.toString('utf-8');
        const chunkLines = chunk.split('\n');
        if (lines.length > 0) {
            lines[0] = chunkLines.pop() + lines[0];
        }
        lines = chunkLines.concat(lines);
        lineCount = lines.length;
        position -= length;
    }
    return lines.slice(-maxLines);
};

// Использование
const lines = readLastLines('server.log', 5);
console.log(lines);