Convert C# filenamespace to legacy namespace

csharp-namespace-helper.js

const fs = require("fs");
const path = require("path");

var folderPath = "./";

var files = fs.readdirSync(folderPath, { recursive: true })
  .filter(x => x.endsWith('.cs'))
  .map((fileName) => {
    return path.join(folderPath, fileName);
  })
  .map(x => {
    let content = fs.readFileSync(x, 'utf-8');
    let lines = content.indexOf('\r\n') >= 0
        ? content.split('\r\n')
        : content.split('\n')
    return {
      filePath: x,
      lines: lines
    }
  })
  .filter(x => {
    return x.lines.some(line => /^namespace [^;]+;$/.test(line.trim()))
  })
  .map(x => {
    let namespaceLine = x.lines.find(line => /^namespace [^;]+;$/.test(line.trim()));
    let indexOfSemicolon = x.lines.indexOf(namespaceLine);
    x.lines[indexOfSemicolon] = namespaceLine.replace(';', '');

    for(let i=indexOfSemicolon+1; i<x.lines.length; i++) {
        if (!x.lines[i] || /^\s+$/.test(x.lines[i])) continue;

        x.lines[i] = '    ' + x.lines[i];
    }

    x.lines.splice(indexOfSemicolon+1, 0, '{')
    x.lines.push('}');

    return x;
  })
  .map(x => {
    fs.writeFileSync(x.filePath, x.lines.join('\n'));
    return x;
  });

console.log(files);