Remove method from a class in a .ts file

index.js

const ts = require('typescript');
const path = require('path');
const fs = require('fs');

function getAsEnumerable(file, node) {
  const nodes = [node];

  node.getChildren(file).forEach(n => {
    nodes.push(...getAsEnumerable(file, n));
  });

  return nodes;
}

function readdirR(dir) {
  return fs.statSync(dir).isDirectory()
    ? Array.prototype.concat(...fs.readdirSync(dir).map(f => readdirR(path.join(dir, f))))
    : dir;
};

// remove method from a class command

const cmdPath = 'src/path';
const files = readdirR(cmdPath);
files.forEach(file => {
  if (!file.endsWith('.ts') || file.endsWith('.spec.ts')) {
    return;
  }

  const tsFile = ts.createSourceFile(path.basename(file), fs.readFileSync(file, 'utf8'), ts.ScriptTarget.Latest);
  const nodes = getAsEnumerable(tsFile, tsFile);
  for (var i = 0; i < nodes.length; i++) {
    const node = nodes[i];
    if (node.name &&
      node.name.text === 'commandHelp') {
      fs.writeFileSync(file, tsFile.text.substr(0, node.pos) + tsFile.text.substr(node.end), 'utf8');
      break;
    }
  }
});

package.json

{
  "name": "removeTsMethod",
  "version": "1.0.0",
  "description": "",
  "main": "index.js",
  "scripts": {
    "test": "echo \"Error: no test specified\" && exit 1"
  },
  "keywords": [],
  "author": "",
  "license": "ISC",
  "dependencies": {
    "typescript": "^3.9.7"
  }
}