split a yaml file into multiple ones based on the first level key

package.json

{
  "name": "split-yaml",
  "version": "1.0.0",
  "main": "split-yaml.js",
  "scripts": {
    "split": "node split-yaml.js"
  },
  "dependencies": {
    "js-yaml": "^3.14.0",
    "readline": "^1.3.0"
  }
}

split-yaml.js

const fs = require('fs');
const yaml = require('js-yaml');
const readline = require('readline');

// Get the name of the input YAML file from the command-line arguments
const [, , inputYamlFile] = process.argv;

// Load the YAML file into a JavaScript object
const yamlObj = yaml.safeLoad(fs.readFileSync(inputYamlFile));

// Create a readline interface for prompting the user
const rl = readline.createInterface({
  input: process.stdin,
  output: process.stdout,
});

// Loop over each top-level key in the object
Object.keys(yamlObj).forEach(key => {
    // Create a copy of the value object
    const value = Object.assign({}, yamlObj[key]);

    // Change the key name from "groups" to "members"
    value.members = value.groups;
    delete value.groups;

    // Create a new object containing only the key and its modified value
    const obj = { [key]: value };

    // Convert the object to a YAML string
    const yamlStr = yaml.safeDump(obj);

  // Check if a file with the same name already exists
  if (fs.existsSync(`${key}.yaml`)) {
    // Prompt the user for confirmation before overwriting the file
    rl.question(`File "${key}.yaml" already exists. Overwrite? (Y/n) `, answer => {
      if (answer.toLowerCase() === 'y' || answer === '') {
        // Write the YAML string to the file if the user confirms
        fs.writeFileSync(`${key}.yaml`, yamlStr);
      }
      rl.close();
    });
  } else {
    // Write the YAML string to the file if it does not already exist
    // Write the YAML string to a file named after the key
    fs.writeFileSync(`${key}.yaml`, yamlStr);
  }
});

To use this script, save it to a file (e.g. split-yaml.js) and run it using node split-yaml.js input.yaml, where input.yaml is the name of the input YAML file.