Detect ES version of file

index.js

const detect = require('detect-es-version');
const path = require('path');

async function main() {
    const file = path.resolve('./file-to-be-detect.js');
    const ecmaVersion = await detect.getEntryPointEcmaVersion(file);

    console.log(file, ecmaVersion); // prints 2015
}

main()
    .catch(reason => {
        error(reason);
        process.exit(1);
    });

package.json

{
  "name": "es-version",
  "version": "1.0.0",
  "description": "",
  "main": "index.js",
  "scripts": {
    "test": "echo \"Error: no test specified\" && exit 1"
  },
  "author": "",
  "license": "ISC",
  "dependencies": {
    "detect-es-version": "^0.1.4"
  }
}