es-check-min/dist/lib/index.js

A CLI tool and library to find the minimum compatible ECMAScript version of a JavaScript file.

import { execa } from 'execa';
import path from 'node:path';
import { fileURLToPath } from 'node:url';
import { findPackage } from 'pkg-types';

async function getEsCheckPath() {
  const packagePath = await findPackage(path.resolve(path.dirname(fileURLToPath(import.meta.url))));
  return path.join(path.dirname(packagePath), "/node_modules/.bin/es-check");
}

const esCheckPath = await getEsCheckPath();
const esVersions = [
  // 'es3', // not working
  "es5",
  "es6/es2015",
  "es7/es2016",
  "es8/es2017",
  "es9/es2018",
  "es10/es2019",
  "es11/es2020",
  "es12/es2021",
  "es13/es2022"
  // 'es14/es2023', // not working
];
async function esCheckMin(path) {
  for (const esVersion of esVersions) {
    const cleanVersion = esVersion.split("/").at(-1) ?? esVersion;
    try {
      await execa(esCheckPath, [cleanVersion, path, "--silent", "--allow-hash-bang", "--module"]);
      return esVersion;
    } catch {
      continue;
    }
  }
  return void 0;
}

export { esCheckMin };