loadEnv.js

/**
 * Generate a `.env.local` file depending on the value from TARGET_ENV environment variable
 */
import fs from 'fs';

/**
 * @description copies the given `.env.base.${TARGET_ENV}` file to a `.env.local` file.
 */

const env = {
  production: 'production',
  testnet: 'testnet',
};

function copyEnvFile() {
  console.log({ envToBuild: process.env.TARGET_ENV });
  const target = env[process.env.TARGET_ENV] || env.testnet;
  const dotenvPath = process.cwd() + `/.env.${target}`;
  const fileStats = fs.statSync(dotenvPath);

  if (!fileStats.isFile()) {
    console.error(`[copyEnvFile] ${dotenvPath} is not a valid file`);
  }

  const buildDotEnv = '.env.local';
  try {
    fs.copyFileSync(dotenvPath, `${process.cwd()}/${buildDotEnv}`);
    console.log(`${buildDotEnv} successfully copied with TARGET_ENV=${target}`);
  } catch (error) {
    console.error(`[copyEnvFile] there was an error copying ${buildDotEnv} file`);
    console.error(error);
  }
  return;
}

copyEnvFile();