Validate env complete implementation reading the env file variables a compare them against the zod object

validate_env.ts

import fs from 'fs';
import path from 'path';

import Environment from '../src/@types/env';

const APP_ENV = process.env.APP_ENV ?? 'dev';
const isDev = APP_ENV === 'dev';
const envFile = path.join(__dirname, isDev ? '../.env' : `../.env.${APP_ENV}`);

(() => {
  const fileExists = fs.existsSync(envFile);
  if (!fileExists) {
    console.error(
      `❌ Missing .env.${APP_ENV} file. Make sure you have .env.${APP_ENV} file in the root directory.`,
    );
    throw new Error(`Missing .env.${APP_ENV} file. Check terminal for more details`);
  }
  const content = fs.readFileSync(envFile, 'utf8');
  const envVars = content.split('\n');

  const jsonObject: { [key: string]: string } = {};

  envVars.forEach((envVar: string) => {
    if (envVar === '') {
      return;
    }
    const [key, value] = envVar.split('=');

    jsonObject[key] = value;
  });

  const parsed = Environment.safeParse(jsonObject);
  if (!parsed.success) {
    console.error(
      '❌ Invalid environment variables:',
      parsed.error.flatten().fieldErrors,
      `\n❌ Missing variables in .env.${APP_ENV} file, Make sure all required variables are defined in the .env.${APP_ENV} file.`,
    );
    throw new Error('Invalid environment variables, Check terminal for more details ');
  }
})();

export default {};

validate_env_1.ts

import fs from 'fs';
import path from 'path';

import NativeConfig from './env';

const APP_ENV = process.env.APP_ENV ?? 'dev';
const isDev = APP_ENV === 'dev';
const envFile = path.join(__dirname, isDev ? '../.env' : `../.env.${APP_ENV}`);

(() => {
  const fileExists = fs.existsSync(envFile);
  if (!fileExists) {
    console.error(
      `❌ Missing .env.${APP_ENV} file. Make sure you have .env.${APP_ENV} file in the root directory.`,
    );
    throw new Error(`Missing .env.${APP_ENV} file. Check terminal for more details`);
  }
// ...
})();

export default {};

validate_env_2.ts

  // ... prev code
const content = fs.readFileSync(envFile, 'utf8');
const envVars = content.split('\n');

const jsonObject: { [key: string]: string } = {};

envVars.forEach((envVar: string) => {
  if (envVar === '') {
    return;
  }
  const [key, value] = envVar.split('=');

  jsonObject[key] = value;
});

validate_env_3.ts

 const parsed = NativeConfig.safeParse(jsonObject);
 if (!parsed.success) {
    console.error(
      '❌ Invalid environment variables:',
      parsed.error.flatten().fieldErrors,
      `\n❌ Missing variables in .env.${APP_ENV} file, Make sure all required variables are defined in the .env.${APP_ENV} file.`,
    );
    throw new Error('Invalid environment variables, Check terminal for more details ');
  }