Introduction to adjust-env

The adjust-env package is a powerful tool that allows developers to dynamically adjust environment variables for application development and testing. It provides a range of APIs that make managing environment-specific configurations straightforward and efficient.

Basic Usage

The following example demonstrates how to set and get environment variables using adjust-env:

  
    const { setEnv, getEnv } = require('adjust-env');

    // Set an environment variable
    setEnv('MY_ENV_VAR', 'some value');

    // Get an environment variable
    const myEnvVar = getEnv('MY_ENV_VAR');
    console.log(myEnvVar); // Outputs: some value
  

Conditional Environment Settings

You can also set environment variables conditionally:

  
    const { setEnv } = require('adjust-env');

    if (process.env.NODE_ENV === 'development') {
      setEnv('DEBUG', 'true');
    }
  

Loading Environment Variables from a File

adjust-env supports loading variables from a .env file:

  
    const { loadEnvFromFile } = require('adjust-env');

    // Load variables from .env file
    const envVars = loadEnvFromFile('.env');

    console.log(envVars); // Outputs all env variables loaded from file
  

App Example

Here is a simple application that demonstrates the use of adjust-env:

  
    const express = require('express');
    const { setEnv, getEnv, loadEnvFromFile } = require('adjust-env');

    // Load environment variables
    loadEnvFromFile('.env');

    // Create an Express app
    const app = express();

    // Example middleware to adjust environment
    app.use((req, res, next) => {
      if (req.query.env === 'production') {
        setEnv('NODE_ENV', 'production');
      } else {
        setEnv('NODE_ENV', 'development');
      }
      next();
    });

    app.get('/', (req, res) => {
      res.send(`Running in ${getEnv('NODE_ENV')} mode`);
    });

    // Start the server
    const PORT = process.env.PORT || 3000;
    app.listen(PORT, () => {
      console.log(`Server is running on port ${PORT}`);
    });
  

adjust-env is highly flexible and can significantly streamline the configuration management process in your applications.

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