Env Manager - Grootbit

Env Manager is a utility to manage and validate environment variables in your projects. It ensures your environment variables are correctly set up, reducing runtime errors caused by missing or invalid variables.

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Features

• Schema-based Validation: Define required variables and their types in a schema.
• Type Conversion: Automatically converts strings to integer, float, boolean, or retains as string.
• Singleton Pattern: Ensures a single instance of the manager is used throughout the project.
• Error Handling: Alerts on missing or incorrectly formatted variables.
• Environment Cleanup: Clears loaded environment variables from process.env after validation.

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Installation

Install the package via npm:

npm install env-manager-grootbit

Or using yarn:

yarn add env-manager-grootbit

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Usage

To use Env Manager, define a schema for your environment variables, initialize the manager using the Singleton pattern, and access validated variables across your project.

Example

1. Create a Schema
   Define a schema with the expected variables, their types, and whether they are required.

import { EnvManager, EnvType } from "env-manager-grootbit";

const schema = {
  AWS_ACCESS_KEY: { type: EnvType.STRING, required: true },
  AWS_SECRET_KEY: { type: EnvType.STRING, required: true },
  PORT: { type: EnvType.INTEGER, required: false },
  DEBUG_MODE: { type: EnvType.BOOLEAN, required: false },
};

EnvManager.init(schema);

try {
  const envs = EnvManager.envys;
  console.log("Validated Environment Variables:", envs);
} catch (error) {
  console.error("Environment validation failed:", error.message);
  process.exit(1);
}

2. Access the Singleton Instance
   Once initialized, the EnvManager provides access to validated environment variables via the static envys property.

const envs = EnvManager.envys;
console.log(envs.PORT); // Access validated variables safely

3. Run Your Project
   Set environment variables in your .env file or directly in your system’s environment. Example:

AWS_ACCESS_KEY=your-access-key
AWS_SECRET_KEY=your-secret-key
PORT=3000
DEBUG_MODE=true

Run the application:

npm start

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Key Concepts

Singleton Pattern

The EnvManager now uses the Singleton pattern to ensure that a single instance of the manager is used throughout your project. You initialize the manager once with the init method and access the validated environment variables via the static envys property.

Schema Definition

The schema is an object where each key represents an environment variable. Each variable has the following properties:

• type: The expected data type (EnvType.STRING, EnvType.INTEGER, EnvType.FLOAT, or EnvType.BOOLEAN).
• required: Boolean indicating whether the variable is mandatory.

Supported Types

Type	Description
EnvType.STRING	Standard string values.
EnvType.INTEGER	Numeric values, parsed as integers.
EnvType.FLOAT	Numeric values, parsed as floats.
EnvType.BOOLEAN	true or false values.

Environment Variable Cleanup

After validation, all environment variables defined in the schema are removed from process.env to prevent accidental access. Access them only through the envys property of the EnvManager class.

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Error Handling

• Missing Variables: Throws an error if required variables are missing.
• Type Mismatch: Throws an error if a variable’s value does not match the defined type.
• Extra Variables: Logs a warning if additional variables are detected that are not defined in the schema.

Example Log:

Warning: Extra environment variables detected: UNSUPPORTED_KEY

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Development Notes

This module integrates into your project as a library. Include it in your main entry file, define the schema, and initialize the EnvManager class. The validation process is triggered automatically when accessing the envys property.

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Changelog

v1.0.3

• Introduced the Singleton pattern to ensure a single instance of EnvManager.
• Added the static envys property for simplified access to validated variables.
• Enhanced error handling and logging for extra environment variables.

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License

This project is licensed under the MIT License.