⚛️ Protomodule | Instruments
for browser based JavaScript applications
Protomodule is a set of common practices which span from coding over CI/CD to production deployments. Every utility within Protomodule is able to provide core functionality as a standalone tool. All Protomodule utilities are interoperable to get the most out of your DevOps pipeline with minimum effort.
Instruments is the JavaScript module to integrate Protomodules principles into browser based applications.
Quick start guide
Install Protomodule | Instruments by running:
$ npm install --save @protomodule/instrumentsFeatures
Type-safe environment variables
To access environment variables in a type-safe way create a singleton module with your specific environment schema:
./config.ts
import { fromWeb, requiredStr } from "@protomodule/instruments"
export const config = fromWeb({
REACT_APP_API_URL: requiredStr(),
})In any other part of your application when you need to access an environment variable use:
import { config } from "./config.ts"
console.log(config.REACT_APP_API_URL)In addition to providing a typed configuration object Protomodule | Instruments also check the variables at runtime and will show an alert and ultimatly throw an error when trying to access an invalid configuration.
🖥 Setting environment variables locally
During development this is meant to be used in conjunction with react-script. Therefore you have direct access to your local environment variables.
🌍 Setting environment variables in production
This library follows the Protomodule practice of loading environment variables into window.env in the browser.
This can be achieved by adding a snippet to your HTML's head section:
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8" />
<script src="%PUBLIC_URL%/env.js"></script>
...env.js file should serve to following content:
window.env = {
REACT_APP_API_URL: "https://...",
};If you use the Protomodule related build tools, this file may be generated automatically when configured.
Credits
License
This project is licensed under the terms of the MIT license. See the LICENSE file.
This project is in no way affiliated with Apple Inc or Google Inc. This project is open source under the MIT license, which means you have full access to the source code and can modify it to fit your own needs.
