Using NPM packages within the process environment

Can you explain how all these packages are installed in process.env? Also, why is NODE_ENV not visible when I run npm scripts?

"start": "NODE_ENV=dev npm run build && npm run watch && npm run tslint"

https://i.sstatic.net/OpahA.png

Here are my npm scripts:

"scripts": {
    "start": "npm run build && npm run watch && npm run tslint",
    "build": "npm run build-ts",
    "serve": "nodemon dist/Server.js",
    "watch": "concurrently -k -p \"[{name}]\" -n \"TypeScript,Node\" -c \"yellow.bold,cyan.bold,green.bold\" \"npm run watch-ts\" \"npm run serve\"",
    "test": "mocha --compilers ts:ts-node/register",
    "build-ts": "tsc",
    "watch-ts": "tsc -w",
	"tslint": "tslint -c tslint.json -p tsconfig.json",
    "debug": "npm run build && npm run watch-debug",
    "serve-debug": "nodemon --inspect dist/Server.js",
    "watch-debug": "concurrently -k -p \"[{name}]\" -n \"TypeScript,Node\" -c \"yellow.bold,cyan.bold,green.bold\" \"npm run watch-ts\" \"npm run serve-debug\""
},
typescriptnpmtypescript-typingsnpm-scripts

Answer №1

How did all these packages end up in process.env?

process.env represents the system's environment variables. For example, run the command env. More information can be found here: https://nodejs.org/api/process.html#process_process_env

Why don't I see NODE_ENV being set?

When you execute the command 

NODE_ENV=dev npm run build && npm run watch && npm run tslint
, the variable is not permanently stored in the environment. However, it will be available while running npm run build.

Answer №2

To properly configure environment variables, you can use the following script as shown in "serve": The correct configuration is 

"serve": "NODE_ENV=development nodemon dist/Server.js",
.

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