Cannot find name 'process' angular 5 - node.js

Question

After seeing all the answers, nothing helped me...
baseUrl.interceptor.ts
intercept(req: HttpRequest<any>, next: HttpHandler): Observable<HttpEvent<any>> {
let baseurl = process.env.baseurl || 'http://test.com/users';
console.log(baseurl);
return next.handle(req);
}
tsconfig.json
"typeRoots": [
"node_modules/#types"
]
package.json
"dependencies": {
"#angular/animations": "^5.1.0",
"#angular/common": "^5.1.0",
"#angular/compiler": "^5.1.0",
"#angular/core": "^5.1.0",
"#angular/forms": "^5.1.0",
"#angular/http": "^5.1.0",
"#angular/platform-browser": "^5.1.0",
"#angular/platform-browser-dynamic": "^5.1.0",
"#angular/router": "^5.1.0",
},
"devDependencies": {
"#angular/cli": "1.6.4",
"#angular/compiler-cli": "^5.1.0",
"#angular/language-service": "^5.1.0",
"#types/jasmine": "~2.8.3",
"#types/jasminewd2": "~2.0.2",
"#types/node": "~6.0.60",
"codelyzer": "^4.0.1",
...
"ts-node": "~3.2.0",
"tslint": "~5.9.1",
"typescript": "~2.5.3"
}
And an error below:
Please, help me somebody...

Answer 1

process is a variable that gives you access to your server.
In no case you are supposed to use it in your Angular application : it's made to be used on your Node server.
If you do that, this means that anyone who is running your application can see your environment variables. That includes, for instance, your API keys.

Answer 2

I'm setting up my environment within Angular with a dotenv file, I don't know if this is the same situation you have. That's where I'm requesting my env vars.
I set up the environment files dinamically with a node script before compilation time with fs.writeFile. There I can get the process.env and thanks to the 'dotenv' npm package also.