Angular 6 many Can’t resolve errors (crypto, fs, http, https, net, path, stream, tls, zlib)

This is caused by dependencies importing node modules that are not available in the browser. Add to your package.json the modules that give errors:

"browser": {
    "http": false,
    "https":false,
    "net": false,
    "path": false,
    "stream": false,
    "tls": false
}