fnx_config 1.2.0

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fnx_config - configuration management

This is a transformer which helps you manage different configurations for different builds of your web app.

Usually you need different configuration for different environments:

String apiRoot = "http://localhost:8080/api/v1
// Use in production!!!!!
// String apiRoot = "http://this-is-very-important.qwerty/api/v1/"

... and that's just terrible. Let's try something else.


Add transformer to your pubspec.yaml:

  fnx_config: ^1.0.0

- fnx_config

Then create configuration profiles (YAML files). Usually you will need two of them.

  • lib/conf/config_debug.yaml - for pub serve
  • lib/conf/config_release.yaml - for pub build

Content of those files is completely up to you, it's probably going to be something like this:

ourSecretApiKey: qwertyuiop
ourSecretApiUrl: http://this-is-very-secret.qwerty/api/v1/

Then add <script type="pub/fnx_config"></script> into the <head> of your HTML files and run pub serve.


Transformer searches for HTML files with this instruction, and replaces it with encoded content of your YAML file:

var fnx_config = "eyJjb25maWciOnsiYWhvai  ... tMjlUMTg6NDE6MjAuMTkwIn19";

The reason why we encode the configuration, is that we don't want to tempt the user with too much knowledge. We don't need any bored teenager to play with our API endpoints and API keys.

Please don't mistake this feature for any kind of security, it's just simple BASE64 and the configuration will be accessible to any skilled user. But a little bit of obfuscation cannot do any harm.

See example.



import 'package:fnx_config/fnx_config_read.dart';

and access your configuration via global function:

String apiKey = fnxConfig()["ourSecretApiKey"];

fnx_config also adds few metadata you might find useful:

fnxConfigMeta()["mode"]; // pub build mode (--mode=qwerty)
fnxConfigMeta()["timestamp"]; // timestamp of build    

Multiple configuration profiles

Simply add more configuration files:


and use them with pub:

pub build --mode=qwerty
pub serve --mode=jenkins



With Polymer, place fnx_config transformer after web_components

- web_components:
		entry_points: web/index.html
- reflectable:
		entry_points: web/index.dart
- fnx_config


Also with Angular2, keep the transformer at the end of the list.

Firebase example

Typical usage with firebase looks like this:


  apiKey: "AIzaSyDq6qYBJHOMmdsdsEsKFiotLxKmjqA"
  authDomain: "my-app-1af5.firebaseapp.com"
  databaseURL: "https://my-app-1af5.firebaseio.com"
  storageBucket: "my-app-1af5.appspot.com"


import 'package:firebase3/firebase.dart' as f;
import 'package:fnx_config/fnx_config_read.dart';
Map cfg = fnxConfig();    
f.App app = f.initializeApp(
  apiKey: cfg["firebase"]["apiKey"],
  authDomain: cfg["firebase"]["authDomain"],
  databaseURL: cfg["firebase"]["databaseURL"],
  storageBucket: cfg["firebase"]["storageBucket"]


  • Allowed versions of crypto >=0.9.1 <3.0.0.
  • Firebase example in README.
  • Replaced packaged html5lib with html


Small bugfix.


Initial public version.

Use this package as a library

1. Depend on it

Add this to your package's pubspec.yaml file:

  fnx_config: ^1.2.0

2. Install it

You can install packages from the command line:

with pub:

$ pub get

Alternatively, your editor might support pub get. Check the docs for your editor to learn more.

3. Import it

Now in your Dart code, you can use:

import 'package:fnx_config/fnx_config.dart';
Version Uploaded Documentation Archive
1.2.0 Oct 28, 2016 Go to the documentation of fnx_config 1.2.0 Download fnx_config 1.2.0 archive
1.1.0 Oct 12, 2016 Go to the documentation of fnx_config 1.1.0 Download fnx_config 1.1.0 archive
1.0.1 Mar 2, 2016 Go to the documentation of fnx_config 1.0.1 Download fnx_config 1.0.1 archive
1.0.0 Oct 30, 2015 Go to the documentation of fnx_config 1.0.0 Download fnx_config 1.0.0 archive
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The package version is not analyzed, because it does not support Dart 2. Until this is resolved, the package will receive a health and maintenance score of 0.

Issues and suggestions

Support Dart 2 in pubspec.yaml.

The SDK constraint in pubspec.yaml doesn't allow the Dart 2.0.0 release. For information about upgrading it to be Dart 2 compatible, please see https://www.dartlang.org/dart-2#migration.


Package Constraint Resolved Available
Direct dependencies
Dart SDK >=1.8.0 <2.0.0