npm package: @microparts/configuration-js
Description: Configuration module for microservices written on TypeScript. Specially created for follow up corporate standards of application configuration.
Author: roquie
Latest version: 1.1.0

Javascript microservice configuration library
---------------------------------------------

[![Build Status](https://travis-ci.org/microparts/configuration-js.svg?branch=master)](https://travis-ci.org/microparts/configuration-js)

Production-ready configuration for microservices. Written in TypeScript.
Library works with nodejs apps and with [browsers*](#how-to-usage-library-with-spa-apps).

Library created for follow up corporate standards of application configuration.

## Installation

```bash
npm install --save @microparts/configuration-js
// or
yarn add @microparts/configuration-js
```

## Usage

By default path to configuration directory and application stage
loading from `/app/configuration` with `local` stage.

1) Simple
```ts
import { Configuration } from '@microparts/configuration-js';

const conf = new Configuration();
conf.load();

console.log(conf.all()); // get all config
console.log(conf.get('foo.bar')); // get nested key use dot notation
```

2) If u would like override default values, you can pass 2 arguments to
class constructor or set up use setters.

```ts
import { Configuration } from '@microparts/configuration-js';

const conf = new Configuration('./configuration', 'test');
// or
// conf.path = './configs';
// conf.stage = 'local';
conf.load();

conf.get('foo'); // full example on the top
```

3) If the operating system has an env variables `CONFIG_PATH` and `STAGE`,
then values for the package will be taken from there.

```bash
export CONFIG_PATH=/configuration
export STAGE=prod
```

```ts
import { Configuration } from '@microparts/configuration-js';

const conf = new Configuration('./configuration', 'test');
conf.load(); // loaded files from /configuration for prod stage.

conf.get('foo'); // full example on the top
```

4) If u want to see logs and see how load process working,
pass you logger to property:

Pass it like this:
```ts
import { Configuration, StdoutConsoleLogger } from '@microparts/configuration-js';

const conf = new Configuration();
conf.logger = new StdoutConsoleLogger();
conf.load();

conf.get('foo'); // full example on the top
```

Or if you would like use external logger, like [Winston](https://github.com/winstonjs/winston), you can
integrate it with [LoggerInterface](./src/logger-interface.ts). Just a write the adapter like as [WinstonConsoleLogger](./src/winston-console-logger.ts).

For now, by default library support one Winston transport called `Console`.
Okay, let's go use adapter for him...

First, install logger:
```bash
npm install --save winston
// or yarn add winston
```

Second, pass you logger to property like this:
```ts
import { Configuration, WinstonConsoleLogger, StdoutConsoleLogger } from '@microparts/configuration-js';

const conf = new Configuration();
conf.logger = new WinstonConsoleLogger(winston.createLogger({
  transports: [new winston.transports.Console()]
}));

conf.load();

conf.get('foo'); // get value of `foo`
```

## How to usage library with SPA apps?

**Note:** <br>
https://github.com/microparts/static-server-php is required for usage on the server/cloud.

For most cases, this [Dockerfile](./example/vue-app/Dockerfile) can help your application build's in the cloud.

It simple. Step by step:

1. Create an vue app for example
```bash
vue create vue-app
```
2. Install this package
```bash
npm install --save @microparts/configuration-js
```
3. Put config files [like this](./example/vue-app/configuration)
4. Change `vue.config.js` to build final config to global variables:
```js
const { Configuration, StdoutConsoleLogger } = require('@microparts/configuration-js');

module.exports = {
  lintOnSave: false,
  chainWebpack: config => {
    config.plugin('html').tap(options => {
      const conf = new Configuration('./configuration');
      conf.logger = new StdoutConsoleLogger(); // new StdoutConsoleLogger(true); // for debug
      conf.load();

      options[0].__config = conf.asEscapedJson();
      options[0].__stage = conf.stage;

      return options;
    });
  }
};
```

5. Add following code to `index.html` to **top** of `<head>` html tag (**before all scripts**):

```html
<head>
  <% if (htmlWebpackPlugin.options.__stage === 'local') { %>
    <script>
      window.__config = JSON.parse("<%= htmlWebpackPlugin.options.__config %>");
      window.__stage = '<%= htmlWebpackPlugin.options.__stage %>';
      window.__vcs = '';
    </script>
  <% } %>
<!-- ... meta tags and other code -->
```

6. Add globals to `.eslintrc`:

```json
"globals": {
  "__config": "readonly",
  "__stage": "readonly",
  "__vcs": "readonly"
 },
```

7. Run application.
```bash
npm run serve
```

Full example available at [here](./example/vue-app).

## License

The MIT License

Copyright © 2020 spacetab.io, Inc. https://spacetab.io

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.