# Reference

{% hint style="info" %}
📘 Flagship SDK Reference

Please refer to the [JS SDK Documentation](https://docs.developers.flagship.io/docs/javascript-reference-beta#/) for Flagship classes
{% endhint %}

## ABTastyProvider class

The `ABTastyProvider` implements the OpenFeature Provider interface and is responsible for:

* Initializing the Flagship Client:\
  It starts the Flagship client using the provided environment ID, API key, and correct config.
* Creating a Visitor:\
  It instantiates a visitor with context details (e.g., targetingKey, user context), fetches the associated flags, and updates context (if needed).
* Logging Adaptation:\
  Uses an AdapterLogger to map Flagship logging to the OpenFeature Logger interface.
* Delegating Resolution:\
  Delegates flag resolution tasks to the ABTastyResolver, which performs the resolution based on visitor context.

### Key Methods

#### constructor(envId: string, apiKey: string, config?: IFlagshipConfig, logger?: OpenFeatureLogger)

* Description: Initializes the Flagship client. It:
  * Starts the Flagship client using the provided environment ID and API key.
* Arguments:

| Name   | Type   | Required     | Description                                                                |
| ------ | ------ | ------------ | -------------------------------------------------------------------------- |
| envId  | String | **Required** | Environment ID provided by Flagship.                                       |
| apiKey | String | **Required** | Api authentication key provided by Flagship.                               |
| config | Object | **Optional** | Custom flagship configuration. [see SDK configuration](#sdk-configuration) |
| logger | Object | **Optional** | AdapterLogger instance.                                                    |

Example:

```javascript
const {
    ABTastyProvider,
} = require("@flagship.io/openfeature-provider-js");

// Step 1: Start the OpenFeature SDK by providing the environment ID and API key
let provider = new ABTastyProvider("<ENV_ID>", "<API_KEY>");
```

#### initialize(context?: EvaluationContext)

* Description: Internally called by the OpenFeature class when the provider is set and initializes the visitor. It:
  * Creates a new visitor with the given evaluation context.
  * Fetches feature flags.
  * Instantiates the ABTastyResolver.
  * Emits the provider's Ready event.
* Arguments:
  * context: Optional context (e.g., targeting key and additional user data).
* Returns:
  * A promise that resolves when initialization completes.

Example:

```javascript
const {
    ABTastyProvider,
} = require("@flagship.io/openfeature-provider-js");
const { OpenFeature } = require("@openfeature/server-sdk");

// Step 1: Start the OpenFeature SDK by providing the environment ID and API key
let provider = new ABTastyProvider("<ENV_ID>", "<API_KEY>");

// Step 2: Set Flagship SDK as provider
await OpenFeature.setProviderAndWait(provider);
```

#### getConfig(): IFlagshipConfig

* Description: Retrieves the current configuration settings used by the Flagship client.
* Returns:
  * The configuration object (IFlagshipConfig).

#### close(): Promise\<void>

* Description: Gracefully shuts down the Flagship client connection.
* Returns:
  * A promise that resolves when the client has successfully closed.


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