| impressionDataAll | no| `false` | Allows you to trigger "impression" events for **all** `getToggle` and `getVariant` invocations. This is particularly useful for "disabled" feature toggles that are not visible to frontend SDKs. |

| environment | no | `default` | Sets the `environment` option of the [Unleash context](https://docs.getunleash.io/reference/unleash-context). This does **not** affect the SDK's [Unleash environment](https://docs.getunleash.io/reference/environments). |

| usePOSTrequests | no | `false` | Configures the client to use POST requests instead of GET when requesting enabled features. This is helpful when sensitive information (like user email, when used as a user ID) is passed in the context to avoid leaking it in the URL. NOTE: Post requests are not supported by the frontend api built into Unleash. |