# getRequiredProperty method

1. @override

String getRequiredProperty(

1. String key

)

Returns the property value for `key`, or throws IllegalStateException if the property is not defined.

This is useful for required configuration values such as API keys.

### Example:

    final apiKey = resolver.getRequiredProperty('security.apiKey');

## Implementation

    @override
    String getRequiredProperty(String key) => _propertyResolver.getRequiredProperty(key);