Function loadConfigSources

loadConfigSources(
    blueprint: IBlueprint,
    sources: ConfigSource[],
    options?: ConfigSourceManagerOptions,
): Promise<void>
Convenience: load and merge sources straight into the blueprint.
Parameters
- blueprint: IBlueprint
  The application blueprint.
- sources: ConfigSource[]
  The sources (merged in order).
- options: ConfigSourceManagerOptions = {}
  The manager options.
Returns Promise<void>
Example
```
@Configuration()
export class AppConfig {
  async configure (blueprint) {
    await loadConfigSources(blueprint, [envSource(), fileSource({ path: './config.yaml' })])
  }
}
```