Type:
Configuration | MultiConfiguration | ((env: Record<string, any>, argv: Record<string, any>) => MaybePromise<Configuration | MultiConfiguration>) | ((env: Record<string, any>, argv: Record<string, any>) => MaybePromise<Configuration | MultiConfiguration>)[] | Promise<Configuration | MultiConfiguration | ((env: Record<string, any>, argv: Record<string, any>) => MaybePromise<Configuration | MultiConfiguration>) | ((env: Record<string, any>, argv: Record<string, any>) => MaybePromise<Configuration | MultiConfiguration>)[]>