export declare const ContextBuilder: {
  readonly empty: ContextBuilder<never>
  readonly fromContext: <I>(context: C.Context<I>) => ContextBuilder<I>
  readonly fromTag: <I, S>(tag: C.Tag<I, S>, s: S) => ContextBuilder<I>
}

export interface ContextBuilder<I> {
  readonly context: C.Context<I>
  readonly add: <I2, S>(tag: C.Tag<I2, S>, s: S) => ContextBuilder<I | I2>
  readonly merge: <I2>(builder: ContextBuilder<I2>) => ContextBuilder<I | I2>
  readonly mergeContext: <I2>(context: C.Context<I2>) => ContextBuilder<I | I2>
  readonly pick: <S extends ReadonlyArray<C.ValidTagsById<I>>>(
    ...tags: S
  ) => ContextBuilder<C.Tag.Identifier<S[number]>>
}