export declare const combine: {
  (that: FiberRefsPatch): (self: FiberRefsPatch) => FiberRefsPatch
  (self: FiberRefsPatch, that: FiberRefsPatch): FiberRefsPatch
}

export declare const diff: (oldValue: FiberRefs.FiberRefs, newValue: FiberRefs.FiberRefs) => FiberRefsPatch

export declare const empty: FiberRefsPatch

export declare const patch: {
  (fiberId: FiberId.Runtime, oldValue: FiberRefs.FiberRefs): (self: FiberRefsPatch) => FiberRefs.FiberRefs
  (self: FiberRefsPatch, fiberId: FiberId.Runtime, oldValue: FiberRefs.FiberRefs): FiberRefs.FiberRefs
}

export interface Add {
  readonly _tag: "Add"
  readonly fiberRef: FiberRef.FiberRef<unknown>
  readonly value: unknown
}

export interface AndThen {
  readonly _tag: "AndThen"
  readonly first: FiberRefsPatch
  readonly second: FiberRefsPatch
}

export interface Empty {
  readonly _tag: "Empty"
}

export type FiberRefsPatch = Empty | Add | Remove | Update | AndThen

export interface Remove {
  readonly _tag: "Remove"
  readonly fiberRef: FiberRef.FiberRef<unknown>
}

export interface Update {
  readonly _tag: "Update"
  readonly fiberRef: FiberRef.FiberRef<unknown>
  readonly patch: unknown
}