Function fiberRefUnsafeMakePatch

packages/effect/src/internal/core.ts:1984–2006

(
  initial: Value,
  options: {
    readonly differ: Differ.Differ<Value, Patch>
    readonly fork: Patch
    readonly join?: ((oldV: Value, newV: Value) => Value) | undefined
  }
)

/** @internal */
export const fiberRefUnsafeMakePatch = <Value, Patch>(
  initial: Value,
  options: {
    readonly differ: Differ.Differ<Value, Patch>
    readonly fork: Patch
    readonly join?: ((oldV: Value, newV: Value) => Value) | undefined
  }
): FiberRef.FiberRef<Value> => {
  const _fiberRef = {
    ...CommitPrototype,
    [FiberRefTypeId]: fiberRefVariance,
    initial,
    commit() {
      return fiberRefGet(this)
    },
    diff: (oldValue: Value, newValue: Value) => options.differ.diff(oldValue, newValue),
    combine: (first: Patch, second: Patch) => options.differ.combine(first, second),
    patch: (patch: Patch) => (oldValue: Value) => options.differ.patch(patch, oldValue),
    fork: options.fork,
    join: options.join ?? ((_, n) => n)
  }
  return _fiberRef
}

/** @internal */
export const fiberRefUnsafeMakeRuntimeFlags = (