Function replacementNode

packages/core/src/effect/layer-node.ts:135–151

(source: AnyNode, replacement: AnyNode | Layer.Any)

type ValidReplacements<Items extends Replacements> = Items & CheckReplacements<Items>

function replacementNode(source: AnyNode, replacement: AnyNode | Layer.Any) {
  const replacementNode = isNode(replacement)
    ? replacement
    : make({
        ...nodeMakeIdentity(source),
        layer: replacement as Layer.Layer<unknown, unknown>,
        deps: [],
        tag: source.tag,
      })
  if (source.name !== replacementNode.name) {
    throw new Error(`Cannot replace ${source.name} with ${replacementNode.name}`)
  }
  if (source.tag !== replacementNode.tag) {
    throw new Error(`Cannot replace ${source.name} across tags`)
  }
  return replacementNode
}

function nodeMakeIdentity(node: AnyNode): NodeIdentity {
  if (node.service !== undefined) return { service: node.service }