Making changes in products does not reflect into other products.

[muchitto]

Describe the bug When a product depends on another product in the same project, it seems when making changes in the product (in this case the Library product/target), it does not reflect instantly in the executable product/target.

To Reproduce Steps to reproduce the behavior:

1. Create file structure as follows:

   Sources/
   Library/
       Library.swift
   swift-error-test/
       main.swift
   Package.swift

2. Add these files:

Library.swift:

public func libraryTest(thing: String) {
}

main.swift:

import Library

libraryTest(thing: "test")

Package.swift:

import PackageDescription

let package = Package(
  name: "swift-error-test",
  products: [
    .executable(name: "swift-error-test", targets: ["swift-error-test"]),
    .library(name: "Library", targets: ["Library"]),
  ],
  targets: [
    .executableTarget(
      name: "swift-error-test",
      dependencies: [
        "Library"
      ]
    ),
    .target(name: "Library"),
  ]
)

3. Change something in Library.swift, change the name of the function or argument name.

I have to rebuild from command line and restart the the editor for the changes to be reflected.

Expected behavior Changes are instantly reflected.

Environment

• OS: MacOS Sonoma 14.5
• Swift version: 5.10
• Visual Studio Code version: 1.90.1
• vscode-swift version: v1.10.1

[adam-fowler]

You need to rebuild at the moment for the index to be updated. There is work going on in SourceKit-LSP to enable background indexing, which will hopefully be available in Swift 6