Swift "no such module 'X'" for an SPM dependency in CI

The compiler tried to import X but no module named X was built or found. With SwiftPM this usually means the dependency was not resolved, not declared as a target dependency, or the build ran before packages were fetched.

What this error means

Compilation fails with "error: no such module 'X'" at the import line, even though the package is listed in Package.swift.

swift

Sources/App/Client.swift:1:8: error: no such module 'Networking'
import Networking
       ^

Common causes

The dependency is not a declared target dependency

The package is in .package(...) but the importing target does not list the product in its dependencies:, so the module is not on the compile path.

Packages were not resolved or restored before build

A cache miss or a skipped resolve step means the module was never built, so the import cannot find it.

How to fix it

Declare the product as a target dependency

Add the dependency product to the importing target's dependencies:.
Confirm the product name matches what the package exports.
Rebuild.

Package.swift

.target(
  name: "App",
  dependencies: [
    .product(name: "Networking", package: "networking")
  ]
)

Resolve packages before building

Ensure a resolve step runs (and any SwiftPM cache is restored) so the module is built before compilation.

Terminal

swift package resolve
swift build

How to prevent it

List every imported product in the target's dependencies:.
Restore the .build/SourcePackages cache before building.
Run swift package resolve as an explicit early step in CI.