Revert "fix: stop loading package dependencies (#2988)"

This reverts commit 99d7d88.

Making this change stopped builds with Bazel from functioning.

internal/code/packages.go

@@ -21,10 +21,12 @@ var (
 
 var mode = packages.NeedName |
 	packages.NeedFiles |
+	packages.NeedImports |
 	packages.NeedTypes |
 	packages.NeedSyntax |
 	packages.NeedTypesInfo |
-	packages.NeedModule
+	packages.NeedModule |
+	packages.NeedDeps
 
 type (
 	// Packages is a wrapper around x/tools/go/packages that maintains a (hopefully prewarmed) cache of packages
@@ -133,6 +135,11 @@ func (p *Packages) LoadAll(importPaths ...string) []*packages.Package {
 func (p *Packages) addToCache(pkg *packages.Package) {
 	imp := NormalizeVendor(pkg.PkgPath)
 	p.packages[imp] = pkg
+	for _, imp := range pkg.Imports {
+		if _, found := p.packages[NormalizeVendor(imp.PkgPath)]; !found {
+			p.addToCache(imp)
+		}
+	}
 }
 
 // Load works the same as LoadAll, except a single package at a time.
@@ -213,9 +220,18 @@ func (p *Packages) NameForPackage(importPath string) string {
 	return pkg.Name
 }
 
-// Evict removes a given package import path from the cache. Further calls to Load will fetch it from disk.
+// Evict removes a given package import path from the cache, along with any packages that depend on it. Further calls
+// to Load will fetch it from disk.
 func (p *Packages) Evict(importPath string) {
 	delete(p.packages, importPath)
+
+	for _, pkg := range p.packages {
+		for _, imported := range pkg.Imports {
+			if imported.PkgPath == importPath {
+				p.Evict(pkg.PkgPath)
+			}
+		}
+	}
 }
 
 func (p *Packages) ModTidy() error {

internal/code/packages_test.go

@@ -30,6 +30,14 @@ func TestPackages(t *testing.T) {
 		require.Equal(t, 2, p.numLoadCalls)
 	})
 
+	t.Run("evicting a package also evicts its dependencies", func(t *testing.T) {
+		p := initialState(t)
+		p.Evict("github.com/99designs/gqlgen/internal/code/testdata/a")
+		require.Equal(t, "a", p.Load("github.com/99designs/gqlgen/internal/code/testdata/a").Name)
+		require.Equal(t, 2, p.numLoadCalls)
+		require.Equal(t, "b", p.Load("github.com/99designs/gqlgen/internal/code/testdata/b").Name)
+		require.Equal(t, 3, p.numLoadCalls)
+	})
 	t.Run("able to load private package with build tags", func(t *testing.T) {
 		p := initialState(t, WithBuildTags("private"))
 		p.Evict("github.com/99designs/gqlgen/internal/code/testdata/a")