1 files changed, 30 insertions, 0 deletions

diff --git a/cli/internal/util/backends.go b/cli/internal/util/backends.go
new file mode 100644
index 0000000..66941ad
--- /dev/null
+++ b/cli/internal/util/backends.go
@@ -0,0 +1,30 @@
+package util
+
+import (
+	"fmt"
+	"io/ioutil"
+	"path/filepath"
+
+	"github.com/vercel/turbo/cli/internal/yaml"
+)
+
+// YarnRC Represents contents of .yarnrc.yml
+type YarnRC struct {
+	NodeLinker string `yaml:"nodeLinker"`
+}
+
+// IsNMLinker Checks that Yarn is set to use the node-modules linker style
+func IsNMLinker(cwd string) (bool, error) {
+	yarnRC := &YarnRC{}
+
+	bytes, err := ioutil.ReadFile(filepath.Join(cwd, ".yarnrc.yml"))
+	if err != nil {
+		return false, fmt.Errorf(".yarnrc.yml: %w", err)
+	}
+
+	if yaml.Unmarshal(bytes, yarnRC) != nil {
+		return false, fmt.Errorf(".yarnrc.yml: %w", err)
+	}
+
+	return yarnRC.NodeLinker == "node-modules", nil
+}