Make Single Package repo work with globalDependencies config

cli/integration_tests/single_package/dry-run.t

@@ -6,23 +6,23 @@ Check
   $ ${TURBO} run build --dry --single-package
 
   Global Hash Inputs
-    Global Files               = 2
+    Global Files               = 3
     External Dependencies Hash = 
     Global Cache Key           = Buffalo buffalo Buffalo buffalo buffalo buffalo Buffalo buffalo
     Root pipeline              = {"//#build":{"outputs":["foo"],"cache":true,"dependsOn":[],"inputs":[],"outputMode":"full","env":[],"persistent":false}}
 
   Tasks to Run
   build
     Task                             = build                                                                                                       
-    Hash                             = 7bf32e1dedb04a5d                                                                                            
+    Hash                             = dd4a9a7b508b0e38                                                                                            
     Cached (Local)                   = false                                                                                                       
     Cached (Remote)                  = false                                                                                                       
     Command                          = echo 'building' > foo                                                                                       
     Outputs                          = foo                                                                                                         
     Log File                         = .turbo/turbo-build.log                                                                                      
     Dependencies                     =                                                                                                             
     Dependendents                    =                                                                                                             
-    Inputs Files Considered          = 4                                                                                                           
+    Inputs Files Considered          = 5                                                                                                           
     Configured Environment Variables =                                                                                                             
     Inferred Environment Variables   =                                                                                                             
     Global Environment Variables     = VERCEL_ANALYTICS_ID=                                                                                        
@@ -34,7 +34,7 @@ Check
     "tasks": [
       {
         "task": "build",
-        "hash": "7bf32e1dedb04a5d",
+        "hash": "dd4a9a7b508b0e38",
         "cacheState": {
           "local": false,
           "remote": false
@@ -63,7 +63,8 @@ Check
           ".gitignore": "6f23ff6842b5526da43ab38f4a5bf3b0158eeb42",
           "package-lock.json": "8db0df575e6509336a6719094b63eb23d2c649c1",
           "package.json": "185771929d92c3865ce06c863c07d357500d3364",
-          "turbo.json": "2b9b71e8eca61cda6f4c14e07067feac9c1f9862"
+          "somefile.txt": "45b983be36b73c0788dc9cbcb76cbb80fc7bb057",
+          "turbo.json": "505752e75c10f9e7a0d2538cf8b6f0fcfb8980a0"
         },
         "expandedOutputs": [],
         "framework": "\u003cNO FRAMEWORK DETECTED\u003e",

cli/integration_tests/single_package/my-pkg/somefile.txt

@@ -0,0 +1 @@
+hi

cli/integration_tests/single_package/my-pkg/turbo.json

@@ -1,5 +1,6 @@
 {
   "$schema": "https://turbo.build/schema.json",
+  "globalDependencies": ["somefile.txt"],
   "pipeline": {
     "build": {
       "outputs": ["foo"]

cli/integration_tests/single_package/run-yarn.t

@@ -0,0 +1,35 @@
+Setup
+  $ . ${TESTDIR}/../setup.sh
+  $ . ${TESTDIR}/setup.sh $(pwd) "yarn@1.22.17"
+  $ rm -rf package-lock.json || true # exists because of setup.sh script above
+  $ yarn install > /dev/null 2>&1
+  $ git commit -am "Update lockfile" # clean git state
+
+Check
+  $ ${TURBO} run build
+  \xe2\x80\xa2 Running build (esc)
+  \xe2\x80\xa2 Remote caching disabled (esc)
+  build: cache miss, executing 13cea0f56e6c743e
+  build: yarn run v1.22.17
+  build: warning package.json: No license field
+  build: $ echo 'building' > foo
+  build: Done in 0.02s.
+
+   Tasks:    1 successful, 1 total
+  Cached:    0 cached, 1 total
+    Time:\s*[\.0-9]+m?s  (re)
+
+
+  $ ${TURBO} run build
+  \xe2\x80\xa2 Running build (esc)
+  \xe2\x80\xa2 Remote caching disabled (esc)
+  build: cache hit, replaying output 13cea0f56e6c743e
+  build: yarn run v1.22.17
+  build: warning package.json: No license field
+  build: $ echo 'building' > foo
+  build: Done in 0.02s.
+
+   Tasks:    1 successful, 1 total
+  Cached:    1 cached, 1 total
+    Time:\s*[\.0-9]+m?s >>> FULL TURBO (re)
+

cli/integration_tests/single_package/run.t

@@ -6,7 +6,7 @@ Check
   $ ${TURBO} run build --single-package
   \xe2\x80\xa2 Running build (esc)
   \xe2\x80\xa2 Remote caching disabled (esc)
-  build: cache miss, executing 7bf32e1dedb04a5d
+  build: cache miss, executing dd4a9a7b508b0e38
   build: 
   build: > build
   build: > echo 'building' > foo
@@ -20,7 +20,7 @@ Run a second time, verify caching works because there is a config
   $ ${TURBO} run build --single-package
   \xe2\x80\xa2 Running build (esc)
   \xe2\x80\xa2 Remote caching disabled (esc)
-  build: cache hit, replaying output 7bf32e1dedb04a5d
+  build: cache hit, replaying output dd4a9a7b508b0e38
   build: 
   build: > build
   build: > echo 'building' > foo

cli/integration_tests/single_package/setup.sh

@@ -4,3 +4,10 @@ SCRIPT_DIR=$(dirname ${BASH_SOURCE[0]})
 TARGET_DIR=$1
 cp -a ${SCRIPT_DIR}/my-pkg/. ${TARGET_DIR}/
 ${SCRIPT_DIR}/../setup_git.sh ${TARGET_DIR}
+
+if [ "$2" != "" ]; then
+  pm="$2"
+  jq --arg pm "$pm" '.packageManager = $pm' "$TARGET_DIR/package.json"
+  # cat "$TARGET_DIR/package.json" | jq ".packageManager=\"$2\"" | sponge "$TARGET_DIR/package.json"
+  git commit -am "Update package manager" --quiet
+fi

cli/internal/packagemanager/yarn.go

@@ -1,6 +1,7 @@
 package packagemanager
 
 import (
+	"errors"
 	"fmt"
 	"os/exec"
 	"path/filepath"
@@ -12,6 +13,13 @@ import (
 	"github.com/vercel/turbo/cli/internal/turbopath"
 )
 
+// NoWorkspacesFoundError is a custom error used so that upstream implementations can switch on it
+type NoWorkspacesFoundError struct{}
+
+func (e *NoWorkspacesFoundError) Error() string {
+	return "package.json: no workspaces found. Turborepo requires Yarn workspaces to be defined in the root package.json"
+}
+
 var nodejsYarn = PackageManager{
 	Name:         "nodejs-yarn",
 	Slug:         "yarn",
@@ -27,7 +35,7 @@ var nodejsYarn = PackageManager{
 			return nil, fmt.Errorf("package.json: %w", err)
 		}
 		if len(pkg.Workspaces) == 0 {
-			return nil, fmt.Errorf("package.json: no workspaces found. Turborepo requires Yarn workspaces to be defined in the root package.json")
+			return nil, &NoWorkspacesFoundError{}
 		}
 		return pkg.Workspaces, nil
 	},
@@ -42,6 +50,12 @@ var nodejsYarn = PackageManager{
 
 		globs, err := pm.getWorkspaceGlobs(rootpath)
 		if err != nil {
+			// In case of a non-monorepo, the workspaces field is empty and only node_modules in the root should be ignored
+			var e *NoWorkspacesFoundError
+			if errors.As(err, &e) {
+				return []string{"node_modules/**"}, nil
+			}
+
 			return nil, err
 		}