Provide a better error message during pulumi new if no nodejs package…

… manager is installed

changelog/pending/20240501--sdk-nodejs--provide-a-better-error-message-during-pulumi-new-if-no-nodejs-package-manager-is-installed.yaml

@@ -0,0 +1,4 @@
+changes:
+- type: fix
+ scope: sdk/nodejs
+ description: Provide a better error message during pulumi new if no nodejs package manager is installed

sdk/nodejs/npm/manager.go

@@ -2,6 +2,7 @@ package npm
 
 import (
  "context"
+ "errors"
  "fmt"
  "io"
  "os"
@@ -100,8 +101,8 @@ func ResolvePackageManager(pwd string) (PackageManager, error) {
  // Finally, fall back to npm.
  node, err := newNPM()
  if err != nil {
- return nil, fmt.Errorf("could not find npm on the $PATH; npm is installed with Node.js "+
- "available at https://nodejs.org/: %w", err)
+ return nil, errors.New("could not find npm on the $PATH; make sure npm is installed and run " +
+ "'pulumi install' to complete the project setup")
  }
 
  return node, nil