hashicorp/terraform · critical

unknown view type %v

Error message

unknown view type %v

What it means

This panic fires in NewModules when arguments.ViewType is neither ViewJSON nor ViewHuman. ViewType is `type ViewType rune`; the modules switch has no case for ViewNone(0) or ViewRaw('R').

Source

Thrown at internal/command/views/modules.go:32

	"github.com/xlab/treeprint"
)

type Modules interface {
	// Display renders the list of module entries.
	Display(manifest moduleref.Manifest) int

	// Diagnostics renders early diagnostics, resulting from argument parsing.
	Diagnostics(diags tfdiags.Diagnostics)
}

func NewModules(vt arguments.ViewType, view *View) Modules {
	switch vt {
	case arguments.ViewJSON:
		return &ModulesJSON{view: view}
	case arguments.ViewHuman:
		return &ModulesHuman{view: view}
	default:
		panic(fmt.Sprintf("unknown view type %v", vt))
	}
}

type ModulesHuman struct {
	view *View
}

var _ Modules = (*ModulesHuman)(nil)

func (v *ModulesHuman) Display(manifest moduleref.Manifest) int {
	if len(manifest.Records) == 0 {
		v.view.streams.Println("No modules found in configuration.")
		return 0
	}
	printRoot := treeprint.New()

	// ensure output is deterministic
	sort.Sort(manifest.Records)

View on GitHub (pinned to d32a084675)

Solutions

1. Set ViewType explicitly to arguments.ViewHuman or arguments.ViewJSON in any test calling NewModules.
2. Add a case for any new ViewType to views/modules.go:32 (and all sibling New* constructors).
3. Run `go test ./internal/command/views/` after changes to arguments/types.go.

Example fix

// before
mt := arguments.Modules{} // ViewType == ViewNone
v := views.NewModules(mt.ViewType, view)
// after
mt := arguments.Modules{ViewType: arguments.ViewHuman}
v := views.NewModules(mt.ViewType, view)

switch vt {
case arguments.ViewHuman, arguments.ViewJSON:
  // ok
default:
  return fmt.Errorf("unsupported modules view type: %v", vt)
}

func isValidModulesViewType(vt arguments.ViewType) bool {
  return vt == arguments.ViewHuman || vt == arguments.ViewJSON
}

When it happens

Trigger: `terraform providers` / modules-listing command invoked with a ViewType the modules constructor does not recognize: zero-value ViewType (test code skipping flag parsing), ViewRaw passed to modules (not supported), or a future enum value without a matching case.

Common situations: A test builds a Modules view with the default zero ViewType. A maintainer adds a ViewType and forgets to extend NewModules. End users cannot trigger it via flags (parsing only yields ViewHuman or ViewJSON).

Related errors

• unknown view type %v
• unknown view type %v
• unknown view type %v
• unknown view type %v
• unknown view type %v

AI-assisted analysis of hashicorp/terraform@d32a084675 (2026-08-11). Data as JSON: /api/errors/74094287a1811c37. Report an issue: GitHub.