denoland/deno · error

an internal error occurred

Error message

an internal error occurred

What it means

In `deno info`, the root specifier resolved successfully, the graph did not report an error for it, yet try_get returned Ok(None) — the module is neither present nor errored. This state is unreachable by construction, so the code bails with a generic internal-error marker. It signals a bug in Deno's graph bookkeeping, not a user mistake.

Source

Thrown at cli/tools/info.rs:616

          writer,
          "{} {}",
          colors::bold("size:"),
          display::human_size(total_size),
        )?;
        writeln!(writer)?;
        let root_node = self.build_module_info(root, false);
        root_node.print(writer)?;
        Ok(())
      }
      Err(err) => {
        if let ModuleErrorKind::Missing { .. } = err.as_kind() {
          bail!("module could not be found");
        } else {
          bail!("{:#}", err);
        }
      }
      Ok(None) => {
        bail!("an internal error occurred");
      }
    }
  }

  fn build_dep_info(&mut self, dep: &Dependency) -> Vec<DisplayTreeNode> {
    let mut children = Vec::with_capacity(2);
    if !dep.maybe_code.is_none()
      && let Some(child) = self.build_resolved_info(&dep.maybe_code, false)
    {
      children.push(child);
    }
    if !dep.maybe_type.is_none()
      && let Some(child) = self.build_resolved_info(&dep.maybe_type, true)
    {
      children.push(child);
    }
    children
  }

View on GitHub (pinned to 9ad36f7a2c)

Solutions

1. Update to the latest stable Deno release
2. If reproducible, file an issue at github.com/denoland/deno/issues with the specifier, deno.json, and `deno --version` output

Treat 'an internal error occurred' from deno info as a Deno bug: retry after updating Deno (`deno upgrade`); if it persists, capture `deno --version` and the specifier and file an issue.

When it happens

Trigger: Requires graph.resolve() and graph.try_get() to disagree about the root module — only possible via an internal graph-construction bug or memory/logic corruption; there is no CLI input that legitimately produces it.

Common situations: Practically never seen; if it appears, it is usually on pre-release/nightly builds where graph invariants were recently changed.

Related errors

• displaying graphs that have multiple roots is not supported.
• ${name} is already registered
• JS PANIC: {}
• Formatting succeeded initially, but failed when ensuring a s
• Formatting not stable. Bailed after {} tries. This indicates

AI-assisted analysis of denoland/deno@9ad36f7a2c (2026-08-20). Data as JSON: /api/errors/2916adbe96c04a0c. Report an issue: GitHub.