denoland/deno · error

Did not format non-workspace directory. Run again specifying

Error message

Did not format non-workspace directory. Run again specifying the current directory (ex. `deno fmt .`)

What it means

Thrown by `deno fmt` when it is run with no path arguments in a directory that is not part of a Deno workspace (no deno.json/deno.jsonc at or above the cwd). Deno warns that the entire directory will be formatted and asks for confirmation; if the prompt is declined, or stdin is not an interactive TTY so the confirm call returns false, formatting is aborted with this bail.

Source

Thrown at cli/tools/fmt.rs:235

    || cli_options.workspace().package_jsons().next().is_some()
  {
    return Ok(());
  }

  let confirm_result =
    util::console::confirm(util::console::ConfirmOptions {
      default: true,
      message: format!(
        "{} It looks like you're not in a workspace. Are you sure you want to format the entire '{}' directory?",
        colors::yellow("Warning"),
        cli_options.initial_cwd().display()
      ),
    })
    .unwrap_or(false);
  if confirm_result {
    Ok(())
  } else {
    bail!(
      "Did not format non-workspace directory. Run again specifying the current directory (ex. `deno fmt .`)"
    )
  }
}

async fn format_files(
  caches: &Arc<Caches>,
  cli_options: &Arc<CliOptions>,
  fmt_flags: &FmtFlags,
  paths_with_options_batches: Vec<PathsWithOptions>,
) -> Result<(), AnyError> {
  let formatter: Box<dyn Formatter> = if fmt_flags.check {
    let fail_fast = fmt_flags.fail_fast || cli_options.is_quiet();
    Box::new(CheckFormatter::new(fail_fast))
  } else {
    Box::new(RealFormatter::default())
  };
  let editorconfig_cache = Arc::new(EditorConfigCache::new());

View on GitHub (pinned to 9ad36f7a2c)

Solutions

1. Run `deno fmt .` (or `deno fmt <path>`) — an explicit path skips the confirmation entirely
2. Create a deno.json or deno.jsonc at the project root so the directory becomes a workspace
3. cd into the actual project directory before running `deno fmt`

Example fix

# before
deno fmt   # not in a workspace, prompt auto-declines in CI

# after
deno fmt .  # explicit path, no prompt

# or make the directory a workspace:
echo '{ "fmt": {} }' > deno.json

# in scripts/CI, always pass an explicit path and require a workspace config:
test -f deno.json || test -f deno.jsonc || { echo 'no deno.json: create one first'; exit 1; }
deno fmt .   # explicit path never triggers the confirmation

When it happens

Trigger: Running bare `deno fmt` outside any workspace and answering 'n' to the yellow warning prompt; running `deno fmt` in CI or in a script where stdin is a pipe (not a TTY), so util::console::confirm resolves to its unwrap_or(false) default; running fmt from a parent/home directory that has no deno config.

Common situations: Fresh projects without a deno.json yet; running fmt from the wrong shell cwd; CI pipelines where the confirmation prompt cannot be answered and silently auto-declines.

Related errors

• No target files found.
• Missing bench function
• Unexpected 'fn' field in options, bench function is already
• Bench attempted to exit with exit code: ${exitCode}
• Invalid type for fetch: must be a function

AI-assisted analysis of denoland/deno@9ad36f7a2c (2026-08-20). Data as JSON: /api/errors/cb08d617047dafab. Report an issue: GitHub.