itwanger/toBeBetterJavaer · error · Error

Missing value for ${argv[index]}

Error message

Missing value for ${argv[index]}

What it means

Thrown by requireValue() in scripts/convert-mdnice-images-to-cdn.js when a value-taking option (--env, --domains, --prefix, --concurrency, --limit) is the last token or its next token starts with '-'. The parser refuses to consume a following flag as a value, so the option is left without an argument and the script aborts before doing any work.

Source

Thrown at scripts/convert-mdnice-images-to-cdn.js:109

      options.limit = parsePositiveInt(arg.slice("--limit=".length), "--limit");
    } else if (arg.startsWith("-")) {
      throw new Error(`Unknown option: ${arg}`);
    } else {
      options.targets.push(path.resolve(ROOT_DIR, arg));
    }
  }

  if (options.targets.length === 0) {
    options.targets.push(DEFAULT_TARGET);
  }

  return options;
}

function requireValue(argv, index) {
  const value = argv[index + 1];
  if (!value || value.startsWith("-")) {
    throw new Error(`Missing value for ${argv[index]}`);
  }
  return value;
}

function parseList(value) {
  return value
    .split(",")
    .map((item) => item.trim())
    .filter(Boolean);
}

function parsePositiveInt(value, optionName) {
  const parsed = Number.parseInt(value, 10);
  if (!Number.isFinite(parsed) || parsed <= 0) {
    throw new Error(`${optionName} must be a positive integer`);
  }
  return parsed;
}

View on GitHub (pinned to 6617f5fd0b)

Solutions

1. Supply the missing value: `--limit 10` or use the equals form `--limit=10`
2. If the intended value genuinely starts with '-', restructure it (absolute path) so it does not
3. Prefer the `--option=value` form to make flag/value pairing unambiguous

Example fix

// before
node scripts/convert-mdnice-images-to-cdn.js --limit --write

// after
node scripts/convert-mdnice-images-to-cdn.js --limit=10 --write

// Pre-flight: pair every value-taking flag with a non-dash value
const VALUE_OPTS = ["--env", "--domains", "--prefix", "--concurrency", "--limit"];
for (let i = 0; i < args.length; i++) {
  if (VALUE_OPTS.includes(args[i]) && (!args[i + 1] || args[i + 1].startsWith("-"))) {
    throw new Error(`${args[i]} needs a value; use ${args[i]}=value`);
  }
}

catch (err) { if (err.message.startsWith("Missing value for")) { console.error(`Supply a value: use the equals form shown in --help`); process.exit(2); } throw err; }

When it happens

Trigger: `--limit` as the last argument (`node scripts/convert-mdnice-images-to-cdn.js --limit`), or `--prefix --write` where the value position is occupied by another flag. Also `--domains -foo` — any next token beginning with '-' is rejected even if it was meant as a value.

Common situations: Forgetting the value entirely; reordering flags so a value-taking option lands right before another flag; trying to pass a value that itself starts with '-' (e.g. a relative-ish path). Note the `--opt=value` form avoids the check entirely.

Related errors

• Unknown option: ${arg}
• Unknown option: ${arg}
• --route and --dir must be used together
• Missing value for ${argv[index]}
• ${optionName} must be a positive integer

AI-assisted analysis of itwanger/toBeBetterJavaer@6617f5fd0b (2026-08-14). Data as JSON: /api/errors/fd9bd6e0a1c18dba. Report an issue: GitHub.