quasarframework/quasar · error

Wrong number of parameters

Error message

Wrong number of parameters (${argv._.length}).

What it means

The 'quasar ext' CLI accepts either no parameters (list extensions) or exactly two (an action and an extension name). Any other parameter count prints this warning, shows help, and exits with code 1. It is a usage guard, not a runtime failure.

Solutions

1. Supply exactly two parameters: 'quasar ext <add|remove|invoke|uninvoke> <ext-name>'.
2. Run 'quasar ext' with no arguments to list installed extensions.
3. Run 'quasar ext --help' to see accepted usage.

Example fix

// before
quasar ext add
// after
quasar ext add @quasar/icon-genie

// validate arity before invoking the CLI
const args = ['ext', 'add', '@quasar/qmarkdown'];
const rest = args.slice(1);
if (rest.length !== 0 && rest.length !== 2) {
  throw new Error('quasar ext takes 0 or 2 params: [<action> <extName>]');
}

When it happens

Trigger: Running 'quasar ext' with 1 parameter (e.g. 'quasar ext add'), or 3+ parameters (e.g. 'quasar ext add my-ext extra').

Common situations: Forgetting the extension name after the action ('quasar ext invoke'), pasting extra args from docs, or scripting the CLI with the wrong arity.

Understand the failure class

Background: "Unknown argument", "Invalid value", and "must be one of": invalid CLI argument errors explained — this error's family across 35 libraries.

Related errors

• Unknown action specified
• Wrong number of parameters
• App Extension has no command called
• App Extension has no commands registered
• ERR_PARSE_ARGS_UNKNOWN_OPTION

AI-assisted analysis of quasarframework/quasar@4841521b5f (2026-08-30). Data as JSON: /api/errors/fa540a0aa62a969b. Report an issue: GitHub.

Appendix: source

Thrown at app-vite/lib/cmd/ext.js:49

  Options
    --no-color   Disable colored output
    --help, -h   Displays this message
  `)
}

if (argv.help) {
  showHelp()
  argv.__warn?.()
  process.exit(0)
}

import { log, warn, dot } from '../utils/logger.js'
import { green } from 'kolorist'

if (argv._.length !== 0 && argv._.length !== 2) {
  console.log()
  warn(`Wrong number of parameters (${argv._.length}).`)
  showHelp()
  process.exit(1)
}

const { getCtx } = await import('../utils/get-ctx.js')
const { appExt } = getCtx({
  mode: 'spa',
  debug: false,
  prod: true
})

if (argv._.length === 0) {
  if (appExt.extensionList.length === 0) {
    log(' No App Extensions are installed')
    log(' You can look for "quasar-app-extension-*" in npm registry.')
  } else {
    console.log('Installed App Extensions:')

View on GitHub (pinned to 4841521b5f)