quasarframework/quasar · error

No such App Extension is installed

Error message

No such App Extension is installed

What it means

`quasar run <extId>` (or its alias) looks up an installed Quasar App Extension by its npm-short id. When no such extension is registered in the project, the CLI warns and exits 1. Extensions become available only after being installed via `quasar ext add <extId>`. Note: the message lacks the extension id interpolation — check which id you passed.

Source

Thrown at app-vite/lib/cmd/run.js:45

  Options
    --no-color  Disable colored output
  `)

  process.exit(0)
}

import { log, warn } from '../utils/logger.js'
import { getExtensionLogger } from '../app-extension/logger.js'

import { getCtx } from '../utils/get-ctx.js'

const { appExt } = getCtx()

const ext = appExt.getInstance(extId)
if (ext === void 0) {
  warn()
  getExtensionLogger(extId).warn('No such App Extension is installed')
  warn()
  process.exit(1)
}

const hooks = await ext.run()

const list = () => {
  if (Object.keys(hooks.commands).length === 0) {
    ext.logger.warn(`App Extension has no commands registered`)
    return
  }

  const cmdList = Object.keys(hooks.commands).join(' | ')
  ext.logger.log(`Command list: ${cmdList}`)
}

if (!cmd) {
  list()

View on GitHub (pinned to 4841521b5f)

Solutions

1. Install the extension first: `quasar ext add <extId>`.
2. List installed extensions with `quasar ext list` (or inspect quasar.config > extensions) to confirm the exact id.
3. Check the id spelling against the extension's documentation.

Example fix

// before
quasar run myext cmd
// after
quasar ext add @quasar/myext
quasar run @quasar/myext cmd

// check installed extensions before `quasar run`
const conf = JSON.parse(stripJsonComments(fs.readFileSync('quasar.config.js', 'utf8').replace(/export default[\s\S]*/, '')));
// simpler: verify the package exists
const pkg = `@quasar/${extId}`;
if (!fs.existsSync(`node_modules/${pkg}`)) await exec(`quasar ext add ${extId}`);

try {
  execSync(`quasar run ${extId} ${cmd}`, { stdio: 'inherit' });
} catch (err) {
  if (String(err.stderr).includes('No such App Extension')) {
    execSync(`quasar ext add ${extId}`, { stdio: 'inherit' });
    execSync(`quasar run ${extId} ${cmd}`, { stdio: 'inherit' });
  } else throw err;
}

When it happens

Trigger: Calling `quasar run <extId> [cmd]` where `appExt.getInstance(extId)` returns undefined — the extension package is not installed in the project (run.js:38-45).

Common situations: Typo in the extension id; extension added in another project/branch; forgetting `quasar ext add` after cloning a repo; extension uninstalled but documentation still references `quasar run`.

Related errors

• Wrong number of parameters (${argv._.length}).
• Unknown action specified (${action}).
• No ${mode.toUpperCase()} support detected. Aborting.
• App Extension has no commands registered
• App Extension has no command called "${cmd}"

AI-assisted analysis of quasarframework/quasar@4841521b5f (2026-08-30). Data as JSON: /api/errors/8409fe3e15069069. Report an issue: GitHub.