Stuck on an issue?

Lightrun Answers was designed to reduce the constant googling that comes with debugging 3rd party libraries. It collects links to all the places you might be looking at while hunting down a tough bug.

And, if you’re still stuck at the end, we’re happy to hop on a call to see how we can help out.

Nested import error: TypeError: "header.$$ is undefined".

See original GitHub issue

🐛 Bug Report

Nested import error: TypeError: "header.$$ is undefined". Without import app works normally, with import I get this error.

🎛 Configuration

{
  "name": "sveltetest",
  "version": "1.0.0",
  "description": "",
  "main": "index.html",
  "scripts": {
    "test": "echo \"Error: no test specified\" && exit 1"
  },
  "browserslist": [
    "last 1 chrome versions",
    "last 1 firefox version"
  ],
  "author": "Janealter",
  "license": "ISC",
  "devDependencies": {
    "@babel/polyfill": "^7.4.4",
    "parcel-bundler": "^1.12.3",
    "parcel-plugin-svelte": "^3.0.1",
    "svelte": "^3.4.4"
  }
}

Commands: ./node_modules/parcel-bundler/bin/cli.js index.html --no-cache; ./node_modules/parcel-bundler/bin/cli.js index.html; parcel index.html; parcel index.html --no-cache

💻 Code Sample

./index.html

<!DOCTYPE html> 
<html lang="en">
  <head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <title>Svelte Test</title>
  </head>
  <body>
    <main></main>
    <script src="src/index.js"></script>
  </body>
</html>

./src/index.js

import '@babel/polyfill';
import App from './App';

const app = new App({
  target: document.querySelector('main'),
  data: {},
});

./src/App.svelte

<script>
  import Header from './components/Header';

  const name = 'Test';
</script>

<p>{name}</p>
<Header/>

./src/components/Header.svelte

<header>
  <p>Test text</p>
</header>

🌍 Your Environment

Svelte 3.4.4, Parcel 1.12.3

Issue Analytics

State:
Created 4 years ago
Reactions:2
Comments:7 (2 by maintainers)

Top GitHub Comments

3reactions

orlov-vocommented, Jul 9, 2019

yes, it’s problem related with HMR. you can use simple workaround with disabling hot reloading: parcel --no-hmr index.html

2reactions

hectorlfcommented, Jul 6, 2019

Just in case this helps, as it is not explicitly mentioned. I’m seeing:

TypeError: Cannot read property ‘fragment’ of undefined at Object.c (Hello.svelte:117)

With the most simplest nested component. The thing is that this only happens when running “parcel” or “parcel watch”, running “parcel build” generates a correct output.

parcel: 1.12.3 parcel-plugin-svelte: 3.0.1 svelte: 3.6.4