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Web Component made with Svelte throws: TypeError: Cannot read properties of undefined (reading '$$') when used in vanilla html #9958

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camstuart opened this issue Dec 19, 2023 · 1 comment
Open

Web Component made with Svelte throws: TypeError: Cannot read properties of undefined (reading '$$') when used in vanilla html #9958

camstuart opened this issue Dec 19, 2023 · 1 comment
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@camstuart
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Describe the bug

Maybe related: #7968

I am using svelte to build web components that I can use in server rendered frameworks, Django in this case.
When I import the web component, I get the error:

Component.js:130 Uncaught TypeError: Cannot read properties of undefined (reading '$$')
    at q (Component.js:130:44)
    at new ht (App.svelte:10:50)
    at main.js:4:13

By exploring the included javascript which thankfully has the source map, I discover it fails at the entry point:

target: document.getElementById('app')

Workaround:
In my 'vanilla html' I added the id="app to the body tag, which solves the issue:

<body class="h-full bg-gray-50" id="app">

Not sure if this is intended or an issue? in any case I wasn't able to find any instructions, so I thought I would post in case others have the same problem.

Fortunately in my case having that id in the body tag is no bother, just took a little while to trouble shoot.

Reproduction

package.json

{
  "name": "web-component-foundry",
  "private": true,
  "version": "0.0.0",
  "type": "module",
  "scripts": {
    "dev": "vite",
    "build": "vite build",
    "preview": "vite preview"
  },
  "devDependencies": {
    "@sveltejs/vite-plugin-svelte": "^3.0.1",
    "svelte": "^4.2.8",
    "vite": "^5.0.8"
  },
  "dependencies": {
    "svelte-preprocess": "^5.1.3"
  }
}

vite.config.js

import { defineConfig } from "vite";
import { svelte } from "@sveltejs/vite-plugin-svelte";
import sveltePreprocess from "svelte-preprocess";

export default defineConfig({
  plugins: [
    svelte({
      preprocess: sveltePreprocess({}),
      exclude: /\.component\.svelte$/,
      emitCss: false,
    }),
    svelte({
      preprocess: sveltePreprocess(),
      include: /\.component\.svelte$/,
      compilerOptions: {
        customElement: true,
      },
      emitCss: false,
    }),
  ],
  build: {
    sourcemap: true,
    target: "modules",
    lib: {
      entry: "src/main.js",
      name: "<<name>>",
      fileName: "components",
    },
  },
});

./lib/StreamSelectPlay.component.svelte

<svelte:options customElement="fireops-radio-stream-player" />

<script lang="js">
    export let name = '';
</script>

<div>
    <h1 class="text-amber-500">Hi from: {name}</h1>
</div>

Generating a web component (Makefile):

npm run build && cp dist/components.* ../web-admin/web-assets/js/

Which invokes:

vite build

Logs

No response

System Info

System:
    OS: macOS 14.2
    CPU: (8) arm64 Apple M2
    Memory: 52.31 MB / 8.00 GB
    Shell: 5.9 - /bin/zsh
  Binaries:
    Node: 20.10.0 - ~/.nvm/versions/node/v20.10.0/bin/node
    npm: 10.2.5 - ~/.nvm/versions/node/v20.10.0/bin/npm
  Browsers:
    Chrome: 120.0.6099.109
    Safari: 17.2
  npmPackages:
    svelte: ^4.2.8 => 4.2.8

Severity

annoyance
@dummdidumm
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Please provide a reproduction repository. What does the entry point main.js look like, what is App.svelte, etc

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@camstuart @dummdidumm