Fix dynamic import of modules with inlined imports

[comp500]

↪️ Pull Request

When dynamically importing a module that itself has an inlined import (e.g. with bundle-text) a module loader is added for the inlined bundle, which references a file that is not generated (since it is inlined). This invalid reference causes the import to fail at runtime if the fetch fails before the correct import resolves; it appears to also cause a TypeError ("Cannot read properties of undefined") in tests.

This fix simply excludes external bundles in getLoaderRuntime that have a bundleBehavior of inline.

💻 Examples

From the unit test code:

asyncTransitive.js:

export default import("./inline.js");

inline.js:

import otherHTML from "bundle-text:./inline.html"
export default otherHTML;

inline.html:

<p>test</p>
<script>console.log('hi')</script>

asyncTransitive.js is used as an entry point; generates 2 invalid references:

// ...
module.exports = Promise.all([
    require("./helpers/browser/js-loader")(require("./helpers/bundle-url").getBundleURL("gfgQn") + "inline.4243f809.js" + "?" + Date.now()).catch((err)=>{ /* ... */ }),
    require("./helpers/browser/html-loader")(require("./helpers/bundle-url").getBundleURL("gfgQn") + "inline.0dc63d1b.html" + "?" + Date.now()).catch((err)=>{ /* ... */ }}),
    require("./helpers/browser/js-loader")(require("./helpers/bundle-url").getBundleURL("gfgQn") + "inline.03c983ec.js" + "?" + Date.now()).catch((err)=>{ /* ... */ })
]).then(()=>module.bundle.root("5L8Sl"));
// ...

(inline.4243f809.js and inline.0dc63d1b.html don't exist)

🚨 Test instructions

N/A (unit test added)

✔️ PR Todo

• Added/updated unit tests for this change
• Filled out test instructions (In case there aren't any unit tests)
• Included links to related issues/PRs

[oe]

Confirmed issue! Nice mr!

This mr can fix error like this(caused by invalid references)

but still not working when inlined module is a web worker, here is a demo https://stackblitz.com/edit/github-fshd7k-xtd4gl?file=src/app.js can reproduce this issue:

1. download project (stackblitz not working online due to lack of supporting of native node modules)
   

2. install and run project yarn && yarn dev

3. open browser and open devtools, check logs in console

[comp500]

I can't seem to reproduce that issue with my change, I just get the compiled bundle of worker.js in the log:

The worker itself doesn't run in development because Parcel doesn't know that the module is intended to be a web worker (as you're not using the intended syntax) so it emits the HMR runtime code, which isn't compatible with web workers. Running in production with the files produced from parcel build works fine.