Web Extension Transformer: esmodule-helpers.js fails to load

[fregante]

• Follows Add support for Web Extension manifest V3 #7050

🐛 bug report

My options page isn't being built correctly. Opening the options page in the browser results into this line failing:

var parcelHelpers = require("@parcel/transformer-js/src/esmodule-helpers.js");

and the console error:

options.6f3d3386.js:63 Uncaught Error: Cannot find module '8ISrk'
    at newRequire (options.6f3d3386.js:61:19)
    at newRequire (options.6f3d3386.js:45:18)
    at localRequire (options.6f3d3386.js:84:35)
    at Object.3fApi.webextension-polyfill (options.6f3d3386.js:146:21)
    at newRequire (options.6f3d3386.js:71:24)
    at options.6f3d3386.js:122:5
    at options.6f3d3386.js:145:3

🎛 Configuration (.babelrc, package.json, cli command)

{
	"extends": "@parcel/config-webextension"
}

	"browserslist": [
		"last 1 Chrome version",
		"last 1 Firefox version"
	],

💻 Code Sample

The content of options.js is just:

import browser from 'webextension-polyfill';

and part of the output is:

})({"3fApi":[function(require,module,exports) {
var parcelHelpers = require("@parcel/transformer-js/src/esmodule-helpers.js");
var _webextensionPolyfill = require("webextension-polyfill");
var _webextensionPolyfillDefault = parcelHelpers.interopDefault(_webextensionPolyfill);

},{"webextension-polyfill":"kPFTQ","@parcel/transformer-js/src/esmodule-helpers.js":"8ISrk"}],"kPFTQ":[function(require,module,exports) {

Full example in https://github.com/fregante/browser-extension-template/pull/75/files

🌍 Your Environment

Software	Version(s)
Parcel	2.0.0-nightly.1049
parcel/config-webextension	2.4.2-nightly.2674
Node	v16.4.2
npm/Yarn	7.18.1
Operating System	macOS 11