Problem using `browser-fs-access` in jest

Hi There,

I’m using jest for testing and having trouble with importing the browser-fs-access library.

    Jest encountered an unexpected token

    This usually means that you are trying to import a file which Jest cannot parse, e.g. it's not plain JavaScript.

    By default, if Jest sees a Babel config, it will use that to transform your files, ignoring "node_modules".

    Here's what you can do:
     • To have some of your "node_modules" files transformed, you can specify a custom "transformIgnorePatterns" in your config.
     • If you need a custom transformation specify a "transform" option in your config.
     • If you simply want to mock your non-JS modules (e.g. binary assets) you can stub them out with the "moduleNameMapper" config option.

    You'll find more details and examples of these config options in the docs:
    https://jestjs.io/docs/en/configuration.html

    Details:

    <root>/node_modules/browser-fs-access/dist/index.js:2
    export { fileOpen } from "./file-open.mjs";
    ^^^^^^

    SyntaxError: Unexpected token 'export'

This seems to be a common issue, documented here: https://github.com/facebook/jest/issues/2550, however, the common solutions don’t work.

I tried to use the following configuration parameter to account for presence of mjs files but still getting the same error. Any thoughts on how to allow jest to successfully compile browser-fs-access?

 "transformIgnorePatterns": [
   "node_modules/(?!browser-fs-access).+(js|jsx|mjs|ts)$"
 ]

[Amatewasu]

It looks like using @Pet3ris’ solution after upgrading to browser-fs-access v0.18.1 solves the issue. (#55)

I tried to use the following configuration parameter to account for presence of mjs files but still getting the same error. Any thoughts on how to allow jest to successfully compile browser-fs-access?

 "transformIgnorePatterns": [
   "node_modules/(?!browser-fs-access).+(js|jsx|mjs|ts)$"
 ]

[tomayac]

Sorry, I’m not familiar with Jest, but https://github.com/facebook/jest/issues/2550#issuecomment-810144368 is the right place to ask your question.