Error when using passthrough

[andrew-paterson]

I get the following error if I add passthrough to my server config.

For context this is on an Ember 5.11 app, with ember-mirage. If passthrough is removed, everything works great.

    at eval (webpack://__ember_auto_import__/./node_modules/.pnpm/mirage-msw@0.2.2/node_modules/mirage-msw/dist/msw-config.cjs?:61:24)
    at Array.forEach (<anonymous>)
    at createPassthroughRegistry (webpack://__ember_auto_import__/./node_modules/.pnpm/mirage-msw@0.2.2/node_modules/mirage-msw/dist/msw-config.cjs?:60:17)
    at PassthroughRegistry.add (webpack://__ember_auto_import__/./node_modules/.pnpm/mirage-msw@0.2.2/node_modules/mirage-msw/dist/msw-config.cjs?:86:33)
    at eval (webpack://__ember_auto_import__/./node_modules/.pnpm/mirage-msw@0.2.2/node_modules/mirage-msw/dist/msw-config.cjs?:381:27)
    at Array.forEach (<anonymous>)
    at MswConfig.passthrough (webpack://__ember_auto_import__/./node_modules/.pnpm/mirage-msw@0.2.2/node_modules/mirage-msw/dist/msw-config.cjs?:376:11)
    at Server.passthrough (webpack://__ember_auto_import__/./node_modules/.pnpm/miragejs@0.2.0-alpha.3/node_modules/miragejs/dist/mirage.cjs?:6463:35)
    at Server.routes (http://localhost:6202/assets/ember-5-11-0-app.js:755:14)
    at Server.loadConfig (webpack://__ember_auto_import__/./node_modules/.pnpm/miragejs@0.2.0-alpha.3/node_modules/miragejs/dist/mirage.cjs?:6457:13)```

[IanVS]

Can you share the code you are using or better yet a minimal reproduction?

[andrew-paterson]

Sure thing: https://github.com/andrew-paterson/mirage-msw-passthrough

I've managed to work out that Ember is building the app using the require export in package.json, even though mirage-msw is included via an import statement. Thus, the browser is trying to use the code from /dist/msw-config.cjs. I'm not sure why this is, but I've asked about it here.

I created and tested a non Ember app, using a basic webpack config, and that bundled the assets using the correct file (/dist/msw-config.js).

As another test, I also changed the require export in package.json to /dist/msw-config.js for the Ember app and then the error went away.

[IanVS]

@bgantzler you're an ember user, right? Do you have any insights here?

[cah-brian-gantzler]

Yes, I am an ember user, but am not using the msw. This seems to be in the build process. based on the above statement that changing the extenstion from .cjs to .js made the error go away it is outside my understanding of how things work. Hoping Ed may have some insight since it appears to be an auto import issue.

[andrew-paterson]

After moving from classic Ember builds to Embroider, I can confirm that the error no longer occurs, with the correct entry point being used. I'm happy to close this issue, as this is clearly more to do with Ember than with this project.