Could not find a declaration file for module 'luxon'

[vajkayrene]

Description

The following error message is thrown from the cron module (using Typescript):

node_modules/cron/types/index.d.ts:11:26 - error TS7016: Could not find a declaration file for module 'luxon'. '/api/node_modules/luxon/build/node/luxon.js' implicitly has an 'any' type.
  Try `npm i --save-dev @types/luxon` if it exists or add a new declaration (.d.ts) file containing `declare module 'luxon';`

The issue is caused by a missing type definition for the luxon library. The docs for the library states it should be installed as a developer dependency separately for typescript.

Screenshots

Additional information

No response

[sheerlox]

You're absolutely right! Typescript cached a version of @types/luxon on my machines, so I didn't notice that error, thank you for reporting the issue!

[vajkayrene]

You're absolutely right! Typescript cached a version of @types/luxon on my machines, so I didn't notice that error, thank you for reporting the issue!

Yes, I had the same issue. 😄 Typescript cached the library on my local machine and I was scratching my head for 30 minutes about why it fails on the CI/CD server.

[sheerlox]

If we'd add @types/luxon to this project, it would need to be added to the regular dependencies, so it would be installed for all users (even JS ones). The issue is that the package size is 115 kB while cron is only 59.2 kB.
Would you find installing the @types/cron package in your development dependencies a good solution until we convert the library to TS? If so I'll update the README to include a section about this.

[sheerlox]

On the other hand luxon is 4.06 MB so I guess adding 115 kB is not the end of the world

[vajkayrene]

If we'd add @types/luxon to this project, it would need to be added to the regular dependencies, so it would be installed for all users (even JS ones). The issue is that the package size is 115 kB while cron is only 59.2 kB. Would you find installing the @types/cron package in your development dependencies a good solution until we convert the library to TS? If so I'll update the README to include a section about this.

I tried to install @types/cron, but the fact is typescript still gives me the original issue. I was able to fix it by installing @types/luxon to my devDependecies.

[sheerlox]

I'm sorry I made a mistake in my message, I meant @types/luxon indeed 😅
@types/cron is deprecated since we imported their types and now ship them directly within cron.

[sheerlox]

I've made a PR to add @types/luxon to our dependencies, it should be merged soon :) thanks for the heads up!

[vajkayrene]

No problem, thanks for the quick fix!