Handle a workaround big.js ESM import

[jstasiak]

Big.js can't be imported as-is in ESM mode[1] but there's a workaround:
it can be imported as 'big.js/big.mjs'. The unfortunate downside of this
is the lack of type coverage, which this patch aims to rectify.

[1] MikeMcl/big.js#170

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[typescript-bot]

@jstasiak Thank you for submitting this PR! I see this is your first time submitting to DefinitelyTyped 👋 — I'm the local bot who will help you through the process of getting things through.

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1 package in this PR

• big.js — on npm, on unpkg
  • Config files to check:
    • big.js/OTHER_FILES.txt: not the expected form

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---

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[typescript-bot]

🔔 @nycdotnet @Ky6uk — please review this PR in the next few days. Be sure to explicitly select Approve or Request Changes in the GitHub UI so I know what's going on.

[typescript-bot]

@jstasiak The CI build failed! Please review the logs for more information.

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[typescript-bot]

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[jstasiak]

CI failed for unrelated reason, errors present in the master branch: https://dev.azure.com/definitelytyped/DefinitelyTyped/_build/results?buildId=131089&view=logs&j=8635df7d-ecde-52a7-c7a8-84b998e35690&t=c264d665-0b79-59b7-7e04-9965cbe74860

[amcasey]

Typo? It's unusual to import from an absolute path.

[jstasiak]

You're absolutely right, fixed

[typescript-bot]

@jstasiak One or more reviewers has requested changes. Please address their comments. I'll be back once they sign off or you've pushed new commits. Thank you!

[typescript-bot]

@amcasey Thank you for reviewing this PR! The author has pushed new commits since your last review. Could you take another look and submit a fresh review?

[amcasey]

To be honest, this seems like a bit of a hack. Having said that, it's modelling a hack in the underlying library, so it's probably okay? Thoughts, @nycdotnet @Ky6uk?

[jstasiak]

For what it's worth big.js 6.2.0 has been released and it can be imported in ESM code just fine now so I'll close this PR.