Add types for `require.context`

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Assessment

Research direction

Description

Do you want to request a feature or report a bug?

Feature request

Currently, Metro supports require.context, added in this PR, but it lacks built-in type definitions. This makes it more challenging to use require.context effectively as there's no code completion, error checking, or refactoring support for its arguments.

Property 'context' does not exist on type 'NodeRequire'.

Right now, I have to create a types file and add the following content from @EvanBacon's Metro-Context-Modules-Demo repo, having them included by default in Metro would be a great improvement.

Including type definitions for require.context would significantly improve the developer experience by enabling these features and making code using require.context more robust and maintainable.

Getting set up

First steps

1. Read the whole issue, then the project's contributing guide.
2. Comment on the issue to say you are picking it up — it saves two people doing the same work.
3. Fork the repository and make your change on a branch.
4. Open a pull request that references the issue number.

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