feat: build specific package(s) in monorepos

[enisdenjo]

Running yarn build @graphql-tools/url-loader in graphql-tools would build only the @graphql-tools/url-loader package in packages/loaders/url.

Furthermore, running yarn build @graphql-tools/url-loader @graphql-tools/utils would build only @graphql-tools/url-loader and @graphql-tools/utils.

Do note that the build step won't have a big performance gain due to tsc (which still has to check the whole project). Since monorepos often reference other packages within, isolated tsc builds seem to not be possible.

[changeset-bot]

🦋 Changeset detected

Latest commit: fbf5e9f

The changes in this PR will be included in the next version bump.

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Name	Type
bob-the-bundler	Minor

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[n1ru4l]

@enisdenjo Do we still need this with the incremental build flag (#123 (review))? The only optimization it does right now would be to avoid copying unaffected files. 🤔

Not sure whether this optimization is worth it at this stage.

What do you think?

[enisdenjo]

@n1ru4l you're right, and since we cannot isolate TS to build just one package, there is no speed improvements whatsoever. I'd say #123 is enough for now.