[swift-evolution] Proposal Discussion Thread: SwiftPM: Locking and Overriding Dependencies

[Max Howell]

> <https://github.com/apple/swift-package-manager/blob/master/Documentation/Internals/SwiftBasedManifestFormat.md#discussion <https://github.com/apple/swift-package-manager/blob/master/Documentation/Internals/SwiftBasedManifestFormat.md#discussion>>
> 
>> We decided to use a Swift-based format for the manifest because we believe it gives developers the best experience for working with and describing their project. The primary alternative we considered was to use a declarative format encoded in a common data format like JSON. Although that would simplify implementation of the tooling around the manifest, it has the downside that users must then learn this additional language, and the development of high quality tools for that (documentation, syntax coloring, parsing diagnostics) isn't aligned with our goal of building great tools for Swift. In contrast, using the Swift language means that we can leverage all of the work on Swift to make those tools great.
> 
> 
> Could you generate a similar Swift-based format for the lockfile?

The file is not meant to be user edited and JSON would make the data more accessible to other tooling.

We’d go with Swift again if there were concrete reasons for it.
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