Apollo GraphQL File Upload Link

apollo-upload-client is a terminating Apollo Link for Apollo Client that facilitates file uploads within GraphQL mutations using the GraphQL multipart request specification. It automatically detects `FileList`, `File`, or `Blob` instances in GraphQL variables and constructs a multipart request, falling back to a standard GraphQL POST or GET request otherwise. The current stable version is 19.0.0, with major versions released somewhat frequently to align with `@apollo/client` updates and Node.js LTS changes. Its primary differentiator is seamless integration with Apollo Client for file uploads, abstracting the multipart request complexity, and adhering to the community-standard GraphQL multipart request specification. It requires a compatible server-side implementation that also follows the specification.