Question 1

How do I set up authentication headers with elm-graphql?

Accepted Answer

Use the --header flag when running the CLI tool to include headers like Bearer tokens during code generation, and ensure your HTTP requests in Elm pass these headers, as mentioned in the setup instructions.

Question 2

elm-graphql vs other Elm GraphQL libraries like graphql-to-elm?

Accepted Answer

elm-graphql is the only library that provides full type safety by generating code from the entire schema, whereas others may rely on runtime checks or manual decoders, offering better correctness guarantees but with code generation overhead.

Question 3

How to handle real-time updates with elm-graphql subscriptions?

Accepted Answer

Generate subscription code using the CLI, then set up WebSocket connections via Elm ports with JavaScript, as detailed in the subscription example and demo—this requires external wiring beyond the generated Elm code.

Question 4

Can I use elm-graphql with a local GraphQL schema file?

Accepted Answer

Yes, point the CLI tool to a local schema file or introspection endpoint; it supports various inputs, but you'll need to ensure the schema is accessible during code generation, similar to the remote endpoint examples.

Question 5

How to update generated code when the GraphQL schema changes?

Accepted Answer

Re-run the elm-graphql CLI tool with the same arguments to regenerate the Elm modules; this is necessary to keep type safety, but it can break existing code if schema changes are incompatible.

Question 6

Does elm-graphql support custom scalar types?

Accepted Answer

Yes, through Scalar Codecs, allowing you to define how custom GraphQL scalars are encoded and decoded in Elm, providing flexibility for complex data types as highlighted in the tutorial resources.

elm-graphql

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