Support for.graphql/yaml schemas

[arthens]

We are writing a client for a backend that only provides provides schema.graphql (extracted using https://github.com/graphcool/graphql-cli ) and no schema.json, but if we try to use this schema with apollo-codegen we get a parse error

> apollo-codegen generate src/**/*.graphql --schema schema.graphql --target typescript --output schema.ts

(function (exports, require, module, __filename, __dirname) { schema {
                                                                     ^
SyntaxError: Unexpected token {

Does apollo-codegen only support JSON schemas? Any plan to support .graphql schemas in future?

[martijnwalraven]

You can convert a schema.graphql schema file to schema.json using:

apollo-codegen introspect-schema schema.graphql --output schema.json

But it probably makes sense to support schema.graphql as is, especially as more tools start supporting it. We may also want to integrate with graphql-cli directly.

[arthens]

But it probably makes sense to support schema.graphql as is, especially as more tools start supporting it.

This would be nice, particularly because the .graphql is more human readable.

We may also want to integrate with graphql-cli directly.

Their -w is quite handy. It'd be nice to be able to say "poll for the schema and run apollo-codegen if the schema has changed".

[mike-marcacci]

Another really clean solution would be to let introspect-schema write to stdout and let generate read from stdin; that way you could easily pipe them together.