Add sdl download ability to client:download-schema

[essaji]

TODO:

• Update CHANGELOG.md* with your change (include reference to issue & this PR)
• Make sure all of the significant new logic is covered by tests
• Rebase your changes on master so that they can be merged easily
• Make sure all tests and linter rules pass

Using one of followings:

• client:download-schema filename.graphql
• client:download-schema filename.graphqls
• client:download-schema filename.gql

will download graphql schema in SDL format

Related issue: #1408

[apollo-cla]

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[FabHof]

I was just wondering why this is not possible. Can we get a release with this soon?

[essaji]

@jgzuke client:codegen › writes types for typescript with a custom extension test is failing in my PR. Do we need to re-trigger the build?

[nhusher]

Is there anything blocking this being merged? It will make some of my team's development tooling much simpler.

[JakeDawkins]

I know this wasn't discussed in the original issue, but why not use the file extension to determine what format to save in?

I think the output could be something like my-types.graphql and it could recognize the file extension and know the output format is SDL. I think we could also allow for .gql, .graphqls for sdl formatting

Also, editing the readme directly doesn't work, you need to edit the flag descriptions in the source. That section of the readme is generated :)

[essaji]

@JakeDawkins that was a good idea, I have updated the code accordingly. And yeah I was wondering why updating readme file was causing to break the tests 😄 thanks for letting me know.

[JakeDawkins]

nice! One last change, and this should be good to go! Can you change the description of the output arg to mention the filetypes, like

Path to write the introspection result to. Can be `.graphql`, `.gql`, `.graphqls`, or `.json`

[essaji]

@JakeDawkins Description updated

[JakeDawkins]

Woo! Thanks @essaji :) I'll get this out in the next release in the next day or two!

[bkniffler]

Its been a few weeks now, is there any info when we can expect this to be published? Thanks :)

[JakeDawkins]

This should be released with apollo@2.21.1! Let me know if there are any issues! :)