Add operation export name

[aspirisen]

This PR is relative to this issue #3949

It allows you to add operation name to output file.

[dotansimha]

Thanks @aspirisen !

This should work only with .d.ts output, right? it won't work with .ts extension? because some configuration flags might effect that as well.

Also, have you checked graphql-let (https://github.com/piglovesyou/graphql-let#readme) package? it should does that automatically as far as I know.

[aspirisen]

@dotansimha Yes, it would work only in d.tsfiles, but it is up to user because there is a flag for that. But if user uses only types this flag will help him to import everything from one file.

I checked graphql-let and there is one issue that stops me using it piglovesyou/graphql-let#60

[dotansimha]

If you need to have a more strict path in the module declaration, you can use this configuration: https://github.com/dotansimha/graphql-code-generator/blob/master/packages/plugins/typescript/graphql-files-modules/src/index.ts#L6-L25 (it's not in the docs, we need to update it).

I afraid that the name you set for this variable might conflict with other plugins, we need to check that.

[aspirisen]

@dotansimha what variable do you mean, the const export in d.ts?

[dotansimha]

I think we can get this one merged. Thank you @aspirisen , sorry it took so long!

[theguild-bot]

The latest changes of this PR are available as alpha in npm: 1.17.8-alpha-36cbf188.0

Quickly update your package.json by running:

npx match-version @graphql-codegen 1.17.8-alpha-36cbf188.0