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Update docs on how to pass schema for newer BuckleScript releases. #88

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Update docs on how to pass schema for newer BuckleScript releases. #88

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12 changes: 10 additions & 2 deletions README.md
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Expand Up @@ -83,12 +83,20 @@ npm run send-introspection-query http://my-api.example.com/api

If you've already got a schema file downloaded for other purposes, you can tell
graphql_ppx to use that one by updating the "ppx-flags" in `bsconfig.json`.
Note: no space around the equal sign!
The syntax for passing arguments to a ppx is dependent on the version of
BuckleScript you are using and, consequently, is only available in BuckleScript 5.1.0+.
On older versions of BuckleScript there is no way to pass the ppx argument, so
you will have to symlink your schema file to `graphql_schema.json`, relying on
graphql_ppx's default filename loading to read your custom schema file.

Note: no space around the equal sign! Note also that the ppx and arguments are
supplied as a nested array. If you supply them simply as strings, BuckleScript
will treat each argument as its own ppx.

```json
{
"ppx-flags": [
"graphql_ppx/ppx\\ -schema=your_schema.json"
["graphql_ppx/ppx", "-schema=your_schema.json"]
]
}
```
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