Custom relay compiler which supports persisted queries
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README.md

relay-compiler-plus

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Custom relay compiler which supports persisted queries :bowtie:

Relay modern is awesome. However it's missing a few things, one of which is persisted queries. This package is a custom relay compiler which supports:

  • persisted queries
  • direct compilation of graphql-js

Direct graphql-js support means you can generate your relay queries, schema.graphql and query map files all in a single step!

Installation

yarn add relay-compiler-plus

Make sure you have the latest version of graphql-js:

yarn upgrade graphql --latest  

Usage

  1. Add this npm command to your package.json:

    "scripts": {
        "rcp": "NODE_ENV=production relay-compiler-plus --schema <SCHEMA_FILE_PATH> --src <SRC_DIR_PATH>"
    },
    

    where

    • <SCHEMA_FILE_PATH> is the path to your schema.graphql or schema.json file or schema.js (yes! rcp now supports direct compilation from graphql-js!).
    • <SRC_DIR_PATH> is the path to your src directory

    then:

    npm run rcp
    

    this should generate:

    • query files (*.graphql.js) containing query ids and null query text. Note that if you omit NODE_ENV=production, rcp will include both the query id and the query text in your query files. This can be useful for debugging in development.
    • A queryMap.json file under <SRC_DIR_PATH>/queryMap.json. This file can be consumed by the server to map the query ids to actual queries.
    • If you specified a schema.js file, this will also generate a schema.graphql file under ../<SRC_DIR_PATH>/schema.graphql. The schema.graphql has to sit outside the src folder otherwise the relay-compiler will complain.

    If your graphql-js file is complex and you need to override the default webpack config you can do so like this:

    "scripts": {
        "rcp": "NODE_ENV=production relay-compiler-plus --webpackConfig <WEBPACK_CONFIG_PATH> --src <SRC_DIR_PATH>"
    },
    

    where

    • <WEBPACK_CONFIG_PATH> is the path to your custom webpack config to transpile your graphql-js schema. In your custom webpack config, you need to set output.libraryTarget: 'commonjs2'. See the example config for a working copy.
  2. On the server, use matchQueryMiddleware prior to express-graphql to match queryIds to actual queries. Note that queryMap.json is auto-generated by relay-compiler-plus at step 1.

    import Express from 'express';
    import expressGraphl from 'express-graphql';
    import {matchQueryMiddleware} from 'relay-compiler-plus'; // do this
    import queryMapJson from '../queryMap.json'; // do this
    
    const app = Express();
    
    app.use('/graphql',
      matchQueryMiddleware(queryMapJson), // do this
      expressGraphl({
        schema: graphqlSchema,
        graphiql: true,
      }));
  3. On the client, modify your relay network fetch implementation to pass a queryId parameter in the request body instead of a query parameter. Note that operation.id is generated by relay-compiler-plus in step 1.

    function fetchQuery(operation, variables) {
      return fetch('/graphql', {
        method: 'POST',
        headers: {
          'content-type': 'application/json'
        },
        body: JSON.stringify({
          queryId: operation.id, // do this
          variables,
        }),
      }).then(response => {
        return response.json();
      });
    }

Run your app and that's it!

Example

Check the example for a fully working demo.