relay-base.config.js

// relay.config.js
const fs = require("fs");
const path = require("path");

// function to merge schema.graphql and client-directives.graphql and write to merged_schema.graphql
const schemaFiles = [
  path.join(__dirname, "./data/schema.graphql"),
  path.join(__dirname, "./data/client-directives.graphql"),
];
const mergedSchema = schemaFiles
  .map((file) => fs.readFileSync(file, "utf8"))
  .join("\n");
fs.writeFileSync(
  path.join(__dirname, "./data/merged_schema.graphql"),
  mergedSchema,
);

module.exports = {
  // ...
  // Configuration options accepted by the `relay-compiler` command-line tool and `babel-plugin-relay`.
  language: "typescript", // "javascript" | "typescript" | "flow"
  schema: "data/merged_schema.graphql",
  // noFutureProofEnums: true,
  featureFlags: {
    // enable_relay_resolver_transform: true,
  },
  customScalarTypes: {
    // Be careful, the value of this setting is a typescript type. It is not a `String`.
    // https://www.typescriptlang.org/docs/handbook/declaration-files/do-s-and-don-ts.html#number-string-boolean-symbol-and-object
    DateTime: "string",
    UUID: "string",
    JSONString: "string",
  },
};