graphql-config.ts

import { ApolloEngineLoader } from '@graphql-tools/apollo-engine-loader';
import { CodeFileLoader } from '@graphql-tools/code-file-loader';
import { GitLoader } from '@graphql-tools/git-loader';
import { GithubLoader } from '@graphql-tools/github-loader';
import { PrismaLoader } from '@graphql-tools/prisma-loader';
import { GraphQLConfig, GraphQLExtensionDeclaration, loadConfig } from 'graphql-config';

export const CodegenExtension: GraphQLExtensionDeclaration = (api: any) => {
  // Schema
  api.loaders.schema.register(
    new CodeFileLoader({
      pluckConfig: {
        skipIndent: true,
      },
    })
  );
  api.loaders.schema.register(new GitLoader());
  api.loaders.schema.register(new GithubLoader());
  api.loaders.schema.register(new ApolloEngineLoader());
  api.loaders.schema.register(new PrismaLoader());
  // Documents
  api.loaders.documents.register(
    new CodeFileLoader({
      pluckConfig: {
        skipIndent: true,
      },
    })
  );
  api.loaders.documents.register(new GitLoader());
  api.loaders.documents.register(new GithubLoader());

  return {
    name: 'codegen',
  };
};

export async function findAndLoadGraphQLConfig(filepath?: string): Promise<GraphQLConfig | void> {
  const config = await loadConfig({
    filepath,
    rootDir: process.cwd(),
    extensions: [CodegenExtension],
    throwOnEmpty: false,
    throwOnMissing: false,
  });

  if (isGraphQLConfig(config)) {
    return config;
  }
}

// Kamil: user might load a config that is not GraphQL Config
//        so we need to check if it's a regular config or not
function isGraphQLConfig(config: GraphQLConfig): config is GraphQLConfig {
  if (!config) {
    return false;
  }

  try {
    for (const projectName in config.projects) {
      if (Object.prototype.hasOwnProperty.call(config.projects, projectName)) {
        const project = config.projects[projectName];

        if (project.hasExtension('codegen')) {
          return true;
        }
      }
    }
  } catch {}

  try {
    return config.getDefault().hasExtension('codegen');
  } catch {}

  return false;
}