Leverage GraphQL Documents in Apollo Client querying for optimized performance

In my Typescript application, I have developed a Rest API using NestJS and interacting with a GraphQL server via Apollo Client.

Currently, my queries are hardcoded in the following manner:

const query = "query { example }";

this.apolloClient.query({
  query: gql`
    ${query}
  `,
});

I would like to store these queries in separate .graphql files and use them as DocumentNode.

example.graphql

query {
  example
}
import example from "example.graphql";

this.apolloClient.query({
  query: example,
});

I need assistance on how to achieve this.

I attempted creating a graphql.d.ts file with the following code:

declare module "*.graphql" {
  import { DocumentNode } from "graphql";
  const value: DocumentNode;
  export default value;
}

However, I keep encountering the error

Cannot find module "example.graphql" or its corresponding type declarations
.

import example from "example.graphql";
                    ~~~~~~~~~~~~~~~~~

Answer №1

Avoid importing files with the extension .grapql, instead, import the automatically generated hooks that are dependent on those .grapql files.

I will provide some tips, but you need to tailor them to your specific situation.

1) Setting up GraphQL and Necessary Packages

npm install @nestjs/graphql graphql-tools graphql apollo-server-express @graphql-codegen/cli @graphql-codegen/typescript @graphql-codegen/typescript-resolvers 

2) Configuring GraphQL Module in NestJS

import { Module } from '@nestjs/common';
import { GraphQLModule } from '@nestjs/graphql';
import { ApolloDriver, ApolloDriverConfig } from '@nestjs/apollo';
import { join } from 'path';

@Module({
  imports: [
    GraphQLModule.forRoot<ApolloDriverConfig>({
      driver: ApolloDriver,
      autoSchemaFile: join(process.cwd(), 'src/schema.gql'), // auto-generate schema file
    }),
  ],
})
export class AppModule {}

3) Defining GraphQL Schemas (SDL)

Example src/schema.graphql <-- !Here¡

type Query {
  hello: String!
}

4) Configuring Code Generation Settings

codegen.yml

overwrite: true
schema: "src/schema.graphql"
generates:
  src/graphql.ts:
    plugins:
      - "typescript"
      - "typescript-resolvers"

5) Running Code Generation for Type Generation

package.json

{
  "scripts": {
    "generate": "graphql-codegen"
  }
}

npm run generate

In the codegen.yml, you specify the output file, which in this case is src/graphql.ts
After the generation process is complete, you can import the auto-generated hooks. If you make modifications to your .graphl files, remember to run: npm run generate again
Hopefully, these instructions will be helpful ().

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