gql-generator

Generate queries from graphql schema, used for writing api test.

Example

# Sample schema
type Query {
  user(id: Int!): User!
}

type User {
  id: Int!
  username: String!
  email: String!
  createdAt: String!
}

# Sample query generated
query user($id: Int!) {
  user(id: $id){
    id
    username
    email
    createdAt
  }
}

Usage

• Install:

  npm install https://github.com/vulcanize/gql-generator.git -g

• See the usage options:

  gqlg --help

• CLI:

  gqlg --schemaFilePath <schemaFilePath> --destDirPath <destDirPath> --depthLimit [depthLimit] --includeDeprecatedFields [includeDeprecatedFields]

  • schemaFilePath: Path of your graphql schema file.
  • destDirPath: Dir you want to store the generated queries.
  • depthLimit: Query depth you want to limit (default: 100).
  • excludeNestedArgs: Flag to exclude nested arguments (default: false).
  • includeDeprecatedFields: Flag to include deprecated fields (default: false).

  Example:

  gqlg --schemaFilePath ./example/sampleTypeDef.graphql --destDirPath ./example/output --depthLimit 5

  Now the queries generated from the sampleTypeDef.graphql can be found in the destDir: ./example/output.

• As a package:

  Example:

  const fs = require('fs');
  const path = require('path');
  const { gqlGenerate } = require('gql-generator');
  
  const schemaContent = fs.readFileSync(path.resolve('./example/sampleTypeDef.graphql'), 'utf-8');
  const gqlDir = './example/output';
  gqlGenerate(schemaContent, gqlDir);

• This tool generate 3 folders holding the queries: mutations, queries and subscriptions. And also index.ts files to export the queries in each folder.

• You can require the queries like this:

  // require all the queries
  const queries = require('./example/output');
  // require mutations only
  const mutations = require('./example/output/mutations');
  
  // sample content
  console.log(queries.mutations.signup);
  console.log(mutations.signup);
  /*
  mutation signup($username: String!, email: String!, password: String!){
    signup(username: $username, email: $email, password: $password){
      token
      user {
        id
        username
        email
        createdAt
      }
    }
  }
  */

• The tool will automatically exclude any @deprecated schema fields (see more on schema directives here). To change this behavior to include deprecated fields you can use the includeDeprecatedFields flag when running the tool, e.g. gqlg --includeDeprecatedFields.

Usage example

Say you have a graphql schema like this:

type Mutation {
  signup(
    email: String!
    username: String!
    password: String!
  ): UserToken!
}

type UserToken {
  token: String!
  user: User!
}

type User {
  id: Int!
  username: String!
  email: String!
  createdAt: String!
}

Before this tool, you write graphql api test like this:

const { GraphQLClient } = require('graphql-request');
require('should');

const host = 'http://localhost:8080/graphql';

test('signup', async () => {
  const gql = new GraphQLClient(host);
  const query = `mutation signup($username: String!, email: String!, password: String!){
    signup(username: $username, email: $email, password: $password){
      token
      user {
        id
        username
        email
        createdAt
      }
    }
  }`;

  const data = await gql.request(query, {
    username: 'tim',
    email: '[email protected]',
    password: 'samplepass',
  });

  (typeof data.signup.token).should.equal('string');
);

As gqlg generated the queries for you, you don't need to write the query yourself, so your test will becomes:

const { GraphQLClient } = require('graphql-request');
require('should');
const mutations = require('./example/output/mutations');

const host = 'http://localhost:8080/graphql';

test('signup', async () => {
  const gql = new GraphQLClient(host);

  const data = await gql.request(mutations.signup, {
    username: 'tim',
    email: '[email protected]',
    password: 'samplepass',
  });

  (typeof data.signup.token).should.equal('string');
);

Notes

• As this tool is used for tests, it expands all of the fields in a query. There might be recursive fields in the query, so gqlg ignores the types which have been added in the parent queries already.
• Variable names are derived from argument names, so variables generated from multiple occurrences of the same argument name must be deduped. An index is appended to any duplicates e.g. region(language: $language1).

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