Switching from graphql-js to native graphql schemas? - graphql

Question

Currently trying to switch from graphql-js to literal GraphQL types/schemas, I'd like to know if anyone has had any experience with this.
Let's take this really simple one :
const Person = new GraphQLObjectType({
name: 'Person',
fields: () => ({
name: {
type: GraphQLString,
description: 'Person name',
},
}),
});
I'd like to switch to the native GraphQL schema syntax i.e
type Person {
# Person name
name: String
}
However this would have to be incremental, and given the use of graphql-js, the best solution for now would be to parse GraphQL template literals to GraphQLObjectType (or any other type for that matter). Does anyone have experience doing this, I cannot seem to find any library for it unfortunately.

Answer 1

import { printType } from 'graphql';
printType(Person)
output:
type Person {
"""Person name"""
name: String
}
Here is the demo:
import { expect } from 'chai';
import { printType, printSchema, buildSchema, GraphQLSchema } from 'graphql';
import { logger } from '../util';
import { Person } from './';
describe('test suites', () => {
it('convert constructor types to string types', () => {
const stringTypeDefs = printType(Person).replace(/\s/g, '');
logger.info(printType(Person));
const expectValue = `
type Person {
"""Person name"""
name: String
}
`.replace(/\s/g, '');
expect(stringTypeDefs).to.be.equal(expectValue);
});
it('buildSchema', () => {
const stringTypeDefs = printType(Person);
const schema = buildSchema(stringTypeDefs);
expect(schema).to.be.an.instanceof(GraphQLSchema);
});
it('printSchema', () => {
const stringTypeDefs = printType(Person);
const schema = printSchema(buildSchema(stringTypeDefs));
logger.info(schema);
const expectValue = `
type Person {
"""Person name"""
name: String
}
`.replace(/\s/g, '');
expect(schema.replace(/\s/g, '')).to.be.eql(expectValue);
});
});
source code:
https://github.com/mrdulin/nodejs-graphql/blob/master/src/convert-constructor-types-to-string-types/index.spec.ts

Answer 2

You can use graphql-cli to extract a native graphql schema from a graphql server. All you need to do is..
Download the tool | npm i -g graphql-cli
Run graphql init in the directory of your project to
create .graphqlconfig file
Start your graphql server
Run graphql get-schema and this will generate a your schema in native graphql
SAMPLE .graphqlconfig
{
"projects": {
"my_sample_project": {
"schemaPath": "schema.graphql",
"extensions": {
"endpoints": {
"local": "http://localhost:8080/graphql"
}
}
}
}
}
We leverage the auto-generation of graphql schema/queries/mutations for our CI workflows.