schemaQuery.js

const fetch     = require( 'node-fetch' );
const fs        = require( 'fs' );
const wooConfig = require( './wooConfig' );

fetch( `${ wooConfig.graphqlUrl }`, {
	method: 'POST',
	headers: { 'Content-Type': 'application/json' },
	body: JSON.stringify( {
		variables: {},
		query: `
      {
        __schema {
          types {
            kind
            name
            possibleTypes {
              name
            }
          }
        }
      }
    `,
	} ),
} )
	.then( result => result.json() )
	.then( result => {
		// here we're filtering out any type information unrelated to unions or interfaces
		const filteredData         = result.data.__schema.types.filter(
			type => type.possibleTypes !== null,
		);
		result.data.__schema.types = filteredData;
		fs.writeFile( './fragmentTypes.json', JSON.stringify( result.data ), err => {
			if ( err ) {
				console.error( 'Error writing fragmentTypes file', err );
			} else {
				console.log( 'Fragment types successfully extracted!' );
			}
		} );
	} );