@apollo/server/dist/esm/plugin/schemaIsSubgraph.js

Core engine for Apollo GraphQL server

import { isObjectType, isScalarType, isNonNullType, } from 'graphql';
export function schemaIsSubgraph(schema) {
    const serviceType = schema.getType('_Service');
    if (!isObjectType(serviceType)) {
        return false;
    }
    const sdlField = serviceType.getFields().sdl;
    if (!sdlField) {
        return false;
    }
    let sdlFieldType = sdlField.type;
    if (isNonNullType(sdlFieldType)) {
        sdlFieldType = sdlFieldType.ofType;
    }
    if (!isScalarType(sdlFieldType)) {
        return false;
    }
    return sdlFieldType.name == 'String';
}
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