@graphql-tools/federation/esm/utils.js

Useful tools to create and manipulate GraphQL schemas.

import { Kind } from 'graphql';
import { FilterRootFields, FilterTypes } from '@graphql-tools/wrap';
export function getArgsFromKeysForFederation(representations) {
    return { representations };
}
export function getKeyForFederation(root) {
    return root;
}
export function getCacheKeyFnFromKey(key) {
    const keyProps = key.split(' ');
    if (keyProps.length > 1) {
        return function cacheKeyFn(root) {
            return keyProps.map(key => root[key]).join(' ');
        };
    }
    return function cacheKeyFn(root) {
        return root[key];
    };
}
export function filterInternalFieldsAndTypes(finalSchema) {
    const removeEntitiesField = new FilterRootFields((operation, fieldName) => !(operation === 'Query' && (fieldName === '_entities' || fieldName === '_sdl')));
    const removeEntityAndAny = new FilterTypes(type => type.name !== '_Entity' &&
        type.name !== '_Any' &&
        type.name !== '_FieldSet' &&
        type.name !== '_Service' &&
        !type.name.startsWith('link__'));
    const fakeSubschemaConfig = {
        schema: finalSchema,
        transforms: [removeEntitiesField, removeEntityAndAny],
    };
    for (const transform of fakeSubschemaConfig.transforms) {
        finalSchema = transform.transformSchema(finalSchema, fakeSubschemaConfig);
    }
    return finalSchema;
}
export function getNamedTypeNode(typeNode) {
    if (typeNode.kind !== Kind.NAMED_TYPE) {
        return getNamedTypeNode(typeNode.type);
    }
    return typeNode;
}