graphql/getErrorType.js at master · Crawlo/graphql · GitHub

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import {
    GraphQLObjectType,
    GraphQLList,
    GraphQLScalarType,
    GraphQLEnumType,
    GraphQLUnionType,
    GraphQLString
} from './'
import getConfig from './getConfig'

/**
 * get an ErrorType from GraphQLObjectType
 * @param {(GraphQLObjectType|GraphQLList|GraphQLScalarType|GraphQLEnumType|GraphQLUnionType)} ObjectType Type to convert
 * @returns Error type
 */
export default function getErrorType(ObjectType, moreFields = {}, deep = false) {

    if(!deep && ObjectType._typeError)
        return ObjectType._typeError

    switch (ObjectType.constructor.name) {

        case 'GraphQLObjectType':

            let _fields = getConfig(ObjectType)

            if(deep && _fields.id && !ObjectType.entityLess)
                return GraphQLString

            return ObjectType._typeError || (ObjectType._typeError = new GraphQLObjectType({
                name: `${ObjectType.name}Error`,
                fields() {
                    let fields = {}
                    Object.keys(_fields).forEach(
                        key =>
                            fields[key] = {
                                type: getErrorType(_fields[key].type, moreFields[key] || {}, true)
                            }
                    )
                    return Object.assign(
                        fields,
                        moreFields
                    )
                }
            }))

        case 'GraphQLScalarType':
        case 'GraphQLEnumType':
        case 'GraphQLUnionType':

            return GraphQLString

        case 'GraphQLList':

            return new GraphQLList(
                getErrorType(ObjectType.ofType, moreFields, true)
            )

    }
}