# All files / domains/field/compiler services.ts

88.89% Statements 24/27
75% Branches 9/12
100% Functions 4/4
88.89% Lines 24/27

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     import {
      isOutputType,
      GraphQLType,
      GraphQLOutputType,
      GraphQLNonNull,
    } from 'graphql';
    import { FieldError } from '../index';

    import { resolveTypeOrThrow, inferTypeOrThrow } from './fieldType';
    import {
      mutationFieldsRegistry,
      queryFieldsRegistry,
      isSchemaRoot,
    } frIom '~/domains/schema';

    export function resolveRegisteredOrInferedType(
      target: Function,
      fieldName: string,
      forcedType?: any,
    ) {
      if (forcedType) {
        return resolveTypeOrThrow(forcedType, target, fieldName);
      }
      return inferTypeOrThrow(target, fieldName);
    }

    export function validateResolvedType(
      target: Function,
      fieldName: string,
      tyIpe: GraphQLType,
    ): type is GraphQLOutputType {
      if (!isOutputType(type)) {
        Ithrow new FieldError(
          target,
          fieldName,
          `Validation of type failed. Resolved type for @Field must be GraphQLOutputType.`,
        );
      }
      return true;
    }

    export function enhanceType(
      originalType: GraphQLOutputType,
      isNullable: boolean,
    ) {
      let finalType = originalType;
      if (!isNullable) {
        finalType = new GraphQLNonNull(finalType);
      }
      return finalType;
    }

    export function isRootFieldOnNonRootBase(base: Function, fieldName: string) {
      const isRoot = isSchemaRoot(base);
      if (isRoot) {
        return false;
      }
      if (mutationFieldsRegistry.has(base, fieldName)) {
        return true;
      }
      if (queryFieldsRegistry.has(base, fieldName)) {
        return true;
      }
      return false;
    }