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- import { getNamedType, isScalarType } from 'graphql';
- import { forEachField } from '@graphql-tools/utils';
- export function assertResolversPresent(schema, resolverValidationOptions = {}) {
- const { requireResolversForArgs, requireResolversForNonScalar, requireResolversForAllFields } = resolverValidationOptions;
- if (requireResolversForAllFields && (requireResolversForArgs || requireResolversForNonScalar)) {
- throw new TypeError('requireResolversForAllFields takes precedence over the more specific assertions. ' +
- 'Please configure either requireResolversForAllFields or requireResolversForArgs / ' +
- 'requireResolversForNonScalar, but not a combination of them.');
- }
- forEachField(schema, (field, typeName, fieldName) => {
- // requires a resolver for *every* field.
- if (requireResolversForAllFields) {
- expectResolver('requireResolversForAllFields', requireResolversForAllFields, field, typeName, fieldName);
- }
- // requires a resolver on every field that has arguments
- if (requireResolversForArgs && field.args.length > 0) {
- expectResolver('requireResolversForArgs', requireResolversForArgs, field, typeName, fieldName);
- }
- // requires a resolver on every field that returns a non-scalar type
- if (requireResolversForNonScalar !== 'ignore' && !isScalarType(getNamedType(field.type))) {
- expectResolver('requireResolversForNonScalar', requireResolversForNonScalar, field, typeName, fieldName);
- }
- });
- }
- function expectResolver(validator, behavior, field, typeName, fieldName) {
- if (!field.resolve) {
- const message = `Resolver missing for "${typeName}.${fieldName}".
- To disable this validator, use:
- resolverValidationOptions: {
- ${validator}: 'ignore'
- }`;
- if (behavior === 'error') {
- throw new Error(message);
- }
- if (behavior === 'warn') {
- console.warn(message);
- }
- return;
- }
- if (typeof field.resolve !== 'function') {
- throw new Error(`Resolver "${typeName}.${fieldName}" must be a function`);
- }
- }
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