graphql-mocks/graphql/utils/attach-type-resolvers-to-schema.js

Tools for setting up graphql test resolvers

'use strict';

var graphql = require('graphql');
function attachTypeResolversToSchema(schema, resolverMap) {
  for (const typeName in resolverMap) {
    const type = schema.getType(typeName);
    //  Note: __resolveType for type resolvers is a convention borrowed from
    //  graphql-tools resolver maps. This allows a single ResolverMap to be used
    // for both type resolvers for abstract types (unions & interfaces), as well
    // as field resolvers
    const typeResolver = resolverMap[typeName].__resolveType;
    const hasTypeResolver = Boolean(typeResolver);
    if (hasTypeResolver && graphql.isAbstractType(type)) {
      type.resolveType = typeResolver;
    }
  }
}
exports.attachTypeResolversToSchema = attachTypeResolversToSchema;
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