import { extractResolvers, loadFromModuleExportExpression } from '@graphql-mesh/utils'; import { composeResolvers } from '@graphql-tools/resolvers-composition'; import { addResolversToSchema } from '@graphql-tools/schema'; export default class ResolversCompositionTransform { constructor({ baseDir, config, importFn, }) { this.noWrap = config.mode ? config.mode !== 'wrap' : false; // use config.mode value or default to false this.compositions = Array.isArray(config) ? config : config.compositions; this.baseDir = baseDir; this.importFn = importFn; } transformSchema(schema) { const resolversComposition = {}; for (const { resolver, composer } of this.compositions) { const composerFn$ = loadFromModuleExportExpression(composer, { cwd: this.baseDir, defaultExportName: 'default', importFn: this.importFn, }); resolversComposition[resolver] = next => (...args) => composerFn$ .then(composerFn => (composerFn ? composerFn(next) : next)) .then(next => next(...args)); } const resolvers = extractResolvers(schema); const composedResolvers = composeResolvers(resolvers, resolversComposition); return addResolversToSchema({ schema, resolvers: composedResolvers, updateResolversInPlace: true, }); } }