feat(ts-resolvers): Add ability to configure a custom resolver

packages/plugins/other/visitor-plugin-common/src/base-resolvers-visitor.ts

@@ -278,6 +278,7 @@ export interface RawResolversConfig extends RawConfig {
    *         inputValue: true
    *         object: true
    *         defaultValue: true
+   * 	       resolvers: true;
    * ```
    */
   avoidOptionals?: boolean | AvoidOptionalsConfig;
@@ -370,6 +371,22 @@ export interface RawResolversConfig extends RawConfig {
    * @ignore
    */
   directiveResolverMappings?: Record<string, string>;
+  /**
+   * @description Allow you to set the visitor class that will be used to traverse the graphql AST to generate
+   * the types.
+   *
+   *
+   * @exampleMarkdown
+   *
+   * ## Custom Visitor
+   *
+   * ```yaml
+   * plugins
+   *   config:
+   *     customVisitor: ./my-custom-visitor#VisitorClass
+   * ```
+   * **/
+  customVisitor?: string;
 }
 
 export type ResolverTypes = { [gqlType: string]: string };
@@ -431,6 +448,7 @@ export class BaseResolversVisitor<
       mappers: transformMappers(rawConfig.mappers || {}, rawConfig.mapperTypeSuffix),
       scalars: buildScalarsFromConfig(_schema, rawConfig, defaultScalars),
       internalResolversPrefix: getConfigValue(rawConfig.internalResolversPrefix, '__'),
+      customVisitor: getConfigValue(rawConfig.customVisitor, null), // If custom visitor is not set, we will use the default one
       ...additionalConfig,
     } as TPluginConfig);
 

packages/plugins/typescript/resolvers/src/index.ts

@@ -76,7 +76,18 @@ export type Resolver${capitalizedDirectiveName}WithResolve<TResult, TParent, TCo
   }
 
   const transformedSchema = config.federation ? addFederationReferencesToSchema(schema) : schema;
-  const visitor = new TypeScriptResolversVisitor({ ...config, directiveResolverMappings }, transformedSchema);
+
+  let visitor;
+
+  if (config.customVisitor) {
+    // @TODO: figure out how to use custom-visitor#VisirClass syntax
+    // instead of using default
+    const CustomVistor = require(config.customVisitor).default;
+    visitor = new CustomVistor({ ...config, directiveResolverMappings }, transformedSchema);
+  } else {
+    visitor = new TypeScriptResolversVisitor({ ...config, directiveResolverMappings }, transformedSchema);
+  }
+
   const namespacedImportPrefix = visitor.config.namespacedImportName ? `${visitor.config.namespacedImportName}.` : '';
 
   const astNode = getCachedDocumentNodeFromSchema(transformedSchema);