add useTypeImports config

Author: Toanzzz

src/config.ts

@@ -52,6 +52,28 @@ export interface ValidationSchemaPluginConfig extends TypeScriptPluginConfig {
    * ```
    */
   importFrom?: string;
+  /**
+   * @description Will use `import type {}` rather than `import {}` when importing generated typescript types.
+   * This gives compatibility with TypeScript's "importsNotUsedAsValues": "error" option
+   * Should used in conjunction with `importFrom` option.
+   *
+   * @exampleMarkdown
+   * ```yml
+   * generates:
+   *   path/to/types.ts:
+   *     plugins:
+   *       - typescript
+   *   path/to/schemas.ts:
+   *     plugins:
+   *       - graphql-codegen-validation-schema
+   *     config:
+   *       schema: yup
+   *       importFrom: ./path/to/types
+   *       useTypeImports: true
+   * 
+   * ```
+   */
+  useTypeImports?: boolean;
   /**
    * @description Prefixes all import types from generated typescript type.
    * @default ""

src/myzod/index.ts

@@ -25,7 +25,10 @@ export const MyZodSchemaVisitor = (schema: GraphQLSchema, config: ValidationSche
   return {
     buildImports: (): string[] => {
       if (config.importFrom && importTypes.length > 0) {
-        return [importZod, `import { ${importTypes.join(', ')} } from '${config.importFrom}'`];
+        return [
+          importZod,
+          `import ${config.useTypeImports ? 'type ' : ''}{ ${importTypes.join(', ')} } from '${config.importFrom}'`,
+        ];
       }
       return [importZod];
     },