added typesPrefix config

README.md

@@ -80,6 +80,33 @@ import { GeneratedInput } from './graphql'
 /* generates validation schema here */
 ```
 
+### `typesPrefix`
+
+type: `string` default: (empty)
+
+Prefixes all import types from generated typescript type.
+
+```yml
+generates:
+  path/to/graphql.ts:
+    plugins:
+      - typescript
+  path/to/validation.ts:
+    plugins:
+      - typescript-validation-schema
+    config:
+      typesPrefix: I
+      importFrom: ./graphql # path for generated ts code
+```
+
+Then the generator generates code with import statement like below.
+
+```ts
+import { IGeneratedInput } from './graphql'
+
+/* generates validation schema here */
+```
+
 ### `enumsAsTypes`
 
 type: `boolean` default: `false`

src/config.ts

@@ -52,6 +52,25 @@ export interface ValidationSchemaPluginConfig extends TypeScriptPluginConfig {
    * ```
    */
   importFrom?: string;
+  /**
+   * @description Prefixes all import types from generated typescript type.
+   * @default ""
+   *
+   * @exampleMarkdown
+   * ```yml
+   * generates:
+   *   path/to/types.ts:
+   *     plugins:
+   *       - typescript
+   *   path/to/schemas.ts:
+   *     plugins:
+   *       - graphql-codegen-validation-schema
+   *     config:
+   *       typesPrefix: I
+   *       importFrom: ./path/to/types
+   * ```
+   */
+  typesPrefix?: string;
   /**
    * @description Generates validation schema for enum as TypeScript `type`
    * @default false

tests/myzod.spec.ts

@@ -280,6 +280,25 @@ describe('myzod', () => {
       expect(result.content).toContain(wantContain);
     }
   });
+  it('with typesPrefix', async () => {
+    const schema = buildSchema(/* GraphQL */ `
+      input Say {
+        phrase: String!
+      }
+    `);
+    const result = await plugin(
+      schema,
+      [],
+      {
+        schema: 'myzod',
+        typesPrefix: 'I',
+        importFrom: './types',
+      },
+      {}
+    );
+    expect(result.prepend).toContain("import { ISay } from './types'");
+    expect(result.content).toContain('export function ISaySchema(): myzod.Type<ISay> {');
+  });
   describe('issues #19', () => {
     it('string field', async () => {
       const schema = buildSchema(/* GraphQL */ `

tests/yup.spec.ts

@@ -275,4 +275,23 @@ describe('yup', () => {
       expect(result.content).toContain(wantContain);
     }
   });
+
+  it('with typesPrefix', async () => {
+    const schema = buildSchema(/* GraphQL */ `
+      input Say {
+        phrase: String!
+      }
+    `);
+    const result = await plugin(
+      schema,
+      [],
+      {
+        typesPrefix: 'I',
+        importFrom: './types',
+      },
+      {}
+    );
+    expect(result.prepend).toContain("import { ISay } from './types'");
+    expect(result.content).toContain('export function ISaySchema(): yup.SchemaOf<ISay> {');
+  });
 });

tests/zod.spec.ts

@@ -280,6 +280,26 @@ describe('zod', () => {
       expect(result.content).toContain(wantContain);
     }
   });
+
+  it('with typesPrefix', async () => {
+    const schema = buildSchema(/* GraphQL */ `
+      input Say {
+        phrase: String!
+      }
+    `);
+    const result = await plugin(
+      schema,
+      [],
+      {
+        schema: 'zod',
+        typesPrefix: 'I',
+        importFrom: './types',
+      },
+      {}
+    );
+    expect(result.prepend).toContain("import { ISay } from './types'");
+    expect(result.content).toContain('export function ISaySchema(): z.ZodObject<Properties<ISay>> {');
+  });
   describe('issues #19', () => {
     it('string field', async () => {
       const schema = buildSchema(/* GraphQL */ `