Ignore codegen formatting and add eslint-ignore to generated files

.prettierignore

@@ -0,0 +1 @@
+codegen/snippet-tests/output/*

codegen/snippet-tests/output/01_primitive_types.pkl.ts

@@ -1,5 +1,7 @@
-// This file was generated by `pkl-typescript` from Pkl module `01-primitiveTypes`.
-// DO NOT EDIT.
+/* This file was generated by `pkl-typescript` from Pkl module `01-primitiveTypes`. */
+/* DO NOT EDIT! */
+/* istanbul ignore file */
+/* eslint-disable */
 import * as pklTypescript from "@pkl-community/pkl-typescript"
 
 // Ref: Module root.

codegen/snippet-tests/output/02_collections.pkl.ts

@@ -1,5 +1,7 @@
-// This file was generated by `pkl-typescript` from Pkl module `02-collections`.
-// DO NOT EDIT.
+/* This file was generated by `pkl-typescript` from Pkl module `02-collections`. */
+/* DO NOT EDIT! */
+/* istanbul ignore file */
+/* eslint-disable */
 import * as pklTypescript from "@pkl-community/pkl-typescript"
 
 // Ref: Module root.

codegen/snippet-tests/output/03_nullables.pkl.ts

@@ -1,5 +1,7 @@
-// This file was generated by `pkl-typescript` from Pkl module `03-nullables`.
-// DO NOT EDIT.
+/* This file was generated by `pkl-typescript` from Pkl module `03-nullables`. */
+/* DO NOT EDIT! */
+/* istanbul ignore file */
+/* eslint-disable */
 import * as pklTypescript from "@pkl-community/pkl-typescript"
 
 // Ref: Module root.

codegen/snippet-tests/output/04_with_class.pkl.ts

@@ -1,5 +1,7 @@
-// This file was generated by `pkl-typescript` from Pkl module `04-withClass`.
-// DO NOT EDIT.
+/* This file was generated by `pkl-typescript` from Pkl module `04-withClass`. */
+/* DO NOT EDIT! */
+/* istanbul ignore file */
+/* eslint-disable */
 import * as pklTypescript from "@pkl-community/pkl-typescript"
 
 // Ref: Module root.

codegen/snippet-tests/output/05_with_pair.pkl.ts

@@ -1,5 +1,7 @@
-// This file was generated by `pkl-typescript` from Pkl module `05-withPair`.
-// DO NOT EDIT.
+/* This file was generated by `pkl-typescript` from Pkl module `05-withPair`. */
+/* DO NOT EDIT! */
+/* istanbul ignore file */
+/* eslint-disable */
 import * as pklTypescript from "@pkl-community/pkl-typescript"
 
 // Ref: Module root.

codegen/snippet-tests/output/06_with_type_alias.pkl.ts

@@ -1,5 +1,7 @@
-// This file was generated by `pkl-typescript` from Pkl module `06-withTypeAlias`.
-// DO NOT EDIT.
+/* This file was generated by `pkl-typescript` from Pkl module `06-withTypeAlias`. */
+/* DO NOT EDIT! */
+/* istanbul ignore file */
+/* eslint-disable */
 import * as pklTypescript from "@pkl-community/pkl-typescript"
 
 // Ref: Module root.

codegen/snippet-tests/output/07_literal_types.pkl.ts

@@ -1,5 +1,7 @@
-// This file was generated by `pkl-typescript` from Pkl module `07-literalTypes`.
-// DO NOT EDIT.
+/* This file was generated by `pkl-typescript` from Pkl module `07-literalTypes`. */
+/* DO NOT EDIT! */
+/* istanbul ignore file */
+/* eslint-disable */
 import * as pklTypescript from "@pkl-community/pkl-typescript"
 
 // Ref: Module root.

codegen/snippet-tests/output/08_with_union.pkl.ts

@@ -1,5 +1,7 @@
-// This file was generated by `pkl-typescript` from Pkl module `08-withUnion`.
-// DO NOT EDIT.
+/* This file was generated by `pkl-typescript` from Pkl module `08-withUnion`. */
+/* DO NOT EDIT! */
+/* istanbul ignore file */
+/* eslint-disable */
 import * as pklTypescript from "@pkl-community/pkl-typescript"
 
 // Ref: Module root.

codegen/snippet-tests/output/09_custom_types.pkl.ts

@@ -1,5 +1,7 @@
-// This file was generated by `pkl-typescript` from Pkl module `09-customTypes`.
-// DO NOT EDIT.
+/* This file was generated by `pkl-typescript` from Pkl module `09-customTypes`. */
+/* DO NOT EDIT! */
+/* istanbul ignore file */
+/* eslint-disable */
 import * as pklTypescript from "@pkl-community/pkl-typescript"
 
 // Ref: Module root.

codegen/snippet-tests/output/11_with_import.pkl.ts

@@ -1,5 +1,7 @@
-// This file was generated by `pkl-typescript` from Pkl module `11-withImport`.
-// DO NOT EDIT.
+/* This file was generated by `pkl-typescript` from Pkl module `11-withImport`. */
+/* DO NOT EDIT! */
+/* istanbul ignore file */
+/* eslint-disable */
 import * as pklTypescript from "@pkl-community/pkl-typescript"
 
 // Ref: Module root.

codegen/snippet-tests/output/n10_pkl_typescript_tests_named_module.pkl.ts

@@ -1,5 +1,7 @@
-// This file was generated by `pkl-typescript` from Pkl module `n10.pkl.typescript.tests.namedModule`.
-// DO NOT EDIT.
+/* This file was generated by `pkl-typescript` from Pkl module `n10.pkl.typescript.tests.namedModule`. */
+/* DO NOT EDIT! */
+/* istanbul ignore file */
+/* eslint-disable */
 import * as pklTypescript from "@pkl-community/pkl-typescript"
 
 // Ref: Module root.

codegen/snippet-tests/output/n12_pkl_typescript_tests_module_name_override.pkl.ts

@@ -1,5 +1,7 @@
-// This file was generated by `pkl-typescript` from Pkl module `n12.pkl.typescript.tests.moduleNameOverride`.
-// DO NOT EDIT.
+/* This file was generated by `pkl-typescript` from Pkl module `n12.pkl.typescript.tests.moduleNameOverride`. */
+/* DO NOT EDIT! */
+/* istanbul ignore file */
+/* eslint-disable */
 import * as pklTypescript from "@pkl-community/pkl-typescript"
 
 // Ref: Module root.

codegen/src/internal/TypescriptModule.pkl

@@ -69,8 +69,10 @@ local imports = generated
 
 contents: String = new Listing {
   """
-  // This file was generated by `pkl-typescript` from Pkl module `\(`module`.moduleClass.enclosingDeclaration.name)`.
-  // DO NOT EDIT.
+  /* This file was generated by `pkl-typescript` from Pkl module `\(`module`.moduleClass.enclosingDeclaration.name)`. */
+  /* DO NOT EDIT! */
+  /* istanbul ignore file */
+  /* eslint-disable */
   """
 
   utils.renderImports(imports)