Filter empty files to prevent GraphQL codegen plugin configuration errors (#393)

* fix(preset): use correct plugin reference in pluginMap and skip empty files

* Add chanageset

* Set up test for empty file case

* Format

---------

Co-authored-by: Eddy Nguyen <[email protected]>
Co-authored-by: Eddy Nguyen <[email protected]>

Author: sammwafy

.changeset/every-sites-cheat.md

@@ -0,0 +1,5 @@
+---
+'@eddeee888/gcg-operation-location-migration': patch
+---
+
+Fix empty file breaking codemod

packages/operation-location-migration-e2e/src/test-apollo-support/components/Empty.ts

@@ -351,16 +351,19 @@ export const preset: Types.OutputPreset<TypedPresetConfig> = {
       );
     });
 
-    return tsProject.getSourceFiles().map((tsSourceFile) => {
-      return {
-        filename: tsSourceFile.getFilePath(),
-        pluginMap: { add: addPlugin },
-        plugins: [{ add: { content: tsSourceFile.getFullText() } }],
-        config: {},
-        schema,
-        documents: [],
-      };
-    });
+    return tsProject
+      .getSourceFiles()
+      .filter((sf) => sf.getFullText().trim().length > 0)
+      .map((tsSourceFile) => {
+        return {
+          filename: tsSourceFile.getFilePath(),
+          pluginMap: { add: addPlugin },
+          plugins: [{ add: { content: tsSourceFile.getFullText() } }],
+          config: {},
+          schema,
+          documents: [],
+        };
+      });
   },
 };