fix: Do not show directory read errors

Author: hyperupcall

src/adapters/fileSystem.ts

@@ -1,5 +1,5 @@
 export type FileSystem = {
     fileExists: (filePath: string) => Promise<boolean>;
-    readFile: (filePath: string) => Promise<Error | string>;
-    writeFile: (filePath: string, contents: string) => Promise<Error | undefined>;
+    readFile: (filePath: string) => Promise<NodeJS.ErrnoException | string>;
+    writeFile: (filePath: string, contents: string) => Promise<NodeJS.ErrnoException | undefined>;
 };

src/converters/comments/convertFileComments.ts

@@ -16,7 +16,11 @@ export const convertFileComments = async (
 ) => {
     const fileContent = await dependencies.fileSystem.readFile(filePath);
     if (fileContent instanceof Error) {
-        return fileContent;
+        if (fileContent.code === "EISDIR") {
+            return undefined;
+        } else {
+            return fileContent;
+        }
     }
 
     const comments = parseFileComments(filePath, fileContent);