fix(fs): Fix directory handling in copy and copySync functions

ts/fs.ts

@@ -75,6 +75,9 @@ export const isFile = (pathArg): boolean => {
  * copies a file or directory from A to B on the local disk
  */
 export const copy = async (fromArg: string, toArg: string): Promise<void> => {
+  if (isDirectory(fromArg) && isDirectory(toArg)) {
+    await remove(toArg);
+  }
   return await plugins.fsExtra.copy(fromArg, toArg, {overwrite: true});
 };
 
@@ -82,6 +85,9 @@ export const copy = async (fromArg: string, toArg: string): Promise<void> => {
  * copies a file or directory SYNCHRONOUSLY from A to B on the local disk
  */
 export const copySync = (fromArg: string, toArg: string): void => {
+  if (isDirectory(fromArg) && isDirectory(toArg)) {
+    removeSync(toArg);
+  }
   return plugins.fsExtra.copySync(fromArg, toArg, {overwrite: true});
 };