removing .flat function to get rid of its dependency (#1105)

Author: rishabhmalikMS

node/task.ts

@@ -1047,7 +1047,7 @@ export function ls(optionsOrPaths?: unknown, ...paths: unknown[]): string[] {
 
     // Flatten paths if the paths argument is array
     if (Array.isArray(paths)) {
-        paths = paths.flat(Infinity);
+        paths = flattenArray(paths);
     }
 
     // If the first argument is not options, then it is a path
@@ -1121,6 +1121,12 @@ export function ls(optionsOrPaths?: unknown, ...paths: unknown[]): string[] {
     }
 }
 
+function flattenArray(arr: any[]): any[] {
+    return arr.reduce((flat, toFlatten) => {
+        return flat.concat(Array.isArray(toFlatten) ? flattenArray(toFlatten) : toFlatten);
+    }, []);
+}
+
 type CopyOptionsVariants = OptionsPermutations<'frn'>;
 
 /**