fix: stack size exceed error on purging module cache

src/utils/index.ts

@@ -0,0 +1,51 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at https://mozilla.org/MPL/2.0/.
+ */
+
+import { promises as fs } from "fs";
+import * as path from "path";
+
+export { decacheModule } from "./decache-module";
+
+/**
+ * Recursively walk a directory, returning the files it finds.
+ *
+ * @param dirPath Path to the directory to walk.
+ *
+ * @return Generator that yields the files found while walking the directory.
+ */
+export const walkDir = async function* (
+    dirPath: string
+): AsyncGenerator<string> {
+    const dirEnts = await fs.readdir(dirPath, { withFileTypes: true });
+    for (const dirEnt of dirEnts) {
+        if (dirEnt.isDirectory()) {
+            yield* walkDir(path.join(dirPath, dirEnt.name));
+        }
+        if (dirEnt.isFile()) {
+            yield path.join(dirPath, dirEnt.name);
+        }
+    }
+};
+
+export type Flattenable<T> = Array<T | Flattenable<T>>;
+
+/**
+ * Flatten an arbitrarily-deeply nested array into a flat array.
+ *
+ * @param arr Array to flatten.
+ *
+ * @return Flattened array.
+ */
+export const flatDeep = <T>(arr: Flattenable<T>): T[] => {
+    const flattenedArr: T[] = [];
+    for (const val of arr) {
+        if (Array.isArray(val)) {
+            flattenedArr.push(...flatDeep(val));
+        } else {
+            flattenedArr.push(val);
+        }
+    }
+    return flattenedArr;
+};