1 files changed, 35 insertions, 0 deletions
diff --git a/std/node/_utils.ts b/std/node/_utils.ts
new file mode 100644
index 000000000..f0808e82b
--- /dev/null
+++ b/std/node/_utils.ts
@@ -0,0 +1,35 @@
+export function notImplemented(msg?: string): never {
+  const message = msg ? `Not implemented: ${msg}` : "Not implemented";
+  throw new Error(message);
+}
+
+// API helpers
+
+export type MaybeNull<T> = T | null;
+export type MaybeDefined<T> = T | undefined;
+export type MaybeEmpty<T> = T | null | undefined;
+
+export function intoCallbackAPI<T>(
+  /* eslint-disable-next-line @typescript-eslint/no-explicit-any */
+  func: (...args: any[]) => Promise<T>,
+  cb: MaybeEmpty<(err: MaybeNull<Error>, value: MaybeEmpty<T>) => void>,
+  /* eslint-disable-next-line @typescript-eslint/no-explicit-any */
+  ...args: any[]
+): void {
+  func(...args)
+    .then(value => cb && cb(null, value))
+    .catch(err => cb && cb(err, null));
+}
+
+export function intoCallbackAPIWithIntercept<T1, T2>(
+  /* eslint-disable-next-line @typescript-eslint/no-explicit-any */
+  func: (...args: any[]) => Promise<T1>,
+  interceptor: (v: T1) => T2,
+  cb: MaybeEmpty<(err: MaybeNull<Error>, value: MaybeEmpty<T2>) => void>,
+  /* eslint-disable-next-line @typescript-eslint/no-explicit-any */
+  ...args: any[]
+): void {
+  func(...args)
+    .then(value => cb && cb(null, interceptor(value)))
+    .catch(err => cb && cb(err, null));
+}