monorepo

packages/helpers/deferred.ts

@@ -0,0 +1,21 @@
+// eslint-disable-next-line import/no-unused-modules
+export type Deferred<T> = PromiseLike<T> & {
+  resolve: (value: T | PromiseLike<T>) => void
+  reject: (reason?: unknown) => void
+}
+
+export function createDeferred<T = void>(): Deferred<T> {
+  let resolve: (value: T | PromiseLike<T>) => void
+  let reject: (reason?: unknown) => void
+
+  const promise = new Promise<T>((_resolve, _reject) => {
+    resolve = _resolve
+    reject = _reject
+  })
+
+  return {
+    then: promise.then.bind(promise),
+    resolve: (value) => resolve(value),
+    reject: (reason) => reject(reason),
+  }
+}