From 7ddef45ec4c76b7fc710e2c44d2087dfc2e7fa16 Mon Sep 17 00:00:00 2001
From: Timur Shemsedinov <timur.shemsedinov@gmail.com>
Date: Fri, 29 Nov 2024 20:19:59 +0200
Subject: [PATCH 1/4] Add Future implementation

---
 dist.js       |  1 +
 lib/future.js | 63 +++++++++++++++++++++++++++++++++++++++++++++++++++
 metautil.js   |  1 +
 3 files changed, 65 insertions(+)
 create mode 100644 lib/future.js

diff --git a/dist.js b/dist.js
index dbda61ba..5c1af92b 100644
--- a/dist.js
+++ b/dist.js
@@ -6,6 +6,7 @@ module.exports = {
   ...require('./lib/datetime.js'),
   ...require('./lib/error.js'),
   ...require('./lib/events.js'),
+  ...require('./lib/future.js'),
   ...require('./lib/http.js'),
   ...require('./lib/objects.js'),
   ...require('./lib/pool.js'),
diff --git a/lib/future.js b/lib/future.js
new file mode 100644
index 00000000..cbfd5969
--- /dev/null
+++ b/lib/future.js
@@ -0,0 +1,63 @@
+'use strict';
+
+class Future {
+  #executor;
+
+  constructor(executor) {
+    this.#executor = executor;
+  }
+
+  static of(value) {
+    return new Future((resolve) => resolve(value));
+  }
+
+  chain(fn) {
+    return new Future((resolve, reject) =>
+      this.fork(
+        (value) => fn(value).fork(resolve, reject),
+        (error) => reject(error),
+      ),
+    );
+  }
+
+  map(fn) {
+    return new Future((resolve, reject) =>
+      this.fork(
+        (value) =>
+          new Future((resolve, reject) => {
+            try {
+              resolve(fn(value));
+            } catch (error) {
+              reject(error);
+            }
+          }).fork(resolve, reject),
+        (error) => reject(error),
+      ),
+    );
+  }
+
+  fork(successed, failed) {
+    this.#executor(successed, failed);
+  }
+
+  promise() {
+    return new Promise((resolve, reject) => {
+      this.fork(
+        (value) => resolve(value),
+        (error) => reject(error),
+      );
+    });
+  }
+}
+
+const futurify =
+  (fn) =>
+  (...args) =>
+    new Future((resolve, reject) => {
+      fn(...args, (err, data) => {
+        if (err) reject(err);
+        else resolve(data);
+      });
+    });
+
+module.exports = { Future, futurify };
diff --git a/metautil.js b/metautil.js
index c748ee43..14fc374c 100644
--- a/metautil.js
+++ b/metautil.js
@@ -9,6 +9,7 @@ module.exports = {
   ...require('./lib/error.js'),
   ...require('./lib/events.js'),
   ...require('./lib/fs.js'),
+  ...require('./lib/future.js'),
   ...require('./lib/http.js'),
   ...require('./lib/network.js'),
   ...require('./lib/objects.js'),

From afc5a109cbdf3a82a35e83af14b4a88dd45d5e62 Mon Sep 17 00:00:00 2001
From: Timur Shemsedinov <timur.shemsedinov@gmail.com>
Date: Sat, 30 Nov 2024 23:35:27 +0200
Subject: [PATCH 2/4] fixup! Add Future implementation

---
 lib/future.js | 7 ++-----
 1 file changed, 2 insertions(+), 5 deletions(-)

diff --git a/lib/future.js b/lib/future.js
index cbfd5969..0ba5b950 100644
--- a/lib/future.js
+++ b/lib/future.js
@@ -40,12 +40,9 @@ class Future {
     this.#executor(successed, failed);
   }
 
-  promise() {
+  toPromise() {
     return new Promise((resolve, reject) => {
-      this.fork(
-        (value) => resolve(value),
-        (error) => reject(error),
-      );
+      this.fork(resolve, reject);
     });
   }
 }

From 1726eb3b08eb2e5e770abc935964ca03b9a5eed5 Mon Sep 17 00:00:00 2001
From: Timur Shemsedinov <timur.shemsedinov@gmail.com>
Date: Sat, 30 Nov 2024 23:39:25 +0200
Subject: [PATCH 3/4] Add Future..toThenable()

---
 lib/future.js | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/lib/future.js b/lib/future.js
index 0ba5b950..2b21db6e 100644
--- a/lib/future.js
+++ b/lib/future.js
@@ -45,6 +45,13 @@ class Future {
       this.fork(resolve, reject);
     });
   }
+
+  toThenable() {
+    const then = (resolve, reject) => {
+      this.fork(resolve, reject);
+    };
+    return { then };
+  }
 }
 
 const futurify =

From 348b298c251f145cc5a9a04bf4a4a9415d90825a Mon Sep 17 00:00:00 2001
From: Timur Shemsedinov <timur.shemsedinov@gmail.com>
Date: Sat, 30 Nov 2024 23:41:43 +0200
Subject: [PATCH 4/4] fixup! Add Future implementation

---
 lib/future.js | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/lib/future.js b/lib/future.js
index 2b21db6e..974318b4 100644
--- a/lib/future.js
+++ b/lib/future.js
@@ -41,9 +41,9 @@ class Future {
   }
 
   toPromise() {
-    return new Promise((resolve, reject) => {
-      this.fork(resolve, reject);
-    });
+    const { promise, resolve, reject } = Promise.withResolvers();
+    this.fork(resolve, reject);
+    return promise;
   }
 
   toThenable() {