From 94a475ab212e60b1039879dad6b449647c375f1c Mon Sep 17 00:00:00 2001
From: xzeldon <contact@zeldon.ru>
Date: Thu, 20 Oct 2022 17:37:44 +0300
Subject: [PATCH] - `is` filter

---
 src/filters.ts           | 3 +++
 src/handlers/balabola.ts | 5 ++---
 src/handlers/updates.ts  | 4 ++--
 3 files changed, 7 insertions(+), 5 deletions(-)

diff --git a/src/filters.ts b/src/filters.ts
index dcafadf..baab82a 100644
--- a/src/filters.ts
+++ b/src/filters.ts
@@ -6,6 +6,9 @@ type Predicate<C extends MessageContext> = (ctx: C) => MaybePromise<boolean>;
 export const not = <C extends MessageContext>(predicate: Predicate<C>) => (ctx: C) =>
     Promise.resolve(predicate(ctx)).then((v) => !v);
 
+export const is = <C extends MessageContext>(predicate: Predicate<C>) => (ctx: C) =>
+    Promise.resolve(predicate(ctx)).then((v) => v);
+
 export const isChat = <C extends MessageContext>(ctx: C) =>
     ctx.isChat === true;
 
diff --git a/src/handlers/balabola.ts b/src/handlers/balabola.ts
index b27fb1d..cbcd4c4 100644
--- a/src/handlers/balabola.ts
+++ b/src/handlers/balabola.ts
@@ -1,14 +1,13 @@
 import { Keyboard, MessageContext } from "vk-io";
 import { balabola } from "../balabola_api";
 import { Composer } from "../composer";
-import { isChat, isHasText, not } from "../filters";
+import { is, isHasText } from "../filters";
 import { balabolaQueue } from "../queue";
 
 export const composer = new Composer<MessageContext>();
 
 const filter = composer
-    .filter(not(isChat), composer.compose())
-    .filter(!!not(isHasText), composer.compose());
+    .filter(is(isHasText), composer.compose());
 
 const selectStyleKeyboard = <C extends MessageContext>(ctx: C) => {
     return Keyboard.builder()
diff --git a/src/handlers/updates.ts b/src/handlers/updates.ts
index 55212da..d44ebbd 100644
--- a/src/handlers/updates.ts
+++ b/src/handlers/updates.ts
@@ -1,10 +1,10 @@
 import { MessageContext } from "vk-io";
 import { Composer } from "../composer";
-import { isHasText, not } from "../filters";
+import { is, isHasText } from "../filters";
 import { logger } from "../logger";
 
 export const composer = new Composer<MessageContext>();
-const filter = composer.filter(!!not(isHasText), composer.compose());
+const filter = composer.filter(is(isHasText), composer.compose());
 
 filter.use(async (ctx, next) => {
     const { messagePayload } = ctx;