initial commit

src/filters.ts

@@ -0,0 +1,13 @@
+import { MessageContext } from "vk-io";
+
+type MaybePromise<T> = T | Promise<T>;
+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 isChat = <C extends MessageContext>(ctx: C) =>
+    ctx.isChat === true;
+
+export const isHasText = <C extends MessageContext>(ctx: C) =>
+    ctx.text ? true : false;