Use monads pkg

commitlint/tests/integration.test.ts

@@ -1,5 +1,6 @@
 import { runCommitLintOnMsg } from "./testHelpers.js";
 import { test, expect } from "vitest";
+import { Option, Some, None } from '@thames/monads';
 
 class A {
     x: string;
@@ -50,15 +51,6 @@ function fn(p: C) {
     }
 }
 
-class None {}
-class Value<T> {
-    value: T;
-
-    constructor(val: T) {
-        this.value = val;
-    }
-}
-type Option<T> = None | Value<T>;
 
 test("testing DUs", () => {
     let foo = new A();
@@ -75,17 +67,16 @@ test("testing DUs", () => {
 });
 
 function fnO(option: Option<number>) {
-    if (option instanceof None) {
-        return "NAH";
-    } else {
-        let val = option.value;
-        return (val * val).toString();
-    }
+    const message = option.match({
+        some: (res) => (res * res).toString(),
+        none: 'NAH',
+    });
+    return message;
 }
 
 test("testing Options", () => {
-    let foo: Option<number> = new None();
-    let bar: Option<number> = new Value(2);
+    let foo: Option<number> = None;
+    let bar: Option<number> = Some(2);
     expect(fnO(foo)).toBe("NAH");
     expect(fnO(bar)).toBe("4");
 });

package.json

@@ -1,6 +1,7 @@
 {
     "type": "module",
     "dependencies": {
+        "@thames/monads": "^0.7.0",
         "cosmiconfig": "9.0.0"
     },
     "devDependencies": {