🤖 Merge PR #63825 [add] Add typings for add npm package by @LeoDog896

* [add] Add typings

* Change arrays to readonly

* Use = instead of default for export

* Properly export default function using namespaces

types/add/add-tests.ts

@@ -0,0 +1,26 @@
+import add = require("add");
+const { dumbSum, fastTwoSum, nextPowerTwo } = add;
+
+// $ExpectType number
+add([0.1, 0.2]);
+
+// @ts-expect-error
+add(15, 14);
+
+// $ExpectType number
+dumbSum([15, 14]);
+
+// @ts-expect-error
+dumbSum(20, "a");
+
+// $ExpectType [number, number, null]
+fastTwoSum(1 / 3, 1 / 6);
+
+// @ts-expect-error
+fastTwoSum(1 / 3);
+
+// $ExpectType number
+nextPowerTwo(1534);
+
+// @ts-expect-error
+nextPowerTwo(new Symbol());

types/add/index.d.ts

@@ -0,0 +1,19 @@
+// Type definitions for add 2.0
+// Project: https://github.com/ben-ng/add
+// Definitions by: Tristan F. <https://github.com/LeoDog896>
+// Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
+
+declare function accSum(numbers: ReadonlyArray<number>): number;
+
+export = accSum;
+
+declare namespace accSum {
+    function dumbSum(numbers: ReadonlyArray<number>): number;
+    function fastTwoSum(a: number, b: number): [number, number, null];
+
+    /**
+     * Finds the immediate power of 2 that is larger than p
+     * in a fast way
+     */
+    function nextPowerTwo(p: number): number;
+}

types/add/tsconfig.json

@@ -0,0 +1,23 @@
+{
+    "compilerOptions": {
+        "module": "commonjs",
+        "lib": [
+            "es6"
+        ],
+        "noImplicitAny": true,
+        "noImplicitThis": true,
+        "strictFunctionTypes": true,
+        "strictNullChecks": true,
+        "baseUrl": "../",
+        "typeRoots": [
+            "../"
+        ],
+        "types": [],
+        "noEmit": true,
+        "forceConsistentCasingInFileNames": true
+    },
+    "files": [
+        "index.d.ts",
+        "add-tests.ts"
+    ]
+}

types/add/tslint.json

@@ -0,0 +1 @@
+{ "extends": "@definitelytyped/dtslint/dt.json" }