feat: Add types for group-array (#41819)

Signed-off-by: Richie Bendall <richiebendall@gmail.com>

types/group-array/group-array-tests.ts

@@ -0,0 +1,12 @@
+import groupArray = require("group-array");
+
+const input = [
+    { tag: 'one', content: 'A' },
+    { tag: 'one', content: 'B' },
+    { tag: 'two', content: 'C' },
+    { tag: 'two', content: 'D' },
+    { tag: 'three', content: 'E' },
+    { tag: 'three', content: 'F' }
+];
+
+groupArray(input, 'tag'); // $ExpectType object

types/group-array/index.d.ts

@@ -0,0 +1,9 @@
+// Type definitions for group-array 1.0
+// Project: https://github.com/doowb/group-array
+// Definitions by: Richie Bendall <https://github.com/Richienb>
+// Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
+
+declare function groupArray(arr: object[], ...props: string[]): object;
+declare function groupArray(arr: object[]): object[];
+
+export = groupArray;

types/group-array/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",
+        "group-array-tests.ts"
+    ]
+}

types/group-array/tslint.json

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