[@types/map-to-obj] New type definition (#37638)

* [@types/map-to-obj] New type definition

* [@types/map-to-obj] Fixed typo

types/map-to-obj/index.d.ts

@@ -0,0 +1,13 @@
+// Type definitions for map-to-obj 0.2
+// Project: https://github.com/egoist/map-to-obj#readme
+// Definitions by: Jason Kwok <https://github.com/JasonHK>
+// Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
+// TypeScript Version: 2.9
+
+/**
+ * Convert a `Map` instance into a plain `object`.
+ * @param map The target to be converted
+ */
+declare function MapToObj<K extends string | number | symbol, V>(map: Map<K, V>): Record<K, V>;
+
+export = MapToObj;

types/map-to-obj/map-to-obj-tests.ts

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+'use strict';
+
+import MapToObj from 'map-to-obj';
+
+// $ExpectType Record<any, any>
+MapToObj(new Map());
+
+// $ExpectType Record<string, string>
+MapToObj(new Map([['hello', 'world']]));
+
+// $ExpectType Record<number, number>
+MapToObj(new Map([[0, 1]]));
+
+// $ExpectType Record<symbol, symbol>
+MapToObj(new Map([[Symbol('hello'), Symbol('world')]]));
+
+// $ExpectError
+MapToObj(new Map([[{}, {}]]));

types/map-to-obj/tsconfig.json

@@ -0,0 +1,25 @@
+{
+    "compilerOptions": {
+        "module": "commonjs",
+        "lib": [
+            "es6"
+        ],
+        "noImplicitAny": true,
+        "noImplicitThis": true,
+        "strictFunctionTypes": true,
+        "strictNullChecks": true,
+        "baseUrl": "../",
+        "typeRoots": [
+            "../"
+        ],
+        "types": [],
+        "noEmit": true,
+        "forceConsistentCasingInFileNames": true,
+        "allowSyntheticDefaultImports": true,
+        "esModuleInterop": true
+    },
+    "files": [
+        "index.d.ts",
+        "map-to-obj-tests.ts"
+    ]
+}

types/map-to-obj/tslint.json

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