[pathval] Add types for pathval (#37453)

* [pathval] Add types for pathval

* Clean up redundant interfaces, use UMD mod. syntax

Changes requested by @sandersn

- Don't override lint rules in tslint.json
- Use modern UMD module syntax
- Removed redundant namespaces

types/pathval/index.d.ts

@@ -0,0 +1,21 @@
+// Type definitions for pathval 1.1
+// Project: https://www.npmjs.com/package/pathval
+// Definitions by: Rebecca Turner <https://github.com/9999years>
+// Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
+// TypeScript Version: 2.2
+
+export interface PathInfo {
+    parent: object;
+    name: string;
+    value?: any;
+    exists: boolean;
+}
+
+export type Property = string | symbol | number;
+
+export function hasProperty(obj: object | undefined | null, name: Property): boolean;
+export function getPathInfo(obj: object, path: string): PathInfo;
+export function getPathValue(obj: object, path: string): object | undefined;
+export function setPathValue(obj: object, path: string, val: any): object;
+
+export as namespace pathval;

types/pathval/pathval-tests.ts

@@ -0,0 +1,18 @@
+import * as pathval from 'pathval';
+
+const obj = { prop: 'a value' };
+pathval.hasProperty(obj, 'prop'); // true
+
+const earth = { earth: { country: 'Brazil' } };
+pathval.getPathInfo(earth, 'earth.country');
+const info: pathval.PathInfo = {
+    parent: { country: 'Brazil' },
+    name: 'country',
+    value: 'Brazil',
+    exists: true,
+};
+
+pathval.getPathValue(earth, 'earth.country'); // 'Brazil'
+
+pathval.setPathValue(earth, 'earth.country', 'USA');
+const usa: string = earth.earth.country; // 'USA'

types/pathval/tsconfig.json

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

types/pathval/tslint.json

@@ -0,0 +1,3 @@
+{
+    "extends": "dtslint/dt.json"
+}