feat(is-relative-path): type definition for v2 (#42780)

- type definitions
- tests

https://github.com/mrjoelkemp/is-relative-path#usage

Thanks!

types/is-relative-path/index.d.ts

@@ -0,0 +1,11 @@
+// Type definitions for is-relative-path 2.0
+// Project: https://github.com/mrjoelkemp/is-relative-path
+// Definitions by: Piotr Błażejewicz (Peter Blazejewicz) <https://github.com/peterblazejewicz>
+// Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
+
+/**
+ * Is relative path?
+ */
+declare function isRelative(path: string): boolean;
+
+export = isRelative;

types/is-relative-path/is-relative-path-tests.ts

@@ -0,0 +1,3 @@
+import isRelative = require('is-relative-path');
+
+isRelative('.'); // $ExpectType boolean

types/is-relative-path/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",
+        "is-relative-path-tests.ts"
+    ]
+}

types/is-relative-path/tslint.json

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