Add type definitions for unique-push-id (#34323)

types/unique-push-id/index.d.ts

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+// Type definitions for unique-push-id 1.0
+// Project: https://github.com/limit-zero/unique-push-id
+// Definitions by: Nathan Amick <https://github.com/namick>
+// Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
+// TypeScript Version: 2.7
+
+/**
+ * Fancy ID generator that creates 20-character string identifiers with the following properties:
+ *
+ * 1. They're based on timestamp so that they sort *after* any existing ids.
+ * 2. They contain 72-bits of random data after the timestamp so that IDs won't collide with other clients' IDs.
+ * 3. They sort *lexicographically* (so the timestamp is converted to characters that will sort properly).
+ * 4. They're monotonically increasing.  Even if you generate more than one in the same timestamp, the
+ *    latter ones will sort after the former ones.  We do this by using the previous random bits
+ *    but "incrementing" them by 1 (only in the case of a timestamp collision).
+ *
+ * @returns A unique, chronological, lexicographical 20-character string identifier.
+ */
+declare function pushId(): string;
+
+export = pushId;

types/unique-push-id/tsconfig.json

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+{
+    "compilerOptions": {
+        "module": "commonjs",
+        "lib": [
+            "es6"
+        ],
+        "noImplicitAny": true,
+        "noImplicitThis": true,
+        "strictNullChecks": true,
+        "strictFunctionTypes": true,
+        "baseUrl": "../",
+        "typeRoots": [
+            "../"
+        ],
+        "types": [],
+        "noEmit": true,
+        "forceConsistentCasingInFileNames": true,
+        "esModuleInterop": true
+    },
+    "files": [
+        "index.d.ts",
+        "unique-push-id-tests.ts"
+    ]
+}

types/unique-push-id/tslint.json

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+{ "extends": "dtslint/dt.json" }

types/unique-push-id/unique-push-id-tests.ts

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+import pushId from "unique-push-id";
+
+pushId(); // $ExpectType string