Created type definition & wrote test case

types/mongoose-simple-random/index.d.ts

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+// Type definitions for mongoose-simple-random 0.4
+// Project: https://github.com/larryprice/mongoose-simple-random
+// Definitions by: My Self <https://github.com/me>
+// Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
+/// <reference types="mongoose" />
+
+declare module "mongoose" {
+    interface Model<T extends Document> extends NodeJS.EventEmitter, ModelProperties {
+        findRandom(conditions: Object, projection?: Object | null, options?: Object | null, callback?: (err: any, res: T[]) => void)
+            : void;
+    }
+}

types/mongoose-simple-random/mongoose-simple-random-tests.ts

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+import * as mongoose from 'mongoose';
+
+// test compatibility with other libraries - from @types/mongoose
+import * as _ from 'lodash';
+import * as fs from "fs";
+
+mongoose.Model.findRandom({
+    username: { $ne: "DummyUser" },
+    rating: {
+        $gt: 1,
+        $lt: 11,
+    },
+}, {}, { limit: 1 }, (error, data) => {
+    if (error) { console.error("Error!"); } else { console.log("Success!"); }
+});

types/mongoose-simple-random/tsconfig.json

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+{
+    "compilerOptions": {
+        "module": "commonjs",
+        "lib": [
+            "es6"
+        ],
+        "noImplicitAny": true,
+        "noImplicitThis": true,
+        "strictNullChecks": true,
+        "baseUrl": "../",
+        "typeRoots": [
+            "../"
+        ],
+        "types": [],
+        "noEmit": true,
+        "forceConsistentCasingInFileNames": true
+    },
+    "files": [
+        "index.d.ts",
+        "mongoose-simple-random-tests.ts"
+    ]
+}

types/mongoose-simple-random/tslint.json

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