add types for weighted-random-object (#36885)

types/weighted-random-object/index.d.ts

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+// Type definitions for weighted-random-object 1.0
+// Project: https://github.com/misund/weighted-random-object
+// Definitions by: mike castleman <https://github.com/mlc>
+// Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
+
+// TypeScript Version: 2.7
+
+interface Weighted {
+    weight: number;
+}
+
+declare function weightedRandomObject<T extends Weighted>(objects: ReadonlyArray<T>): T;
+
+export = weightedRandomObject;

types/weighted-random-object/tsconfig.json

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

types/weighted-random-object/tslint.json

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

types/weighted-random-object/weighted-random-object-tests.ts

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+import weightedRandomObject from 'weighted-random-object';
+
+interface MyObject {
+    data: string;
+    weight: number;
+}
+
+const objs: MyObject[] = [{ data: 'a', weight: 7 }, { data: 'b', weight: 5 }];
+
+weightedRandomObject(objs); // $ExpectType MyObject
+
+weightedRandomObject([{ f: 5, weight: 1 }, { f: 9, weight: 2 }]).f; // $ExpectType number