Added pick-weight (#18693)

* Created definitions & tests for pick-weight 🎲

* Fix no-single-module

types/pick-weight/index.d.ts

@@ -0,0 +1,11 @@
+// Type definitions for pick-weight 1.0
+// Project: https://github.com/mock-end/pick-weight#readme
+// Definitions by: Roberts Slisans <https://github.com/rsxdalv>
+// Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
+
+// Dummy function allows to avoid hard to kill or fix tslint warning
+// (exporting pluginFunc will make this a non-importable module)
+declare function weighted<T>(arr: T[], weights: number[]): T;
+// Let allows typescript to still use ES2015 style imports
+declare let y: typeof weighted;
+export = y;

types/pick-weight/pick-weight-tests.ts

@@ -0,0 +1,6 @@
+import * as weight from "pick-weight";
+
+const x = weight(["a", "b", "c"], [1, 2, 3]);
+
+// Can only be applied since inferred type is string
+x === "string";

types/pick-weight/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",
+        "pick-weight-tests.ts"
+    ]
+}

types/pick-weight/tslint.json

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