Add type definitions for tiny-async-pool (#29373)

types/tiny-async-pool/index.d.ts

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+// Type definitions for tiny-async-pool 1.0
+// Project: https://github.com/rxaviers/async-pool#readme
+// Definitions by: Karl-Philipp Wulfert <https://github.com/krlwlfrt>
+// Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
+
+/**
+ * This declaration specifies that the function is the exported object from the file
+ */
+export = asyncPool;
+
+/**
+ * Runs multiple promise-returning & async functions in a limited concurrency pool.
+ * It rejects immediately as soon as one of the promises rejects.
+ * It resolves when all the promises completes.
+ * It calls the iterator function as soon as possible (under concurrency limit).
+ *
+ * @param poolLimit The pool limit number (>= 1).
+ * @param array Input array.
+ * @param iteratorFn Iterator function that takes two arguments (array item and the array itself).
+ *                   The iterator function should either return a promise or be an async function.
+ *
+ * @template IN Type of the input array
+ * @template OUT Type of the resolves of the promises
+ */
+declare function asyncPool<IN, OUT>(
+    poolLimit: number,
+    array: ReadonlyArray<IN>,
+    iteratorFn: (generator: IN) => Promise<OUT>
+): Promise<OUT[]>;

types/tiny-async-pool/tiny-async-pool-tests.ts

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+import asyncPool = require('tiny-async-pool');
+
+const expected = JSON.stringify(['A', 'B', 'C']);
+
+asyncPool(5, ['a', 'b', 'c'], (value) => {
+  return new Promise((resolve) => {
+    resolve(value.toUpperCase);
+  });
+}).then((results) => {
+  if (JSON.stringify(results) !== expected) {
+    throw new Error('Result is not equal to expected result!');
+  }
+});

types/tiny-async-pool/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
+    },
+    "files": [
+        "index.d.ts",
+        "tiny-async-pool-tests.ts"
+    ]
+}

types/tiny-async-pool/tslint.json

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