Add type definitions for parallel-transform. (#27312)

types/parallel-transform/index.d.ts

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+// Type definitions for parallel-transform 1.1
+// Project: https://github.com/mafintosh/parallel-transform
+// Definitions by: Daniel Cassidy <https://github.com/djcsdy>
+// Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
+
+/// <reference types="node"/>
+
+import { Transform, TransformOptions, TransformCallback } from "stream";
+
+type OnTransform = (chunk: any, callback: TransformCallback) => void;
+
+declare namespace ParallelTransform {
+    interface Options extends TransformOptions {
+        ordered?: boolean;
+    }
+}
+
+declare const ParallelTransform: {
+    (maxParallel: number, opts: ParallelTransform.Options | undefined | null, ontransform: OnTransform): Transform;
+    (opts: ParallelTransform.Options | number | undefined | null, ontransform: OnTransform): Transform;
+    (ontransform: OnTransform): Transform;
+    new(maxParallel: number, opts: ParallelTransform.Options | undefined | null, ontransform: OnTransform): Transform;
+    new(opts: ParallelTransform.Options | number | undefined | null, ontransform: OnTransform): Transform;
+    new(ontransform: OnTransform): Transform;
+};
+
+export = ParallelTransform;

types/parallel-transform/parallel-transform-tests.ts

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+import transform = require("parallel-transform");
+
+let stream = transform(10, (data, callback) => {
+    setTimeout(() => callback(undefined, data), Math.random() * 1000);
+});
+
+stream.write("1");
+stream.write("2");
+stream.write("3");
+stream.write("4");
+stream.end();
+
+stream.on("data", data => console.log(data.toString()));
+stream.on("end", () => "end of stream");
+
+stream = transform(10, { objectMode: false },
+    (data, callback) => callback(undefined, data));
+
+stream = transform({ ordered: false }, (data, callback) => callback(new Error("fail"), null));

types/parallel-transform/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",
+        "parallel-transform-tests.ts"
+    ]
+}

types/parallel-transform/tslint.json

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