feat(types): Add typings for "multistream" package

types/multistream/index.d.ts

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+// Type definitions for multistream 2.1
+// Project: https://github.com/feross/multistream
+// Definitions by: mrmlnc <https://github.com/mrmlnc>
+// Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
+
+/// <reference types="node" />
+
+import { Stream } from 'stream';
+
+declare function multistream(streams: multistream.Streams): NodeJS.ReadableStream;
+
+declare namespace multistream {
+    type LazyStream = () => Stream;
+    type FactoryStream = (cb: (err: Error | null, stream: NodeJS.ReadableStream) => any) => void;
+    type Streams = Array<LazyStream | NodeJS.ReadableStream> | FactoryStream;
+
+    function obj(streams: Streams): NodeJS.ReadableStream;
+}
+
+export = multistream;

types/multistream/multistream-tests.ts

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+import fs = require('fs');
+import stream = require('stream');
+
+import through = require('through');
+import through2 = require('through2');
+import multistream = require('multistream');
+
+const readable = new stream.Readable();
+const writable = new stream.Writable();
+const transform = new stream.Transform();
+const duplex = new stream.Duplex();
+const pass = new stream.PassThrough();
+
+const streams = [
+    readable,
+    transform,
+    duplex,
+    pass,
+    through(),
+    through2(),
+    fs.createReadStream('.filepath'),
+    () => fs.createWriteStream('.filepath2')
+];
+
+const factory: multistream.FactoryStream = (cb) => {
+    if (1 === 1) return cb(null, fs.createReadStream('.filepath'));
+
+    cb(null, fs.createReadStream('.filepath'));
+};
+
+// $ExpectType ReadableStream
+multistream(streams);
+multistream(factory);
+
+// $ExpectType ReadableStream
+multistream.obj(streams);
+multistream.obj(factory);
+
+// $ExpectError
+multistream([writable]);

types/multistream/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",
+        "multistream-tests.ts"
+    ]
+}

types/multistream/tslint.json

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