Add definitions for concat-stream (#13851)

concat-stream/concat-stream-tests.ts

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+import concat = require("concat-stream")
+
+import { Readable } from "stream";
+
+class MyReadable extends Readable {
+  i: number = 1;
+  _read() {
+    if (this.i <= 100) {
+      this.push(this.i.toString());
+      this.i++;
+    } else {
+      this.push(null);
+    }
+  }
+}
+
+let myReadable = new MyReadable();
+
+myReadable.pipe(concat((buf) => console.log(buf.toString())));
+myReadable.pipe(concat({}, (buf) => console.log(buf.toString())));

concat-stream/index.d.ts

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+// Type definitions for concat-stream 1.6
+// Project: https://github.com/maxogden/concat-stream
+// Definitions by: Joey Marianer <https://github.com/jmarianer>
+// Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
+
+/// <reference types="node" />
+
+import { Writable } from "stream";
+
+interface ConcatOpts {
+  encoding?: string;
+}
+
+declare function concat(cb: (buf: Buffer) => void): Writable;
+declare function concat(opts: ConcatOpts, cb: (buf: Buffer) => void): Writable;
+
+export = concat;

concat-stream/tsconfig.json

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+{
+    "compilerOptions": {
+        "module": "commonjs",
+        "target": "es6",
+        "noImplicitAny": true,
+        "noImplicitThis": true,
+        "strictNullChecks": true,
+        "baseUrl": "../",
+        "typeRoots": [
+            "../"
+        ],
+        "types": [],
+        "noEmit": true,
+        "forceConsistentCasingInFileNames": true
+    },
+    "files": [
+        "index.d.ts",
+        "concat-stream-tests.ts"
+    ]
+}

concat-stream/tslint.json

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+{ "extends": "../tslint.json" }