added type for bufferhelper (#38954)

* added @type/bufferhelper

* added typescript version

* added space

types/bufferhelper/bufferhelper-tests.ts

@@ -0,0 +1,11 @@
+import BufferHelper from 'bufferhelper';
+
+// test data
+const buffer = new BufferHelper();
+
+// tests
+buffer.concat('');
+buffer.toBuffer().toString();
+buffer.empty();
+buffer.load('', () => {});
+buffer.toString('ascii');

types/bufferhelper/index.d.ts

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+// Type definitions for bufferhelper 0.2
+// Project: https://github.com/JacksonTian/bufferhelper
+// Definitions by: Vladimir Grenaderov <https://github.com/VladimirGrenaderov>,
+//                 Max Boguslavskiy <https://github.com/maxbogus>
+// Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
+// TypeScript Version: 2.7
+
+/// <reference types="node" />
+
+declare namespace BufferHelper {
+    type encoding = 'ascii'|'utf8'|'utf16le'|'ucs2'|'base64'|'binary'|'hex';
+}
+
+declare class BufferHelper {
+    constructor();
+
+    concat(buffer: any): BufferHelper;
+    empty(): BufferHelper;
+    load(stream: any, callback: (arg: any) => any): void;
+    toBuffer(): Buffer;
+    toString(encoding: BufferHelper.encoding): string;
+}
+
+export = BufferHelper;

types/bufferhelper/tsconfig.json

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

types/bufferhelper/tslint.json

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