Add an initial definition for

msgpack5/index.d.ts

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+// Type definitions for msgpack5 v3.4.0
+// Project: https://github.com/mcollina/msgpack5/
+// Definitions by: Wonshik Kim <https://github.com/wokim/>
+// Definitions by: Kei Son <https://github.com/heycalmdown/>
+// Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
+
+import stream = require('stream');
+import bl = require('bl');
+  
+interface Options {
+  forceFloat64: boolean;
+  compatibilityMode: boolean;
+}
+
+declare namespace msgpack5 {
+  interface Options {
+    header?: boolean;
+    msgpack?: any;
+  }
+
+  class Base extends stream.Transform {
+    protected _header: any;
+    protected _msgpack: any;
+  }  
+
+  class Encoder extends Base {
+    constructor(opts?: Options);
+    public _transform(obj: any, enc: any, done: Function): any;
+  }
+
+  class Decoder extends Base {
+    constructor(opts?: Options);
+    public _chunks: bl;
+    public _length: number;
+    public _transform(buf: any, enc: any, done: Function): any;
+  }
+
+  interface MessagePack {
+    encode(obj: any): bl;
+    decode<T>(buf: Buffer): T;
+    decode<T>(buf: bl): T;
+    register(type: number, $constructor: any, encode: (obj: any) => Buffer, decode: (data: Buffer) => any): any;
+    registerEncoder(check: (obj: any) => boolean, encode: (obj: any) => Buffer): any;
+    registerDecoder(type: number, decode: (data: Buffer) => any): any;
+    encoder(opts?: Options): Encoder;
+    decoder(opts?: Options): Decoder;
+  }
+}
+
+declare function msgpack5(opts?: Options): msgpack5.MessagePack;
+
+export = msgpack5;

msgpack5/msgpack5-test.ts

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+import * as msgpack5 from 'msgpack5';
+
+const packer = msgpack5();
+const IN = {};
+const OUT = packer.decode(packer.encode(IN));
+

msgpack5/tsconfig.json

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+{
+    "compilerOptions": {
+        "module": "commonjs",
+        "moduleResolution": "node",
+        "target": "es6",
+        "noImplicitAny": true,
+        "strictNullChecks": false,
+        "baseUrl": "../",
+        "typeRoots": [
+            "../"
+        ],
+        "types": [],
+        "noEmit": true,
+        "forceConsistentCasingInFileNames": true
+    },
+    "files": [
+        "index.d.ts",
+        "msgpack5-test.ts"
+    ]
+}