Added generic stream packer

src/export/packer/stream.ts

@@ -0,0 +1,25 @@
+import { Readable, Transform } from "stream";
+import { File } from "../../file";
+import { Compiler } from "./compiler";
+import { IPacker } from "./packer";
+
+class Pipe extends Transform {
+    public _transform(chunk: Buffer | string, encoding: string, callback: () => void): void {
+        this.push(chunk, encoding);
+        callback();
+    }
+}
+
+export class StreamPacker implements IPacker {
+    private readonly compiler: Compiler;
+
+    constructor(file: File) {
+        this.compiler = new Compiler(file);
+    }
+
+    public pack(): Readable {
+        const pipe = new Pipe();
+        this.compiler.compile(pipe);
+        return pipe;
+    }
+}