Added Bundle.prototype.files getter to prevent exposing filesSymbol

spec/Bundle.ts

@@ -1,5 +1,5 @@
 import { Stream } from "stream";
-import { default as Bundle, filesSymbol } from "../lib/Bundle";
+import { default as Bundle } from "../lib/Bundle";
 
 describe("Bundle", () => {
 	let bundle: InstanceType<typeof Bundle>;
@@ -24,7 +24,7 @@ describe("Bundle", () => {
 		const buffer = Buffer.alloc(0);
 		bundle.addBuffer("pass.json", buffer);
 
-		expect(bundle[filesSymbol]).toEqual({ "pass.json": buffer });
+		expect(bundle.files).toEqual({ "pass.json": buffer });
 	});
 
 	it("should throw error if freezed", async () => {

src/Bundle.ts

@@ -1,7 +1,7 @@
 import { Stream } from "stream";
 import { ZipFile } from "yazl";
 
-export const filesSymbol = Symbol("bundleFiles");
+const filesSymbol = Symbol("bundleFiles");
 const bundleStateSymbol = Symbol("state");
 const archiveSymbol = Symbol("zip");
 
@@ -78,6 +78,14 @@ export default class Bundle {
 		return this[bundleStateSymbol] === BundleState.CLOSED;
 	}
 
+	/**
+	 * Returns the list of files added to the bundle
+	 */
+
+	public get files() {
+		return this[filesSymbol];
+	}
+
 	/**
 	 * Allows files to be added to the bundle.
 	 * If the bundle is closed, it will throw an error.

src/PKPass.ts

@@ -1,5 +1,5 @@
 import FieldsArray from "./fieldsArray";
-import { default as Bundle, filesSymbol } from "./Bundle";
+import { default as Bundle } from "./Bundle";
 import { getModelFolderContents } from "./parser";
 import * as Schemas from "./schemas";
 import { Stream } from "stream";
@@ -73,7 +73,7 @@ export default class PKPass extends Bundle {
 			certificates = source.certificates;
 			buffers = {};
 
-			const buffersEntries = Object.entries(source[filesSymbol]);
+			const buffersEntries = Object.entries(source.files);
 
 			/** Cloning all the buffers to prevent unwanted edits */
 			for (let i = 0; i < buffersEntries.length; i++) {
@@ -285,7 +285,7 @@ export default class PKPass extends Bundle {
 		}
 
 		if (/pass\.json/.test(pathName)) {
-			if (this[filesSymbol]["pass.json"]) {
+			if (this.files["pass.json"]) {
 				/**
 				 * Ignoring any further addition. In a
 				 * future we might consider merging instead
@@ -374,7 +374,7 @@ export default class PKPass extends Bundle {
 	}
 
 	private [createManifestSymbol]() {
-		return Object.entries(this[filesSymbol]).reduce<Schemas.Manifest>(
+		return Object.entries(this.files).reduce<Schemas.Manifest>(
 			(acc, [fileName, buffer]) => {
 				const hashFlow = forge.md.sha1.create();