Use npm's modules to stringify package.json file before save. Fixes #4049

Author: Logikgate

lib/common/declarations.d.ts

@@ -2026,3 +2026,13 @@ interface ILockFile {
 	 */
 	check(lockFilePath?: string, lockFileOpts?: ILockFileOptions): boolean;
 }
+
+declare module "stringify-package" {
+	function stringifyPackage(data: any, indent: any, newline: string): string
+	export = stringifyPackage
+}
+
+declare module "detect-newline" {
+	function detectNewline(data: string): string | null;
+	export = detectNewline
+}

lib/common/file-system.ts

@@ -5,6 +5,8 @@ import * as injector from "./yok";
 import * as crypto from "crypto";
 import * as shelljs from "shelljs";
 import { parseJson } from "./helpers";
+import stringifyPackage = require("stringify-package");
+import detectNewline = require("detect-newline");
 
 // TODO: Add .d.ts for mkdirp module (or use it from @types repo).
 const mkdirp = require("mkdirp");
@@ -205,7 +207,13 @@ export class FileSystem implements IFileSystem {
 			space = this.getIndentationCharacter(filename);
 		}
 
-		return this.writeFile(filename, JSON.stringify(data, null, space), encoding);
+		let stringifiedData = JSON.stringify(data, null, space);
+		if (path.basename(filename) === "package.json") {
+			const newline = detectNewline(stringifiedData);
+			stringifiedData = stringifyPackage(data, space, newline);
+		}
+
+		return this.writeFile(filename, stringifiedData, encoding);
 	}
 
 	public copyFile(sourceFileName: string, destinationFileName: string): void {

npm-shrinkwrap.json

@@ -37,6 +37,7 @@
     "cli-table": "https://github.com/telerik/cli-table/tarball/v0.3.1.2",
     "color": "3.0.0",
     "colors": "1.1.2",
+    "detect-newline": "^2.1.0",
     "email-validator": "1.0.4",
     "esprima": "2.7.0",
     "gaze": "1.1.0",
@@ -73,6 +74,7 @@
     "shelljs": "0.7.6",
     "simple-plist": "0.2.1",
     "source-map": "0.5.6",
+    "stringify-package": "^1.0.0",
     "tabtab": "https://github.com/Icenium/node-tabtab/tarball/master",
     "tar": "4.4.4",
     "temp": "0.8.3",