Convert fs-utils module to typescript

Change-type: patch
Signed-off-by: Cameron Diver <cameron@resin.io>

src/lib/fs-utils.coffee

@@ -1,24 +0,0 @@
-Promise = require 'bluebird'
-fs = Promise.promisifyAll(require('fs'))
-path = require 'path'
-
-exports.writeAndSyncFile = (path, data) ->
-	fs.openAsync(path, 'w')
-	.then (fd) ->
-		fs.writeAsync(fd, data, 0, 'utf8')
-		.then ->
-			fs.fsyncAsync(fd)
-		.then ->
-			fs.closeAsync(fd)
-
-exports.writeFileAtomic = (path, data) ->
-	exports.writeAndSyncFile("#{path}.new", data)
-	.then ->
-		fs.renameAsync("#{path}.new", path)
-
-exports.safeRename = (src, dest) ->
-	fs.renameAsync(src, dest)
-	.then ->
-		fs.openAsync(path.dirname(dest), 'r')
-	.tap(fs.fsyncAsync)
-	.then(fs.closeAsync)

src/lib/fs-utils.d.ts

@@ -1,3 +0,0 @@
-export function writeAndSyncFile(path: string, data: string): Promise<void>;
-export function writeFileAtomic(path: string, data: string): Promise<void>;
-export function safeRename(src: string, dest: string): Promise<void>;

src/lib/fs-utils.ts

@@ -0,0 +1,24 @@
+import * as Bluebird from 'bluebird';
+import { fs } from 'mz';
+import * as path from 'path';
+
+export function writeAndSyncFile(path: string, data: string): Bluebird<void> {
+	return Bluebird.resolve(fs.open(path, 'w'))
+		.then((fd) => {
+			fs.write(fd, data, 0, 'utf8')
+				.then(() => fs.fsync(fd))
+				.then(() => fs.close(fd));
+		});
+}
+
+export function writeFileAtomic(path: string, data: string): Bluebird<void> {
+	return Bluebird.resolve(writeAndSyncFile(`${path}.new`, data))
+		.then(() => fs.rename(`${path}.new`, path));
+}
+
+export function safeRename(src: string, dest: string): Bluebird<void> {
+	return Bluebird.resolve(fs.rename(src, dest))
+		.then(() => fs.open(path.dirname(dest), 'r'))
+		.tap(fs.fsync)
+		.then(fs.close);
+}