reorg: move JS ops implementations to cli/js/ops/, part 3 (#4302)

Following JS ops were moved to separate files in cli/js/ops directory:
- net
- tls
- fs

cli/js/ops/fs/utime.ts

@@ -0,0 +1,50 @@
+// Copyright 2018-2020 the Deno authors. All rights reserved. MIT license.
+import { sendSync, sendAsync } from "../dispatch_json.ts";
+
+function toSecondsFromEpoch(v: number | Date): number {
+  return v instanceof Date ? v.valueOf() / 1000 : v;
+}
+
+/** **UNSTABLE**: needs investigation into high precision time.
+ *
+ * Synchronously changes the access and modification times of a file system
+ * object referenced by `path`. Given times are either in seconds (UNIX epoch
+ * time) or as `Date` objects.
+ *
+ *       Deno.utimeSync("myfile.txt", 1556495550, new Date());
+ *
+ * Requires `allow-write` permission. */
+export function utimeSync(
+  path: string,
+  atime: number | Date,
+  mtime: number | Date
+): void {
+  sendSync("op_utime", {
+    path,
+    // TODO(ry) split atime, mtime into [seconds, nanoseconds] tuple
+    atime: toSecondsFromEpoch(atime),
+    mtime: toSecondsFromEpoch(mtime)
+  });
+}
+
+/** **UNSTABLE**: needs investigation into high precision time.
+ *
+ * Changes the access and modification times of a file system object
+ * referenced by `path`. Given times are either in seconds (UNIX epoch time)
+ * or as `Date` objects.
+ *
+ *       await Deno.utime("myfile.txt", 1556495550, new Date());
+ *
+ * Requires `allow-write` permission. */
+export async function utime(
+  path: string,
+  atime: number | Date,
+  mtime: number | Date
+): Promise<void> {
+  await sendAsync("op_utime", {
+    path,
+    // TODO(ry) split atime, mtime into [seconds, nanoseconds] tuple
+    atime: toSecondsFromEpoch(atime),
+    mtime: toSecondsFromEpoch(mtime)
+  });
+}