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/stat.ts

@@ -0,0 +1,84 @@
+// Copyright 2018-2020 the Deno authors. All rights reserved. MIT license.
+import { sendSync, sendAsync } from "../dispatch_json.ts";
+import { FileInfo, FileInfoImpl } from "../../file_info.ts";
+
+/** @internal */
+export interface StatResponse {
+  isFile: boolean;
+  isSymlink: boolean;
+  len: number;
+  modified: number;
+  accessed: number;
+  created: number;
+  name: string | null;
+  // Unix only members
+  dev: number;
+  ino: number;
+  mode: number;
+  nlink: number;
+  uid: number;
+  gid: number;
+  rdev: number;
+  blksize: number;
+  blocks: number;
+}
+
+/** Resolves to a `Deno.FileInfo` for the specified `path`. If `path` is a
+ * symlink, information for the symlink will be returned.
+ *
+ *       const fileInfo = await Deno.lstat("hello.txt");
+ *       assert(fileInfo.isFile());
+ *
+ * Requires `allow-read` permission. */
+export async function lstat(path: string): Promise<FileInfo> {
+  const res = (await sendAsync("op_stat", {
+    path,
+    lstat: true
+  })) as StatResponse;
+  return new FileInfoImpl(res);
+}
+
+/** Synchronously returns a `Deno.FileInfo` for the specified `path`. If
+ * `path` is a symlink, information for the symlink will be returned.
+ *
+ *       const fileInfo = Deno.lstatSync("hello.txt");
+ *       assert(fileInfo.isFile());
+ *
+ * Requires `allow-read` permission. */
+export function lstatSync(path: string): FileInfo {
+  const res = sendSync("op_stat", {
+    path,
+    lstat: true
+  }) as StatResponse;
+  return new FileInfoImpl(res);
+}
+
+/** Resolves to a `Deno.FileInfo` for the specified `path`. Will always
+ * follow symlinks.
+ *
+ *       const fileInfo = await Deno.stat("hello.txt");
+ *       assert(fileInfo.isFile());
+ *
+ * Requires `allow-read` permission. */
+export async function stat(path: string): Promise<FileInfo> {
+  const res = (await sendAsync("op_stat", {
+    path,
+    lstat: false
+  })) as StatResponse;
+  return new FileInfoImpl(res);
+}
+
+/** Synchronously returns a `Deno.FileInfo` for the specified `path`. Will
+ * always follow symlinks.
+ *
+ *       const fileInfo = Deno.statSync("hello.txt");
+ *       assert(fileInfo.isFile());
+ *
+ * Requires `allow-read` permission. */
+export function statSync(path: string): FileInfo {
+  const res = sendSync("op_stat", {
+    path,
+    lstat: false
+  }) as StatResponse;
+  return new FileInfoImpl(res);
+}