refactor(std): add std/_util/os.ts module (#8370)

This commit adds "std/_util/os.ts" module which contains
common os detection logic and is browser compatible.

Co-authored-by: Nayeem Rahman <nayeemrmn99@gmail.com>

3 files changed, 3 insertions, 6 deletions

diff --git a/std/fs/copy.ts b/std/fs/copy.ts
index 10bf89186..1bb0a6aff 100644
--- a/std/fs/copy.ts
+++ b/std/fs/copy.ts
@@ -3,8 +3,7 @@ import * as path from "../path/mod.ts";
 import { ensureDir, ensureDirSync } from "./ensure_dir.ts";
 import { getFileInfoType, isSubdir } from "./_util.ts";
 import { assert } from "../_util/assert.ts";
-
-const isWindows = Deno.build.os === "windows";
+import { isWindows } from "../_util/os.ts";
 
 export interface CopyOptions {
   /**
diff --git a/std/fs/ensure_symlink.ts b/std/fs/ensure_symlink.ts
index 7c68d05e2..b57abe907 100644
--- a/std/fs/ensure_symlink.ts
+++ b/std/fs/ensure_symlink.ts
@@ -3,8 +3,7 @@ import * as path from "../path/mod.ts";
 import { ensureDir, ensureDirSync } from "./ensure_dir.ts";
 import { exists, existsSync } from "./exists.ts";
 import { getFileInfoType } from "./_util.ts";
-
-const isWindows = Deno.build.os == "windows";
+import { isWindows } from "../_util/os.ts";
 
 /**
  * Ensures that the link exists.
diff --git a/std/fs/expand_glob.ts b/std/fs/expand_glob.ts
index db60b2465..390df4932 100644
--- a/std/fs/expand_glob.ts
+++ b/std/fs/expand_glob.ts
@@ -16,8 +16,7 @@ import {
   walkSync,
 } from "./walk.ts";
 import { assert } from "../_util/assert.ts";
-
-const isWindows = Deno.build.os == "windows";
+import { isWindows } from "../_util/os.ts";
 
 export interface ExpandGlobOptions extends Omit<GlobOptions, "os"> {
   root?: string;