Bug 1795796 - Port bug 1794697: Write files with "\n" line endings when esmifying. r=mkmelin

Prevents files being written with default "\r\n" line endings when run on Windows.
Ensures consistency with the rest of the tree.

Differential Revision: https://phabricator.services.mozilla.com/D159552

--HG--
extra : moz-landing-system : lando

tools/esmify/mach_commands.py

@@ -437,7 +437,7 @@ def try_rename_in(command_context, path, target, jsm_name, esm_name, jsm_path):
     if modified:
         info(f"  {str(target_path)}")
         info(f"    {jsm_name} => {esm_name}")
-        with open(target_path, "w") as f:
+        with open(target_path, "w", newline="\n") as f:
             f.write(content)
 
     return True
@@ -472,7 +472,7 @@ def try_rename_components_conf(command_context, path, jsm_name, esm_name):
     info(f"    {jsm_name} => {esm_name}")
 
     content = prop_re.sub(r"'esModule':\1" + esm_name, content)
-    with open(target_path, "w") as f:
+    with open(target_path, "w", newline="\n") as f:
         f.write(content)
 
     return True