Resolves opal#1725, Implement File#symlink? for Node.js

CHANGELOG.md

@@ -30,6 +30,7 @@ Whitespace conventions:
 - Added ability to pass the port to the "server" CLI runner using the `OPAL_CLI_RUNNERS_SERVER_PORT` (explicit option passed via CLI is still working but depreted)
 - Added `Array#pack` (supports only `C, S, L, Q, c, s, l, q, A, a` formats). (#1723)
 - Added `String#unpack` (supports only `C, S, L, Q, S>, L>, Q>, c, s, l, q, n, N, v, V, U, w, A, a, Z, B, b, H, h, u, M, m` formats). (#1723)
+- Added `File#symlink?` for Node.js. (#1725)
 
 
 

stdlib/nodejs/file.rb

@@ -153,6 +153,10 @@ def self.mtime path
     `return executeIOAction(function(){return __fs__.statSync(#{path}).mtime})`
   end
 
+  def self.symlink? path
+    `return executeIOAction(function(){return __fs__.lstatSync(#{path}).isSymbolicLink()})`
+  end
+
   # Instance Methods
 
   def initialize(path, flags = 'r')

test/nodejs/test_file.rb

@@ -101,6 +101,13 @@ def test_file_check_with_symlinks
     assert(File.file?('test/nodejs/fixtures/symlink-to-file'),       'test/nodejs/fixtures/symlink-to-file should be a file')
   end unless windows_platform?
 
+  def test_file_symlink?
+    assert(File.symlink?('test/nodejs/fixtures/symlink-to-file'))
+    assert(File.symlink?('test/nodejs/fixtures/symlink-to-directory'))
+    refute(File.symlink?('test/nodejs/fixtures'))
+    refute(File.symlink?('test/nodejs/fixtures/hello.rb'))
+  end unless windows_platform?
+
   def test_file_readable
     assert !File.readable?('tmp/nonexistent')
     File.write('tmp/fuz', "hello")