isLink method
Future<bool> isLink(Checks if type(path, followLinks: false) returns FileSystemEntityType.LINK.
Source
static Future<bool> isLink(String path) => _getTypeAsync(path, false)
.then((type) => (type == FileSystemEntityType.LINK._type));
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https://api.dartlang.org/stable/1.24.3/dart-io/FileSystemEntity/isLink.html