Import dart:io directly (flutter#77)

CHANGELOG.md

@@ -1,3 +1,12 @@
+#### 3.0.0
+
+* Import `dart:io` unconditionally. More recent Dart SDK revisions allow
+  `dart:io` to be imported in a browser context, though if methods are actually
+  invoked, they will fail. This matches well with `package:file`, where users
+  can use the `memory` library and get in-memory implementations of the
+  `dart:io` interfaces.
+* Bump minimum Dart SDK to `1.24.0`
+
 #### 2.3.7
 
 * Fix Dart 2 error.

lib/src/backends/local.dart

@@ -12,8 +12,6 @@ import 'package:file/src/io.dart' as io;
 import 'package:file/file.dart';
 import 'package:path/path.dart' as p;
 
-import '../io/shim.dart' as shim;
-
 part 'local/local_directory.dart';
 part 'local/local_file.dart';
 part 'local/local_file_system.dart';

lib/src/backends/local/local_file_system.dart

@@ -14,13 +14,13 @@ class LocalFileSystem extends FileSystem {
 
   @override
   Directory directory(dynamic path) =>
-      new _LocalDirectory(this, shim.newDirectory(getPath(path)));
+      new _LocalDirectory(this, new io.Directory(getPath(path)));
 
   @override
-  File file(dynamic path) => new _LocalFile(this, shim.newFile(getPath(path)));
+  File file(dynamic path) => new _LocalFile(this, new io.File(getPath(path)));
 
   @override
-  Link link(dynamic path) => new _LocalLink(this, shim.newLink(getPath(path)));
+  Link link(dynamic path) => new _LocalLink(this, new io.Link(getPath(path)));
 
   @override
   p.Context get path => new p.Context();
@@ -30,36 +30,36 @@ class LocalFileSystem extends FileSystem {
   /// platform-dependent, and may be set by an environment variable.
   @override
   Directory get systemTempDirectory =>
-      new _LocalDirectory(this, shim.systemTemp());
+      new _LocalDirectory(this, io.Directory.systemTemp);
 
   @override
-  Directory get currentDirectory => directory(shim.currentDirectory.path);
+  Directory get currentDirectory => directory(io.Directory.current.path);
 
   @override
-  set currentDirectory(dynamic path) => shim.currentDirectory = path;
+  set currentDirectory(dynamic path) => io.Directory.current = path;
 
   @override
-  Future<io.FileStat> stat(String path) => shim.stat(path);
+  Future<io.FileStat> stat(String path) => io.FileStat.stat(path);
 
   @override
-  io.FileStat statSync(String path) => shim.statSync(path);
+  io.FileStat statSync(String path) => io.FileStat.statSync(path);
 
   @override
   Future<bool> identical(String path1, String path2) =>
-      shim.identical(path1, path2);
+      io.FileSystemEntity.identical(path1, path2);
 
   @override
   bool identicalSync(String path1, String path2) =>
-      shim.identicalSync(path1, path2);
+      io.FileSystemEntity.identicalSync(path1, path2);
 
   @override
-  bool get isWatchSupported => shim.isWatchSupported;
+  bool get isWatchSupported => io.FileSystemEntity.isWatchSupported;
 
   @override
   Future<io.FileSystemEntityType> type(String path, {bool followLinks: true}) =>
-      shim.type(path, followLinks);
+      io.FileSystemEntity.type(path, followLinks: followLinks);
 
   @override
   io.FileSystemEntityType typeSync(String path, {bool followLinks: true}) =>
-      shim.typeSync(path, followLinks);
+      io.FileSystemEntity.typeSync(path, followLinks: followLinks);
 }

lib/src/io.dart

@@ -8,10 +8,7 @@
 /// the `file` package. The `file` package re-exports these interfaces (or in
 /// some cases, implementations of these interfaces by the same name), so this
 /// file need not be exposes publicly and exists for internal use only.
-///
-/// For VM users, this exports the actual `dart:io` interfaces; for browser
-/// contexts, this exports locally-defined versions of those same interfaces.
-export 'io/interface.dart' if (dart.library.io) 'dart:io'
+export 'dart:io'
     show
         Directory,
         File,