- Add getters for the current packageRoot or packageMap.

sdk/lib/isolate/isolate.dart

Index: sdk/lib/isolate/isolate.dart
diff --git a/sdk/lib/isolate/isolate.dart b/sdk/lib/isolate/isolate.dart
index c67122049f1a8e543e21ceb2cbb1af7b176a25a8..d6b4c0b5b41e50ff1b0005640f2b9f614965559f 100644
--- a/sdk/lib/isolate/isolate.dart
+++ b/sdk/lib/isolate/isolate.dart
@@ -127,6 +127,29 @@ class Isolate {
   external static Isolate get current;
 
   /**
+   * Returns the package root of the current isolate, if any.
+   *
+   * If the isolate is using a [packageMap], this getter returns `null`,
+   * otherwise it returns the package root - a directory that package
+   * URIs are resolved against.
+   */
+  external static Future<Uri> get packageRoot;

[nweiz, 2015/10/06 23:33:21]

Are there any guarantees about whether this is absolute?

[Lasse Reichstein Nielsen, 2015/10/07 07:48:28]

It should be absolute. We should add this to the documentation.

+
+  /**
+   * Returns the package mapping of the current isolate, if any.
+   *
+   * If the current isolate is using a [packageRoot], this getter
+   * returns `null`.
+   *
+   * The package map maps the name of a package that is available to the
+   * program, to a URI that package URIs for that package are resolved against.
+   *
+   * Returns an empty map if the isolate does not have a way to resolve package
+   * URIs.
+   */
+  external static Future<Map<String, Uri>> get packageMap;
+
+  /**
    * Creates and spawns an isolate that shares the same code as the current
    * isolate.
    *