Only claim "package:" URLs are unsupported on Node (#637)

Closes #630

CHANGELOG.md

@@ -2,6 +2,8 @@
 
 * Fix importing files relative to `package:`-imported files.
 
+* Don't claim that "package:" URLs aren't supported when they actually are.
+
 ### Dart API
 
 * Explicitly require that importers' `canonicalize()` methods be able to take

lib/src/visitor/async_evaluate.dart

@@ -27,6 +27,7 @@ import '../extend/extender.dart';
 import '../importer.dart';
 import '../importer/node.dart';
 import '../importer/utils.dart';
+import '../io.dart';
 import '../logger.dart';
 import '../parse/keyframe_selector.dart';
 import '../syntax.dart';
@@ -851,7 +852,7 @@ class _EvaluateVisitor
         if (tuple != null) return tuple;
       }
 
-      if (url.startsWith('package:')) {
+      if (url.startsWith('package:') && isNode) {
         // Special-case this error message, since it's tripped people up in the
         // past.
         throw "\"package:\" URLs aren't supported on this platform.";

lib/src/visitor/evaluate.dart

@@ -5,7 +5,7 @@
 // DO NOT EDIT. This file was generated from async_evaluate.dart.
 // See tool/synchronize.dart for details.
 //
-// Checksum: be2d44a3dc50defd98446d806b4c21bfe54a4ba9
+// Checksum: e7642c8d4c838f0afe94b882794e81b0937ba1a1
 //
 // ignore_for_file: unused_import
 
@@ -36,6 +36,7 @@ import '../extend/extender.dart';
 import '../importer.dart';
 import '../importer/node.dart';
 import '../importer/utils.dart';
+import '../io.dart';
 import '../logger.dart';
 import '../parse/keyframe_selector.dart';
 import '../syntax.dart';
@@ -851,7 +852,7 @@ class _EvaluateVisitor
         if (tuple != null) return tuple;
       }
 
-      if (url.startsWith('package:')) {
+      if (url.startsWith('package:') && isNode) {
         // Special-case this error message, since it's tripped people up in the
         // past.
         throw "\"package:\" URLs aren't supported on this platform.";

test/cli/dart/errors_test.dart

@@ -5,11 +5,29 @@
 @TestOn('vm')
 
 import 'package:test/test.dart';
+import 'package:test_descriptor/test_descriptor.dart' as d;
 
 import '../dart_test.dart';
 import '../shared/errors.dart';
 
 void main() {
   setUpAll(ensureSnapshotUpToDate);
   sharedTests(runSass);
+
+  test("for package urls", () async {
+    await d.file("test.scss", "@import 'package:nope/test';").create();
+
+    var sass = await runSass(["--no-unicode", "test.scss"]);
+    expect(
+        sass.stderr,
+        emitsInOrder([
+          "Error: Can't find stylesheet to import.",
+          "  ,",
+          "1 | @import 'package:nope/test';",
+          "  |         ^^^^^^^^^^^^^^^^^^^",
+          "  '",
+          "  test.scss 1:9  root stylesheet"
+        ]));
+    await sass.shouldExit(65);
+  });
 }

test/cli/node/errors_test.dart

@@ -6,6 +6,7 @@
 @Tags(['node'])
 
 import 'package:test/test.dart';
+import 'package:test_descriptor/test_descriptor.dart' as d;
 
 import '../../ensure_npm_package.dart';
 import '../node_test.dart';
@@ -14,4 +15,21 @@ import '../shared/errors.dart';
 void main() {
   setUpAll(ensureNpmPackage);
   sharedTests(runSass);
+
+  test("for package urls", () async {
+    await d.file("test.scss", "@import 'package:nope/test';").create();
+
+    var sass = await runSass(["--no-unicode", "test.scss"]);
+    expect(
+        sass.stderr,
+        emitsInOrder([
+          "Error: \"package:\" URLs aren't supported on this platform.",
+          "  ,",
+          "1 | @import 'package:nope/test';",
+          "  |         ^^^^^^^^^^^^^^^^^^^",
+          "  '",
+          "  test.scss 1:9  root stylesheet"
+        ]));
+    await sass.shouldExit(65);
+  });
 }

test/cli/shared/errors.dart

@@ -113,21 +113,4 @@ void sharedTests(Future<TestProcess> runSass(Iterable<String> arguments)) {
     expect(sass.stderr, emitsThrough(contains("\.dart")));
     await sass.shouldExit(65);
   });
-
-  test("for package urls", () async {
-    await d.file("test.scss", "@import 'package:nope/test';").create();
-
-    var sass = await runSass(["--no-unicode", "test.scss"]);
-    expect(
-        sass.stderr,
-        emitsInOrder([
-          "Error: \"package:\" URLs aren't supported on this platform.",
-          "  ,",
-          "1 | @import 'package:nope/test';",
-          "  |         ^^^^^^^^^^^^^^^^^^^",
-          "  '",
-          "  test.scss 1:9  root stylesheet"
-        ]));
-    await sass.shouldExit(65);
-  });
 }