diff --git a/pkg/front_end/lib/src/fasta/source/source_library_builder.dart b/pkg/front_end/lib/src/fasta/source/source_library_builder.dart
index 825e1c2d902..f6866239eb1 100644
--- a/pkg/front_end/lib/src/fasta/source/source_library_builder.dart
+++ b/pkg/front_end/lib/src/fasta/source/source_library_builder.dart
@@ -202,6 +202,18 @@ abstract class SourceLibraryBuilder<T extends TypeBuilder, R>
     exports.add(new Export(this, exportedLibrary, combinators, charOffset));
   }
 
+  String _lookupImportCondition(String dottedName) {
+    const String prefix = "dart.library.";
+    if (!dottedName.startsWith(prefix)) return "";
+    dottedName = dottedName.substring(prefix.length);
+
+    LibraryBuilder coreLibrary =
+        loader.read(resolve(this.uri, "dart:core", -1), -1);
+    LibraryBuilder imported = coreLibrary
+        .loader.builders[new Uri(scheme: 'dart', path: dottedName)];
+    return imported != null ? "true" : "";
+  }
+
   void addImport(
       List<MetadataBuilder> metadata,
       String uri,
@@ -214,9 +226,7 @@ abstract class SourceLibraryBuilder<T extends TypeBuilder, R>
       int uriOffset) {
     if (configurations != null) {
       for (Configuration config in configurations) {
-        if (loader.target.backendTarget
-                .lookupImportCondition(config.dottedName) ==
-            config.condition) {
+        if (_lookupImportCondition(config.dottedName) == config.condition) {
           uri = config.importUri;
           break;
         }
diff --git a/pkg/kernel/lib/target/targets.dart b/pkg/kernel/lib/target/targets.dart
index a571982cca3..342757e2456 100644
--- a/pkg/kernel/lib/target/targets.dart
+++ b/pkg/kernel/lib/target/targets.dart
@@ -152,10 +152,6 @@ abstract class Target {
   /// extensions, but targets like dart2js only enable it on the core libraries.
   bool enableNative(Uri uri) => false;
 
-  /// Returns whether the given condition Uri should evaluate to true for the
-  /// purposes of resolving conditional imports.
-  String lookupImportCondition(String condition) => "";
-
   /// There are two variants of the `native` language extension. The VM expects
   /// the native token to be followed by string, whereas dart2js and DDC do not.
   // TODO(sigmund, ahe): ideally we should remove the `native` syntax, if not,
diff --git a/tests/language_2/language_2_dartdevc.status b/tests/language_2/language_2_dartdevc.status
index ab507cd5074..2e88f06b930 100644
--- a/tests/language_2/language_2_dartdevc.status
+++ b/tests/language_2/language_2_dartdevc.status
@@ -714,8 +714,8 @@ truncdiv_test: RuntimeError # Issue 29920
 
 [ $compiler == dartdevk && $runtime != none ]
 callable_test/none: RuntimeError # Expect.throws(TypeError) fails: Did not throw
-conditional_import_string_test: RuntimeError # Unsupported operation: String.fromEnvironment can only be used as a const constructor
-conditional_import_test: RuntimeError # Unsupported operation: bool.fromEnvironment can only be used as a const constructor
+conditional_import_string_test: CompileTimeError # Test is broken
+conditional_import_test: CompileTimeError # Test is broken
 cyclic_type_test/00: RuntimeError # Expect.equals(expected: <Derived>, actual: <dynamic>) fails.
 cyclic_type_test/01: RuntimeError # Expect.equals(at index 0: Expected <Derived<Derived<int>>...>, Found: <dynamic>) fails.
 enum_duplicate_test/01: RuntimeError # NoSuchMethodError: method not found: '<Unexpected Null Value>'