diff --git a/web_sdk/libraries.json b/web_sdk/libraries.json
index a2a7b847b28..716615be5af 100644
--- a/web_sdk/libraries.json
+++ b/web_sdk/libraries.json
@@ -28,9 +28,6 @@
       "_js_helper": {
         "uri": "../dart-sdk/lib/_internal/js_dev_runtime/private/js_helper.dart"
       },
-      "_js_mirrors": {
-        "uri": "../dart-sdk/lib/_internal/js_dev_runtime/private/js_mirrors.dart"
-      },
       "_js_primitives": {
         "uri": "../dart-sdk/lib/_internal/js_dev_runtime/private/js_primitives.dart"
       },
@@ -70,11 +67,6 @@
         "patches": "../dart-sdk/lib/_internal/js_dev_runtime/patch/isolate_patch.dart",
         "supported": false
       },
-      "mirrors": {
-        "uri": "../dart-sdk/lib/mirrors/mirrors.dart",
-        "patches": "../dart-sdk/lib/_internal/js_dev_runtime/patch/mirrors_patch.dart",
-        "supported": false
-      },
       "math": {
         "uri": "../dart-sdk/lib/math/math.dart",
         "patches": "../dart-sdk/lib/_internal/js_dev_runtime/patch/math_patch.dart"
@@ -184,11 +176,6 @@
         "uri": "../dart-sdk/lib/math/math.dart",
         "patches": "../dart-sdk/lib/_internal/js_runtime/lib/math_patch.dart"
       },
-      "mirrors": {
-        "uri": "../dart-sdk/lib/mirrors/mirrors.dart",
-        "patches": "../dart-sdk/lib/_internal/js_runtime/lib/mirrors_patch_cfe.dart",
-        "supported": false
-      },
       "typed_data": {
         "uri": "../dart-sdk/lib/typed_data/typed_data.dart",
         "patches": "../dart-sdk/lib/_internal/js_runtime/lib/typed_data_patch.dart"
diff --git a/web_sdk/libraries.yaml b/web_sdk/libraries.yaml
index 48ebeb23ab9..6653da50f92 100644
--- a/web_sdk/libraries.yaml
+++ b/web_sdk/libraries.yaml
@@ -40,9 +40,6 @@ dartdevc:
     _js_helper:
       uri: "../dart-sdk/lib/_internal/js_dev_runtime/private/js_helper.dart"
 
-    _js_mirrors:
-      uri: "../dart-sdk/lib/_internal/js_dev_runtime/private/js_mirrors.dart"
-
     _js_primitives:
       uri: "../dart-sdk/lib/_internal/js_dev_runtime/private/js_primitives.dart"
 
@@ -82,11 +79,6 @@ dartdevc:
       patches: "../dart-sdk/lib/_internal/js_dev_runtime/patch/isolate_patch.dart"
       supported: false
 
-    mirrors:
-      uri: "../dart-sdk/lib/mirrors/mirrors.dart"
-      patches: "../dart-sdk/lib/_internal/js_dev_runtime/patch/mirrors_patch.dart"
-      supported: false
-
     math:
       uri: "../dart-sdk/lib/math/math.dart"
       patches: "../dart-sdk/lib/_internal/js_dev_runtime/patch/math_patch.dart"
@@ -194,11 +186,6 @@ dart2js:
       uri: "../dart-sdk/lib/math/math.dart"
       patches: "../dart-sdk/lib/_internal/js_runtime/lib/math_patch.dart"
 
-    mirrors:
-      uri: "../dart-sdk/lib/mirrors/mirrors.dart"
-      patches: "../dart-sdk/lib/_internal/js_runtime/lib/mirrors_patch_cfe.dart"
-      supported: false
-
     typed_data:
       uri: "../dart-sdk/lib/typed_data/typed_data.dart"
       patches: "../dart-sdk/lib/_internal/js_runtime/lib/typed_data_patch.dart"