angular
diff --git a/‎packages/angular_devkit/build_angular/src/builders/browser-esbuild/index.ts
Lines changed: 52 additions & 13 deletions b/‎packages/angular_devkit/build_angular/src/builders/browser-esbuild/index.ts
Lines changed: 52 additions & 13 deletions
@@ -253,19 +253,7 @@ function createCodeBundleOptions(
     entryNames: outputNames.bundles,
     assetNames: outputNames.media,
     target,
-    supported: {
-      // Native async/await is not supported with Zone.js. Disabling support here will cause
-      // esbuild to downlevel async/await and for await...of to a Zone.js supported form. However, esbuild
-      // does not currently support downleveling async generators. Instead babel is used within the JS/TS
-      // loader to perform the downlevel transformation.
-      // NOTE: If esbuild adds support in the future, the babel support for async generators can be disabled.
-      'async-await': false,
-      // V8 currently has a performance defect involving object spread operations that can cause signficant
-      // degradation in runtime performance. By not supporting the language feature here, a downlevel form
-      // will be used instead which provides a workaround for the performance issue.
-      // For more details: https://bugs.chromium.org/p/v8/issues/detail?id=11536
-      'object-rest-spread': false,
-    },
+    supported: getFeatureSupport(target),
     mainFields: ['es2020', 'browser', 'module', 'main'],
     conditions: ['es2020', 'es2015', 'module'],
     resolveExtensions: ['.ts', '.tsx', '.mjs', '.js'],
@@ -314,6 +302,57 @@ function createCodeBundleOptions(
   };
 }
 
+/**
+ * Generates a syntax feature object map for Angular applications based on a list of targets.
+ * A full set of feature names can be found here: https://esbuild.github.io/api/#supported
+ * @param target An array of browser/engine targets in the format accepted by the esbuild `target` option.
+ * @returns An object that can be used with the esbuild build `supported` option.
+ */
+function getFeatureSupport(target: string[]): BuildOptions['supported'] {
+  const supported: Record<string, boolean> = {
+    // Native async/await is not supported with Zone.js. Disabling support here will cause
+    // esbuild to downlevel async/await and for await...of to a Zone.js supported form. However, esbuild
+    // does not currently support downleveling async generators. Instead babel is used within the JS/TS
+    // loader to perform the downlevel transformation.
+    // NOTE: If esbuild adds support in the future, the babel support for async generators can be disabled.
+    'async-await': false,
+    // V8 currently has a performance defect involving object spread operations that can cause signficant
+    // degradation in runtime performance. By not supporting the language feature here, a downlevel form
+    // will be used instead which provides a workaround for the performance issue.
+    // For more details: https://bugs.chromium.org/p/v8/issues/detail?id=11536
+    'object-rest-spread': false,
+  };
+
+  // Detect Safari browser versions that have a class field behavior bug
+  // See: https://github.com/angular/angular-cli/issues/24355#issuecomment-1333477033
+  // See: https://github.com/WebKit/WebKit/commit/e8788a34b3d5f5b4edd7ff6450b80936bff396f2
+  let safariClassFieldScopeBug = false;
+  for (const browser of target) {
+    let majorVersion;
+    if (browser.startsWith('ios')) {
+      majorVersion = Number(browser.slice(3, 5));
+    } else if (browser.startsWith('safari')) {
+      majorVersion = Number(browser.slice(6, 8));
+    } else {
+      continue;
+    }
+    // Technically, 14.0 is not broken but rather does not have support. However, the behavior
+    // is identical since it would be set to false by esbuild if present as a target.
+    if (majorVersion === 14 || majorVersion === 15) {
+      safariClassFieldScopeBug = true;
+      break;
+    }
+  }
+  // If class field support cannot be used set to false; otherwise leave undefined to allow
+  // esbuild to use `target` to determine support.
+  if (safariClassFieldScopeBug) {
+    supported['class-field'] = false;
+    supported['class-static-field'] = false;
+  }
+
+  return supported;
+}
+
 function createGlobalStylesBundleOptions(
   options: NormalizedBrowserOptions,
   target: string[],