Ensure all deprecated symbols are annotated

src/deprecated.ts

@@ -14,9 +14,45 @@
  * limitations under the License.
  */
 
-export {onCLS as getCLS} from './onCLS.js';
-export {onFCP as getFCP} from './onFCP.js';
-export {onFID as getFID} from './onFID.js';
-export {onINP as getINP} from './onINP.js';
-export {onLCP as getLCP} from './onLCP.js';
-export {onTTFB as getTTFB} from './onTTFB.js';
+import {onCLS} from './onCLS.js';
+import {onFCP} from './onFCP.js';
+import {onFID} from './onFID.js';
+import {onINP} from './onINP.js';
+import {onLCP} from './onLCP.js';
+import {onTTFB} from './onTTFB.js';
+import {ReportCallback} from './types.js';
+
+/**
+ * @deprecated Use `onCLS()` instead.
+ */
+export const getCLS = onCLS;
+
+/**
+ * @deprecated Use `onFCP()` instead.
+ */
+export const getFCP = onFCP;
+
+/**
+ * @deprecated Use `onFID()` instead.
+ */
+export const getFID = onFID;
+
+/**
+ * @deprecated Use `onINP()` instead.
+ */
+export const getINP = onINP;
+
+/**
+ * @deprecated Use `onLCP()` instead.
+ */
+export const getLCP = onLCP;
+
+/**
+ * @deprecated Use `onTTFB()` instead.
+ */
+export const getTTFB = onTTFB;
+
+/**
+ * @deprecated Use `ReportCallback` instead.
+ */
+export type ReportHandler = ReportCallback;