diff --git a/packages/mountable/__mocks__/@stlite/common-react.ts b/packages/mountable/__mocks__/@stlite/common-react.ts
deleted file mode 100644
index 2b257824b..000000000
--- a/packages/mountable/__mocks__/@stlite/common-react.ts
+++ /dev/null
@@ -1,11 +0,0 @@
-const onError = jest.fn();
-const onLoad = jest.fn();
-const onProgress = jest.fn();
-
-export function makeToastKernelCallbacks() {
-  return {
-    onError,
-    onLoad,
-    onProgress,
-  };
-}
diff --git a/packages/mountable/package.json b/packages/mountable/package.json
index eeb7c9f84..11b8a9508 100644
--- a/packages/mountable/package.json
+++ b/packages/mountable/package.json
@@ -120,7 +120,6 @@
   },
   "jest": {
     "roots": [
-      "<rootDir>",
       "<rootDir>/src"
     ],
     "collectCoverageFrom": [
diff --git a/packages/mountable/src/index.tsx b/packages/mountable/src/index.tsx
index 09a07b56c..eeb0e080e 100644
--- a/packages/mountable/src/index.tsx
+++ b/packages/mountable/src/index.tsx
@@ -4,7 +4,11 @@ import StreamlitApp from "./StreamlitApp";
 import { StliteKernel } from "@stlite/kernel";
 import { getParentUrl } from "./url";
 import { canonicalizeMountOptions, MountOptions } from "./options";
-import { ToastContainer, StliteKernelWithToast } from "@stlite/common-react";
+import {
+  ToastContainer,
+  makeToastKernelCallbacks,
+  StliteKernelWithToast,
+} from "@stlite/common-react";
 import "react-toastify/dist/ReactToastify.css";
 import "@stlite/common-react/src/toastify-components/toastify.css";
 
@@ -34,6 +38,7 @@ export function mount(
   const kernel = new StliteKernel({
     ...canonicalizeMountOptions(options),
     wheelBaseUrl,
+    ...makeToastKernelCallbacks(),
   });
 
   ReactDOM.render(
diff --git a/packages/mountable/src/options.test.ts b/packages/mountable/src/options.test.ts
index fb4f48615..3b2816ce6 100644
--- a/packages/mountable/src/options.test.ts
+++ b/packages/mountable/src/options.test.ts
@@ -1,4 +1,3 @@
-import { makeToastKernelCallbacks } from "@stlite/common-react";
 import { canonicalizeMountOptions, resolveUrl } from "./options";
 
 describe("resolveUrl()", () => {
@@ -64,7 +63,6 @@ describe("canonicalizeMountOptions()", () => {
       },
       requirements: [],
       archives: [],
-      ...makeToastKernelCallbacks(),
     });
   });
 
@@ -96,7 +94,6 @@ describe("canonicalizeMountOptions()", () => {
         },
       },
       archives: [],
-      ...makeToastKernelCallbacks(),
     });
   });
 
@@ -142,7 +139,6 @@ describe("canonicalizeMountOptions()", () => {
           options: {},
         },
       ],
-      ...makeToastKernelCallbacks(),
     });
   });
 
@@ -163,7 +159,6 @@ describe("canonicalizeMountOptions()", () => {
         },
       },
       archives: [],
-      ...makeToastKernelCallbacks(),
     });
   });
 
@@ -177,31 +172,6 @@ describe("canonicalizeMountOptions()", () => {
       entrypoint: "streamlit_app.py",
       files: {},
       archives: [],
-      ...makeToastKernelCallbacks(),
     });
   });
-
-  it("wraps the `onError` option and also delegates to the original toast callback if `true` returned", () => {
-    const toastCallbacks = makeToastKernelCallbacks();
-
-    const onError = jest.fn();
-    const options = canonicalizeMountOptions({ onError });
-
-    const error = new Error("foo");
-    options.onError!(error);
-    expect(onError).toHaveBeenCalledWith(error);
-    expect(toastCallbacks.onError).toHaveBeenCalledWith(error);
-  });
-
-  it("wraps the `onError` option but prevents the toast if `false` returned", () => {
-    const toastCallbacks = makeToastKernelCallbacks();
-
-    const onError = jest.fn(() => false);
-    const options = canonicalizeMountOptions({ onError });
-
-    const error = new Error("foo");
-    options.onError!(error);
-    expect(onError).toHaveBeenCalledWith(error);
-    expect(toastCallbacks.onError).not.toHaveBeenCalled();
-  });
 });
diff --git a/packages/mountable/src/options.ts b/packages/mountable/src/options.ts
index 33851e10e..16c337ac0 100644
--- a/packages/mountable/src/options.ts
+++ b/packages/mountable/src/options.ts
@@ -3,7 +3,6 @@ import type {
   EmscriptenFile,
   EmscriptenFileUrl,
 } from "@stlite/kernel";
-import { makeToastKernelCallbacks } from "@stlite/common-react";
 
 export interface SimplifiedStliteKernelOptions {
   entrypoint?: string;
@@ -16,10 +15,6 @@ export interface SimplifiedStliteKernelOptions {
   allowedOriginsResp?: StliteKernelOptions["allowedOriginsResp"];
   pyodideUrl?: StliteKernelOptions["pyodideUrl"];
   streamlitConfig?: StliteKernelOptions["streamlitConfig"];
-  // We won't add onProgress and onLoad callbacks until they are required by some users to keep the API simple.
-  onError?: (
-    ...args: Parameters<NonNullable<StliteKernelOptions["onError"]>>
-  ) => boolean | void;
 }
 
 function canonicalizeFiles(
@@ -86,8 +81,6 @@ export type MountOptions = string | SimplifiedStliteKernelOptions;
 export function canonicalizeMountOptions(
   options: string | SimplifiedStliteKernelOptions
 ): StliteKernelOptions {
-  const toastCallbacks = makeToastKernelCallbacks();
-
   if (typeof options === "string") {
     const mainScript = options;
     return {
@@ -99,23 +92,12 @@ export function canonicalizeMountOptions(
       },
       archives: [],
       requirements: [],
-      ...toastCallbacks,
     };
   }
 
   const files = canonicalizeFiles(options.files);
   const archives = canonicalizeArchives(options.archives);
 
-  const onErrorOption = options.onError;
-  const onError: StliteKernelOptions["onError"] = onErrorOption
-    ? (...args) => {
-        const shouldShowToast = onErrorOption(...args);
-        if (shouldShowToast !== false) {
-          toastCallbacks.onError(...args);
-        }
-      }
-    : toastCallbacks.onError;
-
   return {
     entrypoint: options.entrypoint || DEFAULT_ENTRYPOINT,
     files,
@@ -124,7 +106,5 @@ export function canonicalizeMountOptions(
     allowedOriginsResp: options.allowedOriginsResp,
     pyodideUrl: options.pyodideUrl,
     streamlitConfig: options.streamlitConfig,
-    ...toastCallbacks,
-    onError,
   };
 }