diff --git a/src/charlotte.ts b/src/charlotte.ts
index 1d2d791..0aefd7a 100644
--- a/src/charlotte.ts
+++ b/src/charlotte.ts
@@ -1,5 +1,5 @@
 export { version } from '../package.json';
-export { inject } from './injector/inject';
+export { injectVM, injectBlockly } from './injector/inject';
 export { settings } from './util/settings';
 import openFrontend from './frontend';
 export {
diff --git a/src/global.d.ts b/src/global.d.ts
index b9853fd..cf330c2 100644
--- a/src/global.d.ts
+++ b/src/global.d.ts
@@ -1,6 +1,7 @@
 /* eslint-disable multiline-comment-style */
 /* eslint-disable @typescript-eslint/triple-slash-reference */
 /// <reference path="node_modules/@turbowarp/types/index.d.ts" />
+/// <reference path="node_modules/format-message/types.d.ts" />
 /// <reference path="./loader/loader" />
 /// <reference path="./loader/make-ctx" />
 /// <reference path="./util/settings" />
@@ -20,6 +21,7 @@ declare interface Window {
                 env: string;
             }
         >;
+        format?: formatMessage;
         openFrontend(): void;
     };
     Scratch?: Context;
diff --git a/src/index.ts b/src/index.ts
index 58ceb27..345fe91 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -1,14 +1,15 @@
-import { trap, inject } from './injector/inject';
+import { trap, injectVM, injectBlockly } from './injector/inject';
 import { log } from './util/log';
 const open = window.open;
 // @ts-expect-error defined in webpack define plugin
 log(`eureka-loader ${__EUREKA_VERSION__}`);
 // Try injecting chibi into the page.
 const [vm, blockly] = await trap(open);
-if (!!vm) {
+if (vm) {
     // Alright we got the virtual machine, start the injection.
     window.eureka.vm = vm;
-    inject(vm, blockly);
+    injectVM(vm);
+    injectBlockly(blockly);
 } else {
     // This is not a Scratch page, stop injecting.
     log(`Cannot find vm in this page, stop injecting.`);
diff --git a/src/injector/inject.ts b/src/injector/inject.ts
index 470ad68..93a3340 100644
--- a/src/injector/inject.ts
+++ b/src/injector/inject.ts
@@ -169,14 +169,7 @@ export function trap (open: typeof window.open): Promise<[EurekaCompatibleVM | n
         return [null, null];
     });
 }
-
-/**
- * Inject into the original virtual machine.
- * @param vm {EurekaCompatibleVM} Original virtual machine instance.
- */
-export function inject (vm: EurekaCompatibleVM, blockly: any) {
-    const loader = (window.eureka.loader = new EurekaLoader(vm));
-    const originalLoadFunc = vm.extensionManager.loadExtensionURL;
+function setupFormat (vm: EurekaCompatibleVM) {
     const getLocale = vm.getLocale;
     const format = formatMessage.namespace();
     format.setup({
@@ -185,6 +178,18 @@ export function inject (vm: EurekaCompatibleVM, blockly: any) {
         generateId: (defaultMessage: string) => `${defaultMessage}`,
         translations: l10n
     });
+    window.eureka.format = format;
+    return format;
+}
+
+/**
+ * Inject into the original virtual machine.
+ * @param vm {EurekaCompatibleVM} Original virtual machine instance.
+ */
+export function injectVM (vm: EurekaCompatibleVM) {
+    const loader = (window.eureka.loader = new EurekaLoader(vm));
+    const originalLoadFunc = vm.extensionManager.loadExtensionURL;
+    const format = setupFormat(vm);
     vm.extensionManager.loadExtensionURL = async function (extensionURL: string, ...args: []) {
         if (extensionURL in window.eureka.registeredExtension) {
             const { url, env } = window.eureka.registeredExtension[extensionURL];
@@ -453,7 +458,13 @@ export function inject (vm: EurekaCompatibleVM, blockly: any) {
             return originalGetOrderFunc.call(this, extensions, ...args);
         };
     }
+}
 
+export function injectBlockly (blockly: any) {
+    const format = window.eureka.format;
+    if (!format) {
+        return error('You should inject VM first');
+    }
     if (typeof blockly === 'object') {
         window.eureka.blockly = blockly;
         const originalAddCreateButton_ = blockly.Procedures.addCreateButton_;
@@ -472,7 +483,7 @@ export function inject (vm: EurekaCompatibleVM, blockly: any) {
         warn('Cannot find real blockly instance, try alternative method...');
         const originalProcedureCallback =
                 window.Blockly?.getMainWorkspace()?.toolboxCategoryCallbacks_?.PROCEDURE;
-        if (!originalProcedureCallback) {
+        if (typeof originalProcedureCallback !== 'function') {
             error('alternative method failed, stop injecting');
             return;
         }
@@ -493,6 +504,7 @@ export function inject (vm: EurekaCompatibleVM, blockly: any) {
         workspace.toolboxRefreshEnabled_ = true;
     }
 }
+
 function injectToolbox (
     xmlList: HTMLElement[],
     workspace: EurekaCompatibleWorkspace,