Revert "fix(page): fallback to default in exposeFunction when using i…

…mported module (puppeteer#6365)"

This reverts commit 44c9ec6.

docs/api.md

@@ -1878,7 +1878,7 @@ await page.evaluateOnNewDocument(preloadFile);
 #### page.exposeFunction(name, puppeteerFunction)
 
 - `name` <[string]> Name of the function on the window object
-- `puppeteerFunction` <[function]> Callback function which will be called in Puppeteer's context. Can also be a module with a default export.
+- `puppeteerFunction` <[function]> Callback function which will be called in Puppeteer's context.
 - returns: <[Promise]>
 
 The method adds a function called `name` on the page's `window` object.

src/common/Page.ts

@@ -1387,25 +1387,13 @@ export class Page extends EventEmitter {
    */
   async exposeFunction(
     name: string,
-    puppeteerFunction: Function | { default: Function }
+    puppeteerFunction: Function
   ): Promise<void> {
     if (this._pageBindings.has(name))
       throw new Error(
         `Failed to add page binding with name ${name}: window['${name}'] already exists!`
       );
-
-    let exposedFunction: Function;
-    if (typeof puppeteerFunction === 'function') {
-      exposedFunction = puppeteerFunction;
-    } else if (typeof puppeteerFunction.default === 'function') {
-      exposedFunction = puppeteerFunction.default;
-    } else {
-      throw new Error(
-        `Failed to add page binding with name ${name}: ${puppeteerFunction} is not a function or a module with a default export.`
-      );
-    }
-
-    this._pageBindings.set(name, exposedFunction);
+    this._pageBindings.set(name, puppeteerFunction);
 
     const expression = helper.pageBindingInitString('exposedFun', name);
     await this._client.send('Runtime.addBinding', { name: name });

test/page.spec.ts

@@ -1046,20 +1046,6 @@ describe('Page', function () {
       );
       expect(result.x).toBe(7);
     });
-    it('should fallback to default export when passed a module object', async () => {
-      const { page, server } = getTestState();
-      const moduleObject = {
-        default: function (a, b) {
-          return a * b;
-        },
-      };
-      await page.goto(server.EMPTY_PAGE);
-      await page.exposeFunction('compute', moduleObject);
-      const result = await page.evaluate(async function () {
-        return await globalThis.compute(9, 4);
-      });
-      expect(result).toBe(36);
-    });
   });
 
   describeFailsFirefox('Page.Events.PageError', function () {