Vite+vue3 project error: TypeError:  is not a function

I encountered "TypeError: is not a function" error in Vite+Vue3 project, which usually means your code is trying to callmethod, but the currently running JavaScript environment does not support this method.is a new feature introduced in ECMAScript 2020 (ES11), which returns a promise parsed after all given promises have been fulfilled or rejected, and each element in the resulting array describes how the corresponding promise ends (fulfilled or rejected, and the corresponding value or reason).

To solve this problem, you can take the following methods:

1. Upgrade your JavaScript environment

Make sure your browser or version supports it. For browsers, this usually means you need to use a newer version. for,Available in v12.9.0 and above. If your environment is older, consider upgrading to a newer version.

2. Use Polyfill

If your project needs to be supportedRun in the environment, you can use polyfill to add support for this method.core-jsis a popular polyfill library that provides support for many new ECMAScript features.

First, installcore-js：

npm install core-js

Then, in your project entry file (e.g.or) introduced in )polyfill:

import 'core-js/features/promise/all-settled';

Now, your project should be able to not support itThis method is used in the environment.

3. Rewrite the code

If upgrading the environment or using polyfill is not feasible, you may need to rewrite the code to avoid using. You can useCombined.then()and.catch()to handle the results and errors of each promise. However, please note that this method will not provide the followingExactly the same semantics, because it will immediately reject the entire one when it encounters the first rejected promiseCalled.

If you need to wait for all promises to complete (whether successful or failed) and get the results or errors for each promise, you can manually create a similar toBehavior:

function allSettled(promises) {
  return ((promise =>
    promise
      .then(value => ({ status: 'fulfilled', value }))
      .catch(reason => ({ status: 'rejected', reason }))
  ));
}

// Use exampleallSettled([promise1, promise2, promise3]).then(results => {
  // results is an array, each element is an object, describing how the corresponding promise ends  (result => {
    if ( === 'fulfilled') {
      ('Fulfilled with:', );
    } else if ( === 'rejected') {
      ('Rejected with:', );
    }
  });
});

4. Check the build configuration

Make sure your build tools (such as Vite) are not translating your code into an incompatible version. In Vite, you can passIn the fileOptions to specify the build target. However, note that simply setting the build target to a newer ECMAScript version is not always sufficient, as the final code may need to run in an environment that does not support these new features. Therefore, using polyfill is usually a more reliable option.

To sum up, which method to choose depends on your specific needs and the target environment of your project. When possible, using polyfill or upgrading an environment is the most direct and effective solution.

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