Error handling about babel-plugin-dynamic-import-webpack

[kesne]

I'm not sure how to do this without patching webpack itself. Webpack2 added error handling to require.ensure, but it was never added to the 1.x branch.

[chicoxyzzy]

And Webpack 1 will never get error handling for require.ensure

[ljharb]

What currently happens in webpack 1 when the module fails to load via require.ensure?

[just-boris]

Nothing happens. Successful callback is never called.

There was ticket in webpack, closed with the commit into 2.0 branch: webpack/webpack#758

Also, there is a plugin, that does some monkey patching of Webpack1 internals to get this: https://github.com/richardscarrott/require-error-handler-webpack-plugin

Finally, it is also possible to add a timeout, like it was done in Require.js:

new Promise((resolve, reject) => {
  require.ensure([], require => {
    resolve(require('test-module'));
  });
  setTimeout(() => reject(new Error('module loading was timed out')), timeoutInterval);
});

[jharris4]

FYI, I just submitted a PR to Webpack v2.2 to add require.ensure error handling: webpack/webpack#4069

[just-boris]

With Webpack2 it is not a problem. There is already native support of import() expression.

[jharris4]

import() does add error handling, but doesn't support named chunks, or recursive code splitting, see my comment here:

webpack/webpack#3364 (comment)

[ljharb]

Neither of those things are part of the import() spec so they're irrelevant here.