Webpack4 can't use dynamic import?

according to the demo in ides/code-splitting/" rel=" nofollow noreferrer > webpack Guide . appears

it was fine when there was no webpack4.x version before. Now my previous version of webpack3.10.0, demo, has the same error. What"s the problem, please? It doesn"t make sense. My old demo didn"t work either.
Uh. Recently upgraded node to 8.9.3 using n? Is there a problem with the node version?

Feb.27,2021

try to install babel-plugin-dynamic-import-webpack and configure

in .babelrc .
    "plugins": [
            "dynamic-import-webpack"
        ],
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