Extract-loader

[Arabella Kochanski]

Im starting my learning path with webpack and I've hit a problem, which I think is caused by extract-loader. When webpack grabs my HTML file, it seems to be unable to properly compile, giving an error on the use of import.meta. I think the error, rather than being a true error, indicates a problem with my understanding of how webpack and its loaders work. Can someone give a look at my files and see if they spot a mistake?

The extract-loader evaluates the given source code on the fly and returns the result as string. Its main use-case is to resolve urls within HTML and CSS coming from their respective loaders. Use the file-loader to emit the extract-loader's result as separate file.

The extract-loader works similar to the extract-text-webpack-plugin and the mini-css-extract-plugin and is meant as a lean alternative to it. When evaluating the source code, it provides a fake context which was especially designed to cope with the code generated by the html- or the css-loader. Thus it might not work in other situations.

Bundling CSS with webpack has some nice advantages like referencing images and fonts with hashed urls or hot module replacement in development. In production, on the other hand, it's not a good idea to apply your stylesheets depending on JS execution. Rendering may be delayed or even a FOUC might be visible. Thus it's still better to have them as separate files in your final production build.

With the extract-loader, you are able to reference your main.css as regular entry. The following webpack.config.js shows how to load your styles with the style-loader in development and as separate file in production.

There is currently exactly one option: publicPath.If you are using a relative publicPath in webpack's output options and extracting to a file with the file-loader, you might need this to account for the location of your extracted file. publicPath may be defined as a string or a function that accepts current loader context as single argument.

From opening a bug report to creating a pull request: every contribution is appreciated and welcome. If you're planning to implement a new feature or change the api please create an issue first. This way we can ensure that your precious work is not in vain.

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