autoProvideVariables(variables) {
        webpackConfig.autoProvideVariables(variables);

        return this;
    }
Automatically make some variables available everywhere!

Usage:

```
WebpackConfig.autoProvideVariables({
    $: 'jquery',
    jQuery: 'jquery'
});
```

 Then, whenever $ or jQuery are found in any
 modules, webpack will automatically require
 the "jquery" module so that the variable is available.

 This is useful for older packages, that might
 expect jQuery (or something else) to be a global variable.

@param {Record<string, string|string[]>} variables
@returns {Encore}