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Advanced loader utility functions.

Add `append`, `prepend`, `find`, `remove` and `update` to loader utilities which allow you to modify the loaders in an existing `webpack` configuration as well as control the order in which they are added.

```js
// Typical setup.
const x = loader({loader: 'my-loader'});
const config = x({});

// Can now modify.
const updateExclude = loader.update(
  ({loader}) => loader === 'my-loader',
  (loader) => ({
    ...loader,
    exclude: /bar/,
  }
));
const newConfig = updateExclude(config);
```

Also supports functions as loader generators which allow you to generate your loader based off the current `webpack` configuration.

```js
const x = loader((config) => {
  return {
    loader: 'foo-loader',
    query: {path: config.output.publicPath},
  };
});
```

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