svelte/test/sourcemaps/samples/preprocessed-markup/_preprocessor.js

import MagicString from 'magic-string';

export const preprocessors = [{
    markup: ({content, filename}) =>  {
        const src = new MagicString(content);
        const idx = content.indexOf("baritone");
        src.overwrite(idx, idx+"baritone".length, "bar");
        return { 
            code: src.toString(),
            map: src.generateMap({
                source: filename,
                includeContent: false
            })
        };
    }
}];