svelte/test/sourcemaps/samples/preprocessed-multiple/_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");

        const css_idx = content.indexOf("--bazitone");
        src.overwrite(css_idx, css_idx + "--bazitone".length, "--baz");
        return {
            code: src.toString(),
            map: src.generateMap({
                source: filename,
                hires: true,
                includeContent: false
            })
        };
    }
},
{
    script: ({ content, filename }) => {
        const src = new MagicString(content);
        const idx = content.indexOf("bar");
        src.prependLeft(idx, "      ");
        return {
            code: src.toString(),
            map: src.generateMap({
                source: filename,
                hires: true,
                includeContent: false
            })
        };
    }
},
{
    style: ({ content, filename }) => {
        const src = new MagicString(content);
        const idx = content.indexOf("--baz");
        src.prependLeft(idx, "      ");
        return {
            code: src.toString(),
            map: src.generateMap({
                source: filename,
                hires: true,
                includeContent: false
            })
        };
    }
}
];