@baleada/rollup-plugin-source-transform/lib/index.js

Rollup plugin that allows you to transform files' content during your build step.

import pluginUtils from '@rollup/pluginutils';

const { createFilter } = pluginUtils;
const defaultOptions = {
    transform: ({ source }) => source,
};
function sourceTransform(options = {}) {
    const { transform, include, exclude, test: rawTest } = { ...defaultOptions, ...options }, test = ensureTest({ include, exclude, rawTest });
    return {
        name: 'source-transform',
        async transform(source, id) {
            if (!test({ source, id })) {
                return null;
            }
            return await transform({
                source,
                id,
                context: this,
                utils: pluginUtils
            });
        }
    };
}
function ensureTest({ include, exclude, rawTest }) {
    if (typeof rawTest === 'function') {
        return rawTest;
    }
    const filter = createFilter(include, exclude);
    return ({ id }) => filter(id);
}

export { sourceTransform };