fakebrowser/dist/plugins/evasions/_utils/withUtils.js

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const utils = require('./index');

/**
 * Wrap a page with utilities.
 *
 * @param {PuppeteerExtraPlugin} plugin
 * @param {Page} page
 */
module.exports = (plugin, page) => ({
    /**
     * Simple `page.evaluate` replacement to preload utils
     */
    evaluate: async function (mainFunction, ...args) {
        return page.evaluate(
            ({_utilsFns, _mainFunction, _args}) => {
                // Add this point we cannot use our utililty functions as they're just strings, we need to materialize them first
                const utils = Object.fromEntries(
                    Object.entries(_utilsFns).map(([key, value]) => [key, eval(value)]), // eslint-disable-line no-eval
                );

                utils.init();
                return eval(_mainFunction)(utils, ..._args); // eslint-disable-line no-eval
            },
            {
                _utilsFns: utils.stringifyFns(utils),
                _mainFunction: mainFunction.toString(),
                _args: args || [],
            },
        );
    },
    /**
     * Simple `page.evaluateOnNewDocument` replacement to preload utils
     */
    evaluateOnNewDocument: async function (mainFunction, ...args) {
        return page.evaluateOnNewDocument(
            ({
                 _utilsFns,
                 _mainFunction,
                 _args,
                 _pluginName,
             }) => {
                // Add this point we cannot use our utililty functions as they're just strings, we need to materialize them first
                const utils = Object.fromEntries(
                    Object.entries(_utilsFns).map(
                        ([key, value]) => [key, eval(value)],
                    ), // eslint-disable-line no-eval
                );

                utils.init();
                return eval(_mainFunction)(utils, ..._args); // eslint-disable-line no-eval
            },
            {
                _utilsFns: utils.stringifyFns(utils),
                _mainFunction: mainFunction.toString(),
                _args: args || [],
                _pluginName: plugin.name,
            },
        );
    },
});