@mdn/bob/editor/js/editor-libs/console.js

Builder of Bits aka The MDN Web Docs interactive examples, example builder

import { writeOutput, formatOutput } from "./console-utils.js";
// Thanks in part to https://stackoverflow.com/questions/11403107/capturing-javascript-console-log
export default function (targetWindow) {
    /* Getting reference to console, either from current window or from the iframe window */
    const console = targetWindow ? targetWindow.console : window.console;
    const originalConsoleLogger = console.log;
    const originalConsoleError = console.error;
    console.error = function (loggedItem, ...otherArgs) {
        writeOutput(loggedItem);
        // do not swallow console.error
        originalConsoleError.apply(console, [loggedItem, ...otherArgs]);
    };
    console.log = function (...args) {
        const formattedList = [];
        for (let i = 0, l = args.length; i < l; i++) {
            const formatted = formatOutput(args[i]);
            formattedList.push(formatted);
        }
        const output = formattedList.join(" ");
        writeOutput(output);
        // do not swallow console.log
        originalConsoleLogger.apply(console, args);
    };
}
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