.rs

                ErrorMime::JavaScript => format!(
                    "{pre}{json};\nlet css = {css_json};\n{code}\n{close}",
                    json = get_json(),
                    pre = "{ let error_json = ",
                    close = "}",
                    code = indoc::indoc!(r#"
                        const h = (tag, {style, ...props}, ...children) => {
                            const element = Object.assign(document.createElement(tag), props);
                            Object.assign(element.style, style);
                            for (const child of children) {
                                if (!child || child === true) continue;
                                if (child instanceof Node) {
                                    element.appendChild(child);
                                } else {
                                    const text = document.createTextNode(String(child));
                                    element.appendChild(text);
                                }
                            }

                            return element;
                        };

                        document.head.appendChild(
                            h('style', {}, css),
                        );
                        document.body.appendChild(
                            h('aside', {},
                                h('h1', { style: { color: 'var(--red)' } }, error_json.title),
                                h('h3', {},
                                    'Code: ',
                                    h('span', { style: { color: 'var(--purple)' } }, error_json.code),
                                ),
                                h('p', { style: { color: 'var(--yellow)', whiteSpace: 'pre-wrap' } }, error_json.message),
                            ),
                        );
                        "#),
                        css_json = serde_json::to_string(colors).unwrap(),
                    ),