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html.tsx
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html.tsx
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/** @jsx h */
import { h, JSXNode } from "./jsx.ts";
export interface HtmlOptions {
lang?: string;
classes?: { html?: (string | boolean)[]; body?: (string | boolean)[] };
title?: string;
meta?: Record<string, boolean | string | null | undefined>;
links?: (boolean | { [key: string]: string; href: string; rel: string })[];
styles?: (boolean | string | { href?: string; text?: string; id?: string })[];
scripts?: (boolean | string | {
src?: string;
text?: string;
type?: string;
id?: string;
async?: boolean;
defer?: boolean;
})[];
plugins?: Plugin[];
}
export interface PluginContext
extends
Omit<Required<HtmlOptions>, "plugins" | "classes" | "lang" | "title"> {
lang?: string;
title?: string;
classes: { html: (string | boolean)[]; body: (string | boolean)[] };
body: string;
status: number;
headers: Headers;
}
export interface Plugin {
(props: PluginContext): void | Promise<void>;
}
export interface RenderOptions extends HtmlOptions {
body: JSXNode | string;
status?: number;
headers?: HeadersInit;
}
export default async function html(
input: JSXNode | string | RenderOptions,
): Promise<Response> {
const {
classes = {},
meta = {},
links = [],
styles = [],
scripts = [],
body,
status = 200,
headers: headersInit,
plugins,
...rest
} = input instanceof JSXNode || typeof input === "string"
? { body: input } as RenderOptions
: input;
const { html: htmlClasses = [], body: bodyClasses = [] } = classes;
const bodyHtml = typeof body === "string" ? body : body.toString();
const headers = new Headers(headersInit);
headers.append("Content-Type", "text/html; charset=utf-8");
const context: PluginContext = {
...rest,
classes: {
html: htmlClasses,
body: bodyClasses,
},
meta,
links,
styles,
scripts,
body: bodyHtml,
status,
headers,
};
for (const plugin of html.plugins) {
await plugin(context);
}
if (plugins) {
for (const plugin of plugins) {
if (!html.plugins.includes(plugin)) {
await plugin(context);
}
}
}
const root = <Html {...context} />;
return new Response(
`<!DOCTYPE html>` + root.toString(),
{
status: context.status,
headers: context.headers,
},
);
}
export type HtmlProps = Omit<PluginContext, "status" | "headers">;
export function Html(props: HtmlProps): JSX.Element {
const {
lang,
title,
classes,
meta,
links,
styles,
scripts,
body,
} = props;
return (
<html
lang={lang ?? "en"}
class={classes.html.filter(Boolean).join(" ") || undefined}
>
<head>
<meta charSet="utf-8" />
{title && <title>{title}</title>}
{Object.entries(meta).filter(([name, content]) => !!name && !!content)
.map(([name, content]) => (
name.startsWith("og:")
? <meta property={name} content={String(content)} />
: <meta name={name} content={String(content)} />
))}
{links.filter(boolFilter).map(({ rel, href, ...rest }) => (
<link rel={rel} href={href} {...rest} />
))}
{styles.filter(boolFilter).map((style) => (
typeof style === "string"
? <style dangerouslySetInnerHTML={{ __html: style }} />
: (
<link
id={style.id}
rel="stylesheet"
href={style.href}
dangerouslySetInnerHTML={style.text
? { __html: style.text }
: undefined}
/>
)
))}
{scripts.filter(boolFilter).map((script) => (
typeof script === "string"
? <script dangerouslySetInnerHTML={{ __html: script }} />
: (
<script
id={script.id}
type={script.type}
src={script.src}
async={script.async}
defer={script.defer}
dangerouslySetInnerHTML={script.text
? { __html: script.text }
: undefined}
/>
)
))}
</head>
<body
class={classes.body.filter(Boolean).join(" ") || undefined}
dangerouslySetInnerHTML={{ __html: body }}
/>
</html>
);
}
function boolFilter<T>(value: T | boolean): value is T {
return Boolean(value);
}
html.plugins = [] as Plugin[];
html.use = (...plugin: Plugin[]) => {
html.plugins.push(...plugin);
};