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html.tsx
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html.tsx
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/** @jsx h */
import { h, JSXNode } from "./jsx.ts";
const sharedPlugins: Plugin[] = [];
export interface HtmlOptions {
lang?: string;
classes?: {
html?: string[];
body?: string[];
};
title?: string;
meta?: Record<string, 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<HtmlOptions, "plugins"> {
body: string;
status: number;
headers: Headers;
}
export interface Plugin {
(props: PluginContext): void | Promise<void>;
}
export interface Options extends HtmlOptions {
body: JSXNode | string;
status?: number;
headers?: HeadersInit;
}
export default async function html(
input: JSXNode | string | Options,
): Promise<Response> {
const { body, status = 200, headers: headersInit, plugins, ...rest } =
input instanceof JSXNode || typeof input === "string"
? { body: input } as Options
: input;
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,
body: bodyHtml,
status,
headers,
};
for (const plugin of sharedPlugins) {
await plugin(context);
}
if (plugins) {
for (const plugin of plugins) {
await plugin(context);
}
}
const root = <Html {...context} />;
return new Response(
`<!DOCTYPE html>` + root.toString(),
{
status: context.status,
headers: context.headers,
},
);
}
interface HtmlProps extends HtmlOptions {
body: string;
}
function Html({
lang,
classes,
title,
meta,
links,
styles,
scripts,
body,
}: HtmlProps) {
return (
<html
lang={lang ?? "en"}
class={classes?.html?.join(" ") || undefined}
>
<head>
<meta charSet="utf-8" />
<meta name="viewport" content="width=device-width, initial-scale=1" />
{title && <title>{title}</title>}
{meta &&
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 &&
links.filter(boolFilter).map(({ rel, href, ...rest }) => (
<link rel={rel} href={href} {...rest} />
))}
{styles && 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 && 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?.join(" ") || undefined}
dangerouslySetInnerHTML={{ __html: body }}
/>
</html>
);
}
function boolFilter<T>(value: T | boolean): value is T {
return Boolean(value);
}
html.use = (...plugin: Plugin[]) => {
sharedPlugins.push(...plugin);
};