@werker/html/html-response.js

HTML templating and streaming response library for worker environments such as Cloudflare Workers

import { asyncIterableToStream } from 'whatwg-stream-to-async-iter';
import { aMap, aJoin } from './iter';
export class HTMLResponse extends Response {
    constructor(html, init) {
        if (typeof TextEncoderStream !== 'undefined') {
            super(asyncIterableToStream(html).pipeThrough(new TextEncoderStream()), init);
        }
        else {
            // If `TextEncoderStream` is not available, we can use an asynchronous map 
            // to pass strings to a text encoder on demand.
            const encoder = new TextEncoder();
            const textEncoderGenerator = aMap((str) => encoder.encode(str));
            super(asyncIterableToStream(textEncoderGenerator(html)), init);
        }
        // Since this class is for HTML responses only, and `TextEncoder` only supports UTF-8, 
        // we can set this header reliably:
        this.headers.set('Content-Type', 'text/html;charset=UTF-8');
    }
}
/** @deprecated You can now use HTMLResponse in Cloudflare Workers */
export class CFWorkersHTMLResponse extends HTMLResponse {
}
/**
 * If for any reason you don't want to use streaming response bodies,
 * you can use this class instead, which will buffer the entire body before releasing it to the network.
 * Note that headers will still be sent immediately.
 */
export class BufferedHTMLResponse extends Response {
    constructor(html, init) {
        const bufferedHTML = aJoin(html);
        const textEncoderGenerator = aMap((str) => new TextEncoder().encode(str));
        super(asyncIterableToStream(textEncoderGenerator(bufferedHTML)), init);
        this.headers.set('Content-Type', 'text/html;charset=UTF-8');
    }
}
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