@worker-tools/middleware/esm/flushed.js

A suite of standalone HTTP server middlewares for Worker Runtimes.

export { pipe as combine } from 'ts-functional-pipe';
import { ResolvablePromise } from '@worker-tools/resolvable-promise';
class FlushCallbackStream extends TransformStream {
    constructor(flushCallback) {
        super({ flush() { flushCallback(); } });
    }
}
export const flushed = () => async (ax) => {
    const x = await ax;
    const flush = new ResolvablePromise();
    const flushed = Promise.resolve(flush);
    x.effects.push(res => {
        const ref = {};
        const cb = () => flush.resolve(ref.res);
        const { status, statusText, headers, body } = res;
        ref.res = new Response(body != null
            ? body.pipeThrough(new FlushCallbackStream(cb))
            : (x.handled.then(cb), null), { status, statusText, headers });
        return ref.res;
    });
    return Object.assign(x, { flushed });
};
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