@push.rocks/smartstream/dist_ts_web/convert.js

A library to simplify the creation and manipulation of Node.js streams, providing utilities for handling transform, duplex, and readable/writable streams effectively in TypeScript.

export function convertDuplexToWebStream(duplex) {
    const readable = new ReadableStream({
        start(controller) {
            duplex.on('readable', () => {
                let chunk;
                while (null !== (chunk = duplex.read())) {
                    controller.enqueue(chunk);
                }
            });
            duplex.on('end', () => {
                controller.close();
            });
        },
        cancel(reason) {
            duplex.destroy(new Error(reason));
        }
    });
    const writable = new WritableStream({
        write(chunk) {
            return new Promise((resolve, reject) => {
                const isBackpressured = !duplex.write(chunk, (error) => {
                    if (error) {
                        reject(error);
                    }
                    else {
                        resolve();
                    }
                });
                if (isBackpressured) {
                    duplex.once('drain', resolve);
                }
            });
        },
        close() {
            return new Promise((resolve, reject) => {
                duplex.end(resolve);
            });
        },
        abort(reason) {
            duplex.destroy(new Error(reason));
        }
    });
    return { readable, writable };
}
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