stream-to-it/dist/src/source.js

Convert Node.js streams to streaming iterables

/**
 * Convert a Node.js [`Readable`](https://nodejs.org/dist/latest/docs/api/stream.html#class-streamreadable)
 * stream or a browser [`ReadableStream`](https://developer.mozilla.org/en-US/docs/Web/API/ReadableStream)
 * to an [iterable source](https://achingbrain.github.io/it-stream-types/types/Source.html).
 */
export function source(readable) {
    // Browser ReadableStream
    if (isReadableStream(readable)) {
        return (async function* () {
            const reader = readable.getReader();
            try {
                while (true) {
                    const { done, value } = await reader.read();
                    if (done) {
                        return;
                    }
                    yield value;
                }
            }
            finally {
                reader.releaseLock();
            }
        })();
    }
    if (isNodeStream(readable)) {
        return readable;
    }
    throw new Error('unknown stream');
}
function isNodeStream(obj) {
    return obj[Symbol.asyncIterator] != null;
}
function isReadableStream(obj) {
    return typeof obj?.getReader === 'function';
}
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