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

Convert Node.js streams to streaming iterables

import { duplex } from './duplex.js';
/**
 * Convert a [`Transform`](https://nodejs.org/dist/latest/docs/api/stream.html#class-streamtransform)
 * stream to an [iterable transform](https://achingbrain.github.io/it-stream-types/interfaces/Transform.html).
 */
export function transform(transform) {
    return async function* (source) {
        const d = duplex(transform);
        // In a transform the sink and source are connected, an error in the sink
        // will be thrown in the source also. Catch the sink error to avoid unhandled
        // rejections and yield from the source.
        let sinkError;
        d.sink(source)
            .catch((err) => {
            sinkError = err;
        });
        yield* d.source;
        if (sinkError != null) {
            throw sinkError;
        }
    };
}
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