@johngw/stream/dist/transformers/map.js

Reactive programming tools using the WHATWG Streams API.

/**
 * Transforms chunks from one value to another.
 *
 * @group Transformers
 * @example
 * ```
 * --1----2----3----4----|
 *
 * map((x) => x + 1)
 *
 * --2----3----4----5----|
 * ```
 */
export function map(fn) {
    return new TransformStream({
        async transform(chunk, controller) {
            try {
                controller.enqueue(await fn(chunk));
            }
            catch (error) {
                controller.error(error);
            }
        },
    });
}
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