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'use strict';

const upper = new TransformStream({

transform(chunk, controller) {

controller.enqueue(String(chunk).toUpperCase());

});

const source = new ReadableStream({

start(controller) {

for (const word of ['web', 'streams', 'transform']) {

controller.enqueue(word);

}

controller.close();

});

// Usage

const main = async () => {

const reader = source.pipeThrough(upper).getReader();

while (true) {

const { done, value } = await reader.read();

if (done) break;

console.log(value);

}

};

main();