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'use strict';

// Pull-based ReadableStream: data produced only when the consumer reads

const countStream = (max) => {

let n = 0;

return new ReadableStream({

pull(controller) {

n += 1;

console.log('pull produced', n);

controller.enqueue(n);

if (n >= max) controller.close();

});

};

// Usage

const main = async () => {

const reader = countStream(3).getReader();

console.log('reader created (no pull yet)');

while (true) {

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

if (done) break;

console.log('got', value);

}

};

main();