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'use strict'; const common = require('../common'); const assert = require('assert'); const { Readable, Writable, PassThrough } = require('stream'); { let ticks = 17; const rs = new Readable({ objectMode: true, read: () => { if (ticks-- > 0) return process.nextTick(() => rs.push({})); rs.push({}); rs.push(null); } }); const ws = new Writable({ highWaterMark: 0, objectMode: true, write: (data, end, cb) => setImmediate(cb) }); rs.on('end', common.mustCall()); ws.on('finish', common.mustCall()); rs.pipe(ws); } { let missing = 8; const rs = new Readable({ objectMode: true, read: () => { if (missing--) rs.push({}); else rs.push(null); } }); const pt = rs .pipe(new PassThrough({ objectMode: true, highWaterMark: 2 })) .pipe(new PassThrough({ objectMode: true, highWaterMark: 2 })); pt.on('end', () => { wrapper.push(null); }); const wrapper = new Readable({ objectMode: true, read: () => { process.nextTick(() => { let data = pt.read(); if (data === null) { pt.once('readable', () => { data = pt.read(); if (data !== null) wrapper.push(data); }); } else { wrapper.push(data); } }); } }); wrapper.resume(); wrapper.on('end', common.mustCall()); } { // Only register drain if there is backpressure. const rs = new Readable({ read() {} }); const pt = rs .pipe(new PassThrough({ objectMode: true, highWaterMark: 2 })); assert.strictEqual(pt.listenerCount('drain'), 0); pt.on('finish', () => { assert.strictEqual(pt.listenerCount('drain'), 0); }); rs.push('asd'); assert.strictEqual(pt.listenerCount('drain'), 0); process.nextTick(() => { rs.push('asd'); assert.strictEqual(pt.listenerCount('drain'), 0); rs.push(null); assert.strictEqual(pt.listenerCount('drain'), 0); }); }