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'use strict'; require('../common'); const assert = require('assert'); const { Transform, Readable, Writable } = require('stream'); const DEFAULT = 16 * 1024; function testTransform(expectedReadableHwm, expectedWritableHwm, options) { const t = new Transform(options); assert.strictEqual(t._readableState.highWaterMark, expectedReadableHwm); assert.strictEqual(t._writableState.highWaterMark, expectedWritableHwm); } // Test overriding defaultHwm testTransform(666, DEFAULT, { readableHighWaterMark: 666 }); testTransform(DEFAULT, 777, { writableHighWaterMark: 777 }); testTransform(666, 777, { readableHighWaterMark: 666, writableHighWaterMark: 777, }); // Test highWaterMark overriding testTransform(555, 555, { highWaterMark: 555, readableHighWaterMark: 666, }); testTransform(555, 555, { highWaterMark: 555, writableHighWaterMark: 777, }); testTransform(555, 555, { highWaterMark: 555, readableHighWaterMark: 666, writableHighWaterMark: 777, }); // Test undefined, null [undefined, null].forEach((v) => { testTransform(DEFAULT, DEFAULT, { readableHighWaterMark: v }); testTransform(DEFAULT, DEFAULT, { writableHighWaterMark: v }); testTransform(666, DEFAULT, { highWaterMark: v, readableHighWaterMark: 666 }); testTransform(DEFAULT, 777, { highWaterMark: v, writableHighWaterMark: 777 }); }); // test NaN { assert.throws(() => { new Transform({ readableHighWaterMark: NaN }); }, { name: 'TypeError', code: 'ERR_INVALID_ARG_VALUE', message: "The property 'options.readableHighWaterMark' is invalid. " + 'Received NaN' }); assert.throws(() => { new Transform({ writableHighWaterMark: NaN }); }, { name: 'TypeError', code: 'ERR_INVALID_ARG_VALUE', message: "The property 'options.writableHighWaterMark' is invalid. " + 'Received NaN' }); } // Test non Duplex streams ignore the options { const r = new Readable({ readableHighWaterMark: 666 }); assert.strictEqual(r._readableState.highWaterMark, DEFAULT); const w = new Writable({ writableHighWaterMark: 777 }); assert.strictEqual(w._writableState.highWaterMark, DEFAULT); }