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'use strict';
const common = require('../common');
const stream = require('stream');
const util = require('util');
function Writable() {
this.writable = true;
stream.Writable.call(this);
this.prependListener = undefined;
}
util.inherits(Writable, stream.Writable);
Writable.prototype._write = function(chunk, end, cb) {
cb();
};
function Readable() {
this.readable = true;
stream.Readable.call(this);
}
util.inherits(Readable, stream.Readable);
Readable.prototype._read = function() {
this.push(null);
};
const w = new Writable();
w.on('pipe', common.mustCall(function() {}));
const r = new Readable();
r.pipe(w);