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'use strict';
const common = require('../common');
const stream = require('stream');
class Writable extends stream.Writable {
constructor() {
super();
this.prependListener = undefined;
}
_write(chunk, end, cb) {
cb();
}
}
class Readable extends stream.Readable {
_read() {
this.push(null);
}
}
const w = new Writable();
w.on('pipe', common.mustCall());
const r = new Readable();
r.pipe(w);