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2a4b068aca
Use `[Symbol.hasInstance]()` to return `true` when asking for `new Duplex() instanceof Writable`. PR-URL: https://github.com/nodejs/node/pull/8834 Reviewed-By: James M Snell <jasnell@gmail.com> Reviewed-By: Matteo Collina <matteo.collina@gmail.com> Reviewed-By: Calvin Metcalf <calvin.metcalf@gmail.com>
30 lines
1013 B
JavaScript
30 lines
1013 B
JavaScript
'use strict';
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require('../common');
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const assert = require('assert');
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const { Readable, Writable, Duplex, Transform } = require('stream');
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const readable = new Readable({ read() {} });
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const writable = new Writable({ write() {} });
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const duplex = new Duplex({ read() {}, write() {} });
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const transform = new Transform({ transform() {} });
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assert.ok(readable instanceof Readable);
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assert.ok(!(writable instanceof Readable));
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assert.ok(duplex instanceof Readable);
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assert.ok(transform instanceof Readable);
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assert.ok(!(readable instanceof Writable));
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assert.ok(writable instanceof Writable);
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assert.ok(duplex instanceof Writable);
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assert.ok(transform instanceof Writable);
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assert.ok(!(readable instanceof Duplex));
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assert.ok(!(writable instanceof Duplex));
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assert.ok(duplex instanceof Duplex);
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assert.ok(transform instanceof Duplex);
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assert.ok(!(readable instanceof Transform));
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assert.ok(!(writable instanceof Transform));
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assert.ok(!(duplex instanceof Transform));
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assert.ok(transform instanceof Transform);
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