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45 lines
1.5 KiB
45 lines
1.5 KiB
'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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assert.ok(!(null instanceof Writable));
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assert.ok(!(undefined instanceof Writable));
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// Simple inheritance check for `Writable` works fine in a subclass constructor.
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function CustomWritable() {
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assert.ok(this instanceof Writable, 'inherits from Writable');
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assert.ok(this instanceof CustomWritable, 'inherits from CustomWritable');
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}
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Object.setPrototypeOf(CustomWritable, Writable);
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Object.setPrototypeOf(CustomWritable.prototype, Writable.prototype);
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new CustomWritable();
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assert.throws(CustomWritable, /AssertionError: inherits from Writable/);
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