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'use strict';
const common = require('../common');
const assert = require('assert');
const { Readable, Writable, Duplex, Transform } = require('stream');
const readable = new Readable({ read() {} });
const writable = new Writable({ write() {} });
const duplex = new Duplex({ read() {}, write() {} });
const transform = new Transform({ transform() {} });
assert.ok(readable instanceof Readable);
assert.ok(!(writable instanceof Readable));
assert.ok(duplex instanceof Readable);
assert.ok(transform instanceof Readable);
assert.ok(!(readable instanceof Writable));
assert.ok(writable instanceof Writable);
assert.ok(duplex instanceof Writable);
assert.ok(transform instanceof Writable);
assert.ok(!(readable instanceof Duplex));
assert.ok(!(writable instanceof Duplex));
assert.ok(duplex instanceof Duplex);
assert.ok(transform instanceof Duplex);
assert.ok(!(readable instanceof Transform));
assert.ok(!(writable instanceof Transform));
assert.ok(!(duplex instanceof Transform));
assert.ok(transform instanceof Transform);
assert.ok(!(null instanceof Writable));
assert.ok(!(undefined instanceof Writable));
// Simple inheritance check for `Writable` works fine in a subclass constructor.
function CustomWritable() {
assert.ok(
this instanceof CustomWritable,
`${this} does not inherit from CustomWritable`
);
assert.ok(
this instanceof Writable,
`${this} does not inherit from Writable`
);
}
Object.setPrototypeOf(CustomWritable, Writable);
Object.setPrototypeOf(CustomWritable.prototype, Writable.prototype);
new CustomWritable();
common.expectsError(
CustomWritable,
{
code: 'ERR_ASSERTION',
type: assert.AssertionError,
message: 'undefined does not inherit from CustomWritable'
}
);
class OtherCustomWritable extends Writable {}
assert(!(new OtherCustomWritable() instanceof CustomWritable));
assert(!(new CustomWritable() instanceof OtherCustomWritable));