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stream: fix Writable subclass instanceof checks #9088

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stream: fix Writable subclass instanceof checks #9088

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addaleax
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Checklist
  • make -j8 test (UNIX), or vcbuild test nosign (Windows) passes
  • tests and/or benchmarks are included
  • commit message follows commit guidelines
Affected core subsystem(s)

stream

Description of change

2a4b068 introduced a regression in where checking instanceof would fail for Writable subclasses inside the subclass constructor, i.e. before Writable() was called.

Also, calling null instanceof Writable or undefined instanceof Writable would fail due to accessing the _writableState property of the target object.

This fixes these problems.

Ref: #8834 (comment)

@addaleax
stream: fix Writable subclass instanceof checks
7fe8672 
2a4b068 introduced a regression in where checking
`instanceof` would fail for `Writable` subclasses inside the
subclass constructor, i.e. before `Writable()` was called.

Also, calling `null instanceof Writable` or
`undefined instanceof Writable` would fail due to accessing the
`_writableState` property of the target object.

This fixes these problems.

Ref: nodejs#8834 (comment)
@nodejs-github-bot nodejs-github-bot added the stream Issues and PRs related to the stream subsystem. label Oct 13, 2016
@addaleax addaleax mentioned this pull request Oct 13, 2016
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@Fishrock123 Fishrock123 mentioned this pull request Oct 13, 2016
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@addaleax
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CI: https://ci.nodejs.org/job/node-test-commit/5601/
CITGM: https://ci.nodejs.org/view/Node.js-citgm/job/citgm-smoker/413/

/cc @nodejs/streams

imyller
imyller approved these changes Oct 13, 2016
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LGTM

@MylesBorins
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/cc @mcollina

mcollina
mcollina reviewed Oct 14, 2016
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lib/_stream_writable.js
@@ -141,9 +141,12 @@ if (typeof Symbol === 'function' && Symbol.hasInstance) {
realHasInstance = Function.prototype[Symbol.hasInstance];
Object.defineProperty(Writable, Symbol.hasInstance, {
value: function(object) {
if (realHasInstance.call(this, object))
return true;

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how does this affect LazyTransform?

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@mcollina It works fine (otherwise there are failing tests). LazyTransform is only affected by the conditional in the Writable constructor, and that’s left unchanged here,

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can you update the comment below and maybe move it to the constructor then.

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@mcollina done, ptal

Fishrock123
Fishrock123 approved these changes Oct 14, 2016
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lgtm if tests are passing, it's better than what is currently public for sure

jasnell
jasnell approved these changes Oct 14, 2016
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LGTM

@evanlucas
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Is this good to land?

@mcollina
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LGTM

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@evanlucas
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LGTM

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Landing before the 48h minimum so we can get a non-broken version of v6 out

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Landed in 7922830

@evanlucas evanlucas closed this Oct 14, 2016
evanlucas pushed a commit that referenced this pull request Oct 14, 2016
@addaleax @evanlucas
stream: fix Writable subclass instanceof checks
7922830 
2a4b068 introduced a regression in where checking
`instanceof` would fail for `Writable` subclasses inside the
subclass constructor, i.e. before `Writable()` was called.

Also, calling `null instanceof Writable` or
`undefined instanceof Writable` would fail due to accessing the
`_writableState` property of the target object.

This fixes these problems.

PR-URL: #9088
Ref: #8834 (comment)
Reviewed-By: Ilkka Myller <ilkka.myller@nodefield.com>
Reviewed-By: Jeremiah Senkpiel <fishrock123@rocketmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Matteo Collina <matteo.collina@gmail.com>
Reviewed-By: Evan Lucas <evanlucas@me.com>
evanlucas pushed a commit that referenced this pull request Oct 14, 2016
@addaleax @evanlucas
stream: fix Writable subclass instanceof checks
8b90814 
2a4b068 introduced a regression in where checking
`instanceof` would fail for `Writable` subclasses inside the
subclass constructor, i.e. before `Writable()` was called.

Also, calling `null instanceof Writable` or
`undefined instanceof Writable` would fail due to accessing the
`_writableState` property of the target object.

This fixes these problems.

PR-URL: #9088
Ref: #8834 (comment)
Reviewed-By: Ilkka Myller <ilkka.myller@nodefield.com>
Reviewed-By: Jeremiah Senkpiel <fishrock123@rocketmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Matteo Collina <matteo.collina@gmail.com>
Reviewed-By: Evan Lucas <evanlucas@me.com>
evanlucas pushed a commit that referenced this pull request Oct 14, 2016
@addaleax @evanlucas
stream: fix Writable subclass instanceof checks
8c4fab0 
2a4b068 introduced a regression in where checking
`instanceof` would fail for `Writable` subclasses inside the
subclass constructor, i.e. before `Writable()` was called.

Also, calling `null instanceof Writable` or
`undefined instanceof Writable` would fail due to accessing the
`_writableState` property of the target object.

This fixes these problems.

PR-URL: #9088
Ref: #8834 (comment)
Reviewed-By: Ilkka Myller <ilkka.myller@nodefield.com>
Reviewed-By: Jeremiah Senkpiel <fishrock123@rocketmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Matteo Collina <matteo.collina@gmail.com>
Reviewed-By: Evan Lucas <evanlucas@me.com>
@evanlucas evanlucas mentioned this pull request Oct 14, 2016
Merged
evanlucas added a commit that referenced this pull request Oct 14, 2016
@evanlucas
2016-10-14, Version 6.8.1 (Current)
c6a397b 
* build: Fix building with shared zlib. (Bradley T. Hughes) [#9077](#9077)
* stream: fix `Writable` subclass instanceof checks (Anna Henningsen) [#9088](#9088)
* timers: fix regression with clearImmediate() (Brian White) [#9086](#9086)

PR-URL: #9104
evanlucas added a commit that referenced this pull request Oct 15, 2016
@evanlucas
2016-10-14, Version 6.8.1 (Current)
113c697 
* build: Fix building with shared zlib. (Bradley T. Hughes) [#9077](#9077)
* stream: fix `Writable` subclass instanceof checks (Anna Henningsen) [#9088](#9088)
* timers: fix regression with clearImmediate() (Brian White) [#9086](#9086)

PR-URL: #9104
@addaleax addaleax deleted the fix-writable-instanceof branch October 15, 2016 23:29
jasnell pushed a commit that referenced this pull request Oct 17, 2016
@addaleax @jasnell
stream: fix Writable subclass instanceof checks
ee9062b 
2a4b068 introduced a regression in where checking
`instanceof` would fail for `Writable` subclasses inside the
subclass constructor, i.e. before `Writable()` was called.

Also, calling `null instanceof Writable` or
`undefined instanceof Writable` would fail due to accessing the
`_writableState` property of the target object.

This fixes these problems.

PR-URL: #9088
Ref: #8834 (comment)
Reviewed-By: Ilkka Myller <ilkka.myller@nodefield.com>
Reviewed-By: Jeremiah Senkpiel <fishrock123@rocketmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Matteo Collina <matteo.collina@gmail.com>
Reviewed-By: Evan Lucas <evanlucas@me.com>
imyller added a commit to imyller/meta-nodejs that referenced this pull request Oct 17, 2016
@imyller
2016-10-14, Version 6.8.1 (Current)
c84b420 
    * build: Fix building with shared zlib. (Bradley T. Hughes) [#9077](nodejs/node#9077)
    * stream: fix `Writable` subclass instanceof checks (Anna Henningsen) [#9088](nodejs/node#9088)
    * timers: fix regression with clearImmediate() (Brian White) [#9086](nodejs/node#9086)

Signed-off-by: Ilkka Myller <ilkka.myller@nodefield.com>
imyller added a commit to imyller/meta-nodejs that referenced this pull request Oct 17, 2016
@imyller
2016-10-14, Version 6.8.1 (Current)
aa4dfb9 
    * build: Fix building with shared zlib. (Bradley T. Hughes) [#9077](nodejs/node#9077)
    * stream: fix `Writable` subclass instanceof checks (Anna Henningsen) [#9088](nodejs/node#9088)
    * timers: fix regression with clearImmediate() (Brian White) [#9086](nodejs/node#9086)

Signed-off-by: Ilkka Myller <ilkka.myller@nodefield.com>
@zertosh zertosh mentioned this pull request Oct 17, 2016
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@aliscco aliscco mentioned this pull request Nov 29, 2023
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@leonardoadame leonardoadame mentioned this pull request Nov 29, 2023
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@mcollina mcollina mcollina left review comments

@jasnell jasnell jasnell approved these changes

@Fishrock123 Fishrock123 Fishrock123 approved these changes

@imyller imyller imyller approved these changes

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@addaleax @MylesBorins @evanlucas @mcollina @jasnell @Fishrock123 @imyller @nodejs-github-bot