Re: [Wikitech-l] The mw.ext construct in lua modules

[John Erling Blad]

Those that break the naming scheme *somehow* is 7 extensions
(ArticlePlaceholder (mixed case), DynamicPageListEngine (not extension
name), JsonConfig (not extension name), LinkedWiki (not ext
structure), SemanticScribunto (not extension name), Wikibase Client
(not ext structure), ZeroPortal (not ext structure)) of a total of 17.
I have not counted two of my own that will not follow this scheme, and
Capiunto which use require. I have neither included TemplateData.

That is; the naming scheme is followed by approx 40% of the extensions.

There are probably some lua-libs I haven't found.

-- list --
# ArticlePlaceholder
mw.ext.articlePlaceholder

# TitleBlacklist
mw.ext.TitleBlacklist (Only a single method)

# BootstrapCompoinents
mw.bootstrap.*

# Capiunto
Doc says mw.capiunto, but this seems wrong

# Cargo
mw.ext.cargo

# DataTable2
mw.ext.datatable2

# DisplayTitle
mw.ext.displaytitle

# DynamicPageListEngine
mw.ext.dpl

# FlaggedRevs
mw.ext.FlaggedRevs

# Inference
Under development.

# JsonConfig
mw.ext.data.get

# LinkedWiki
mw.linkedwiki

# ParserFunctions
mw.ext.ParserFunctions (Only a single method)

# Pickle
Under development. Uses another loader.

# SemanticScribunto
mw.smw

# TimeConvert
mw.ext.timeconvert

# TitleBlacklist
mw.ext.TitleBlacklist

# VariablesLua
mw.ext.VariablesLua

# Wikibase Client
mw.wikibase

# ZeroPortal
mw.zeroportal

On Tue, Feb 5, 2019 at 5:50 PM Brad Jorsch (Anomie)
 wrote:
>
> On Mon, Feb 4, 2019 at 5:26 PM Eran Rosenthal  wrote:
>
> > > What is the problem with the ".ext" part?
> > 1. It adds unnecessary complexity both in the extension (need to init
> > mw.ext if it doesn't exist)
>
>
> It's one line in the boilerplate. That's not much complexity.
>
>
> > and more important - in its usage when the Lua
> > extension is invoked (longer names)
> >
>
> It's 4 characters. Also not much to be concerned about. You're also free to
> do like
>
> local foo = mw.ext.foo;
>
> if you want shorter access within your code.
>
>
> >(there is very small risk of name collision -  mw.ModuleA and mw.ModuleB
> > are unlikely to clash as different extensions, and mw.ModuleA and mw.FUNC
> > are unlikely to clash because function names
> > <
> > https://www.mediawiki.org/wiki/Extension:Scribunto/Lua_reference_manual#Base_functions
> > >
> > are usually verbs and extensions
> >  are usually
> > nouns)
> >
>
> Scribunto has its own built-in packages too, which are also usually nouns.
> What if, for example, Extension:Math
>  added a Scribunto module at
> "mw.math" and then we also wanted to add a Scribunto-specific version of Lua's
> math library
> ?
> Or Extension:CSS  and a
> Scribunto counterpart to mw.html
> ?
> Or if Extension:UserFunctions
>  did its thing at
> "mw.user" and then we got around to resolving T85419
> ?
>
> Having mw.ext also makes it easier to identify extensions' additions,
> avoiding confusion over whether "mw.foo" is part of Scribunto or comes from
> another extension. And it means you can look in mw.ext to see which
> extensions' additions are available rather than having to filter them out
> of mw.
>
> BTW, we have "mw" in the first place to similarly bundle Scribunto's
> additions away from things that come with standard Lua. If someday standard
> Lua includes its own "ustring" or something else Scribunto adds a module
> for (and we upgrade from Lua 5.1), we won't need to worry about name
> collision there either.
>
>
> > 2. Practically the convention is to not use mw.ext - the convention (based
> > on most of the Lua code - e.g wikibase) is to not use mw.ext
> >
>
> Of extensions in Gerrit (as of a few days ago when I last checked),
> Wikibase and LinkedWiki seem to be the only two extensions not using
> mw.ext, while Cargo, DataTable2, DisplayTitle, DynamicPageListEngine,
> FlaggedRevs, JsonConfig, ParserFunctions, and TitleBlacklist all do.
>
> --
> Brad Jorsch (Anomie)
> Senior Software Engineer
> Wikimedia Foundation
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Re: [Wikitech-l] The mw.ext construct in lua modules

[Brad Jorsch (Anomie)]

On Mon, Feb 4, 2019 at 5:26 PM Eran Rosenthal  wrote:

> > What is the problem with the ".ext" part?
> 1. It adds unnecessary complexity both in the extension (need to init
> mw.ext if it doesn't exist)


It's one line in the boilerplate. That's not much complexity.


> and more important - in its usage when the Lua
> extension is invoked (longer names)
>

It's 4 characters. Also not much to be concerned about. You're also free to
do like

local foo = mw.ext.foo;

if you want shorter access within your code.


>(there is very small risk of name collision -  mw.ModuleA and mw.ModuleB
> are unlikely to clash as different extensions, and mw.ModuleA and mw.FUNC
> are unlikely to clash because function names
> <
> https://www.mediawiki.org/wiki/Extension:Scribunto/Lua_reference_manual#Base_functions
> >
> are usually verbs and extensions
>  are usually
> nouns)
>

Scribunto has its own built-in packages too, which are also usually nouns.
What if, for example, Extension:Math
 added a Scribunto module at
"mw.math" and then we also wanted to add a Scribunto-specific version of Lua's
math library
?
Or Extension:CSS  and a
Scribunto counterpart to mw.html
?
Or if Extension:UserFunctions
 did its thing at
"mw.user" and then we got around to resolving T85419
?

Having mw.ext also makes it easier to identify extensions' additions,
avoiding confusion over whether "mw.foo" is part of Scribunto or comes from
another extension. And it means you can look in mw.ext to see which
extensions' additions are available rather than having to filter them out
of mw.

BTW, we have "mw" in the first place to similarly bundle Scribunto's
additions away from things that come with standard Lua. If someday standard
Lua includes its own "ustring" or something else Scribunto adds a module
for (and we upgrade from Lua 5.1), we won't need to worry about name
collision there either.


> 2. Practically the convention is to not use mw.ext - the convention (based
> on most of the Lua code - e.g wikibase) is to not use mw.ext
>

Of extensions in Gerrit (as of a few days ago when I last checked),
Wikibase and LinkedWiki seem to be the only two extensions not using
mw.ext, while Cargo, DataTable2, DisplayTitle, DynamicPageListEngine,
FlaggedRevs, JsonConfig, ParserFunctions, and TitleBlacklist all do.

-- 
Brad Jorsch (Anomie)
Senior Software Engineer
Wikimedia Foundation
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Re: [Wikitech-l] The mw.ext construct in lua modules

[Eran Rosenthal]

> What is the problem with the ".ext" part?
1. It adds unnecessary complexity both in the extension (need to init
mw.ext if it doesn't exist) and more important - in its usage when the Lua
extension is invoked (longer names)
   (there is very small risk of name collision -  mw.ModuleA and mw.ModuleB
are unlikely to clash as different extensions, and mw.ModuleA and mw.FUNC
are unlikely to clash because function names

are usually verbs and extensions
 are usually nouns)
2. Practically the convention is to not use mw.ext - the convention (based
on most of the Lua code - e.g wikibase) is to not use mw.ext

> What is the benefit of moving existing code that is so heavily used?
consistency and alignment to some code convention (2). [keeping backward
compatibility can be with mw.wikibase=mw.ext.wikibase with deprecation
notice]
If we believe ext is good convention we should drive to align it and at
least to allow usages

to align to that convention.  (google counts 3K usages - if we don't fix
it, it will be much harder to fix it later)
if we don't believe this is good convention, we shouldn't impose it on new
Lua extensions.

Thanks,
Eran





On Mon, Feb 4, 2019 at 4:13 PM Thiemo Kreuz 
wrote:

> > […] I think mw.ext.EXTNAME should be avoided […]
>
> Can I ask to provide arguments that help others understand this
> opinion better? What is the problem with the ".ext" part?
>
> > […] or we should reject this proposal and open phab ticket to wikibase
> to change mw.wikibase to mw.ext.wikibase everywhere […]
>
> How is this an unavoidable consequence of deciding on a standard new
> code should follow? What is the benefit of moving existing code that
> is so heavily used?
>
> Kind regards
> Thiemo
>
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Re: [Wikitech-l] The mw.ext construct in lua modules

[Thiemo Kreuz]

> […] I think mw.ext.EXTNAME should be avoided […]

Can I ask to provide arguments that help others understand this
opinion better? What is the problem with the ".ext" part?

> […] or we should reject this proposal and open phab ticket to wikibase to 
> change mw.wikibase to mw.ext.wikibase everywhere […]

How is this an unavoidable consequence of deciding on a standard new
code should follow? What is the benefit of moving existing code that
is so heavily used?

Kind regards
Thiemo

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Re: [Wikitech-l] The mw.ext construct in lua modules

[Greg Rundlett (freephile)]

Sound proposal in my opinion.

Greg Rundlett
https://eQuality-Tech.com
https://freephile.org


On Sat, Feb 2, 2019 at 8:32 AM Eran Rosenthal  wrote:

> I agree with John, and I think mw.ext.EXTNAME should be avoided and we
> should prefer mw.EXTNAME which is clear and simple and fills very native.
> This is already the way it is used in wikibase (mw.wikibase.FUNCNAME) which
> I believe is the most heavily used extension exposing Lua interface.
>
> To conclude:
> 1. We should either accept this convention (dropping the "ext") and update
> https://www.mediawiki.org/wiki/Extension:Scribunto/Example_extension
> 2. or we should reject this proposal and open phab ticket to wikibase to
> change mw.wikibase to mw.ext.wikibase everywhere (probably keeping the
> first for backward compatibility)
>
> Thanks,
> Eran
>
>
>
> On Fri, Jan 25, 2019 at 9:48 PM John Erling Blad  wrote:
>
> > There are several extensions that diverge on the naming scheme. Some
> > of them even being referenced as using the scheme, while not providing
> > lua libs at all. It is a bit weird.
> >
> > On Fri, Jan 25, 2019 at 7:09 PM Kunal Mehta 
> > wrote:
> > >
> > > -BEGIN PGP SIGNED MESSAGE-
> > > Hash: SHA512
> > >
> > > Hi,
> > >
> > > On 1/24/19 11:33 PM, Thiemo Kreuz wrote:
> > > > Is there a question assigned with this long email? Is this a call
> > > > for feedback?
> > >
> > > I think this is probably related to/coming from
> > > .
> > >
> > > - -- Legoktm
> > > -BEGIN PGP SIGNATURE-
> > >
> > > iQIzBAEBCgAdFiEE2MtZ8F27ngU4xIGd8QX4EBsFJpsFAlxLUJcACgkQ8QX4EBsF
> > > JpuIGRAAtHXuDQqmJK+fqKiMYrzRE7aXkX/pis7z7F5nncPWfHpaMFKFMHeAu4/d
> > > PHvpJqifXi5LwCV/YSAugmZJaQ1FFn2u+/ZA9sXAAR0JBvHnY/A5unmfXkzpteEP
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> > > OHwUeHj+M6i5UqnP0HiRBSHeFWo9it6RSXEd+lfVNbn46VJZ3zkNUFDqkWeJOWgs
> > > o3N781lCdRbcn/P3V+k2CkQhVqjGPb/MgxUyQAreup8fcwBcDiDkj7wNnnUETVuS
> > > EYg3Fc/xlrjIKYO54LSU5kHphEhCxAHdbxol8X8mNPQ3IHGQpyJCCSX6+qSGM/0+
> > > CYtNh+ktJSyghmdUv2QOvjSkObTKL2HV9yLD3a/3qqO+Pekn9mnoNax/Splr0bV2
> > > OkK9KMBEd73+/r+6hmhQoJdESOjLofyzoT9ohR3xWlJSfH8XOAWkphbuu87Dp0k1
> > > KNjue1eP0KY5bO4+64hnqbCpeVpJiaQjkw+uCTmLz7u7tBME1rt7D+3D0PizXENN
> > > NNkLc4XNl4ouKti3Yhkx0P4TAy/QIDR15M0eSSikHJI8PehqnRU=
> > > =V+xr
> > > -END PGP SIGNATURE-
> > >
> > > ___
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> >
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Re: [Wikitech-l] The mw.ext construct in lua modules

[Eran Rosenthal]

I agree with John, and I think mw.ext.EXTNAME should be avoided and we
should prefer mw.EXTNAME which is clear and simple and fills very native.
This is already the way it is used in wikibase (mw.wikibase.FUNCNAME) which
I believe is the most heavily used extension exposing Lua interface.

To conclude:
1. We should either accept this convention (dropping the "ext") and update
https://www.mediawiki.org/wiki/Extension:Scribunto/Example_extension
2. or we should reject this proposal and open phab ticket to wikibase to
change mw.wikibase to mw.ext.wikibase everywhere (probably keeping the
first for backward compatibility)

Thanks,
Eran



On Fri, Jan 25, 2019 at 9:48 PM John Erling Blad  wrote:

> There are several extensions that diverge on the naming scheme. Some
> of them even being referenced as using the scheme, while not providing
> lua libs at all. It is a bit weird.
>
> On Fri, Jan 25, 2019 at 7:09 PM Kunal Mehta 
> wrote:
> >
> > -BEGIN PGP SIGNED MESSAGE-
> > Hash: SHA512
> >
> > Hi,
> >
> > On 1/24/19 11:33 PM, Thiemo Kreuz wrote:
> > > Is there a question assigned with this long email? Is this a call
> > > for feedback?
> >
> > I think this is probably related to/coming from
> > .
> >
> > - -- Legoktm
> > -BEGIN PGP SIGNATURE-
> >
> > iQIzBAEBCgAdFiEE2MtZ8F27ngU4xIGd8QX4EBsFJpsFAlxLUJcACgkQ8QX4EBsF
> > JpuIGRAAtHXuDQqmJK+fqKiMYrzRE7aXkX/pis7z7F5nncPWfHpaMFKFMHeAu4/d
> > PHvpJqifXi5LwCV/YSAugmZJaQ1FFn2u+/ZA9sXAAR0JBvHnY/A5unmfXkzpteEP
> > eUSCtexL5vjyjVo+Yd/ixbg06FS9Jc/6dxECxb6/A84gjHHQxA9drK4bkLZRvGPj
> > 2oInMsB37iBj5/Q/ShO8Km2hz7HJ/zNyW5ljFTYwTKzNiPBcGdswMLu4vj0ALfIF
> > OHwUeHj+M6i5UqnP0HiRBSHeFWo9it6RSXEd+lfVNbn46VJZ3zkNUFDqkWeJOWgs
> > o3N781lCdRbcn/P3V+k2CkQhVqjGPb/MgxUyQAreup8fcwBcDiDkj7wNnnUETVuS
> > EYg3Fc/xlrjIKYO54LSU5kHphEhCxAHdbxol8X8mNPQ3IHGQpyJCCSX6+qSGM/0+
> > CYtNh+ktJSyghmdUv2QOvjSkObTKL2HV9yLD3a/3qqO+Pekn9mnoNax/Splr0bV2
> > OkK9KMBEd73+/r+6hmhQoJdESOjLofyzoT9ohR3xWlJSfH8XOAWkphbuu87Dp0k1
> > KNjue1eP0KY5bO4+64hnqbCpeVpJiaQjkw+uCTmLz7u7tBME1rt7D+3D0PizXENN
> > NNkLc4XNl4ouKti3Yhkx0P4TAy/QIDR15M0eSSikHJI8PehqnRU=
> > =V+xr
> > -END PGP SIGNATURE-
> >
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Re: [Wikitech-l] The mw.ext construct in lua modules

[John Erling Blad]

There are several extensions that diverge on the naming scheme. Some
of them even being referenced as using the scheme, while not providing
lua libs at all. It is a bit weird.

On Fri, Jan 25, 2019 at 7:09 PM Kunal Mehta  wrote:
>
> -BEGIN PGP SIGNED MESSAGE-
> Hash: SHA512
>
> Hi,
>
> On 1/24/19 11:33 PM, Thiemo Kreuz wrote:
> > Is there a question assigned with this long email? Is this a call
> > for feedback?
>
> I think this is probably related to/coming from
> .
>
> - -- Legoktm
> -BEGIN PGP SIGNATURE-
>
> iQIzBAEBCgAdFiEE2MtZ8F27ngU4xIGd8QX4EBsFJpsFAlxLUJcACgkQ8QX4EBsF
> JpuIGRAAtHXuDQqmJK+fqKiMYrzRE7aXkX/pis7z7F5nncPWfHpaMFKFMHeAu4/d
> PHvpJqifXi5LwCV/YSAugmZJaQ1FFn2u+/ZA9sXAAR0JBvHnY/A5unmfXkzpteEP
> eUSCtexL5vjyjVo+Yd/ixbg06FS9Jc/6dxECxb6/A84gjHHQxA9drK4bkLZRvGPj
> 2oInMsB37iBj5/Q/ShO8Km2hz7HJ/zNyW5ljFTYwTKzNiPBcGdswMLu4vj0ALfIF
> OHwUeHj+M6i5UqnP0HiRBSHeFWo9it6RSXEd+lfVNbn46VJZ3zkNUFDqkWeJOWgs
> o3N781lCdRbcn/P3V+k2CkQhVqjGPb/MgxUyQAreup8fcwBcDiDkj7wNnnUETVuS
> EYg3Fc/xlrjIKYO54LSU5kHphEhCxAHdbxol8X8mNPQ3IHGQpyJCCSX6+qSGM/0+
> CYtNh+ktJSyghmdUv2QOvjSkObTKL2HV9yLD3a/3qqO+Pekn9mnoNax/Splr0bV2
> OkK9KMBEd73+/r+6hmhQoJdESOjLofyzoT9ohR3xWlJSfH8XOAWkphbuu87Dp0k1
> KNjue1eP0KY5bO4+64hnqbCpeVpJiaQjkw+uCTmLz7u7tBME1rt7D+3D0PizXENN
> NNkLc4XNl4ouKti3Yhkx0P4TAy/QIDR15M0eSSikHJI8PehqnRU=
> =V+xr
> -END PGP SIGNATURE-
>
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Re: [Wikitech-l] The mw.ext construct in lua modules

[Kunal Mehta]

-BEGIN PGP SIGNED MESSAGE-
Hash: SHA512

Hi,

On 1/24/19 11:33 PM, Thiemo Kreuz wrote:
> Is there a question assigned with this long email? Is this a call
> for feedback?

I think this is probably related to/coming from
.

- -- Legoktm
-BEGIN PGP SIGNATURE-

iQIzBAEBCgAdFiEE2MtZ8F27ngU4xIGd8QX4EBsFJpsFAlxLUJcACgkQ8QX4EBsF
JpuIGRAAtHXuDQqmJK+fqKiMYrzRE7aXkX/pis7z7F5nncPWfHpaMFKFMHeAu4/d
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2oInMsB37iBj5/Q/ShO8Km2hz7HJ/zNyW5ljFTYwTKzNiPBcGdswMLu4vj0ALfIF
OHwUeHj+M6i5UqnP0HiRBSHeFWo9it6RSXEd+lfVNbn46VJZ3zkNUFDqkWeJOWgs
o3N781lCdRbcn/P3V+k2CkQhVqjGPb/MgxUyQAreup8fcwBcDiDkj7wNnnUETVuS
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KNjue1eP0KY5bO4+64hnqbCpeVpJiaQjkw+uCTmLz7u7tBME1rt7D+3D0PizXENN
NNkLc4XNl4ouKti3Yhkx0P4TAy/QIDR15M0eSSikHJI8PehqnRU=
=V+xr
-END PGP SIGNATURE-

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Re: [Wikitech-l] The mw.ext construct in lua modules

[Thiemo Kreuz]

I meant half a decade. Thanks for assuming good faith.

> You use naming schemes to avoid name clashes […]

This is by far not the only reason to have a naming scheme. Probably
the least interesting one.

I don't think it makes sense for me to continue contributing to this
conversation, since the proposal we are discussing appears to be based
on that argument alone.

Kind regards
Thiemo

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Re: [Wikitech-l] The mw.ext construct in lua modules

[John Erling Blad]

Half a century? 50 years? You have been working for WMDE since 2014.
Perhaps it would be an idea to discuss the naming scheme instead of
doing questionable call to authority?

The interesting point is _what_ to gain by adding unrelated character
sequences to names. If some character sequence don't convey any
meaningful or important information, then don't add it. It is only
adding noise. You use naming schemes to avoid name clashes, but if the
context has some inherent properties that block name clashes, then
don't add some random character sequences to minimize a chance for
name clash that is already zero.

What extension could a preloaded library possibly clash with? Such an
extension must be written for Mediawiki, and included in Scribunto,
without having an extension page at mediaiwki.org. Maintained outside
Phabricator/Gerrit, yes, but without an extension page? Does that even
make sense?

I make up my own mind, and if I wanted to quote somebody else I would
have done so.

On Fri, Jan 25, 2019 at 2:39 PM Thiemo Kreuz  wrote:
>
> "How it should be done" according to whom? This might be a dumb
> question, but I had the impression you are speaking for a larger group
> of people in your initial post. I would like to understand the context
> better in which the proposed standard came to be.
>
> Personally, I don't support the idea of an open-for-everything
> "mw.randomStuff" naming scheme. It's half a century that I'm actively
> working with code that contains the sequence "mw." literally thousands
> of times: https://codesearch.wmflabs.org/search/?q=%5Cbmw%5C.%5Cb.
> After all these years my expectation is that stuff is only put
> directly in the "mw." namespace when it is general purpose utility
> stuff. And people are even trying to reduce this.
>
> I understand that "mw.ext." is not terribly different from using "mw."
> directly. Both are places for all kinds of unrelated random stuff. But
> I believe it is still useful to have both: "mw." exclusively for
> random stuff that is part of MediaWiki itself, and a different one for
> community code.
>
> Kind regards
> Thiemo
>
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Re: [Wikitech-l] The mw.ext construct in lua modules

[Thiemo Kreuz]

"How it should be done" according to whom? This might be a dumb
question, but I had the impression you are speaking for a larger group
of people in your initial post. I would like to understand the context
better in which the proposed standard came to be.

Personally, I don't support the idea of an open-for-everything
"mw.randomStuff" naming scheme. It's half a century that I'm actively
working with code that contains the sequence "mw." literally thousands
of times: https://codesearch.wmflabs.org/search/?q=%5Cbmw%5C.%5Cb.
After all these years my expectation is that stuff is only put
directly in the "mw." namespace when it is general purpose utility
stuff. And people are even trying to reduce this.

I understand that "mw.ext." is not terribly different from using "mw."
directly. Both are places for all kinds of unrelated random stuff. But
I believe it is still useful to have both: "mw." exclusively for
random stuff that is part of MediaWiki itself, and a different one for
community code.

Kind regards
Thiemo

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Re: [Wikitech-l] The mw.ext construct in lua modules

[John Erling Blad]

It is a description of how it should be done, which is not according
to the current page. Yes it is a call for feedback if I must spell it
out.

On Fri, Jan 25, 2019 at 8:33 AM Thiemo Kreuz  wrote:
>
> Is there a question assigned with this long email? Is this a call for 
> feedback?
>
> Kind regards
> Thiemo
>
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Re: [Wikitech-l] The mw.ext construct in lua modules

[Thiemo Kreuz]

Is there a question assigned with this long email? Is this a call for feedback?

Kind regards
Thiemo

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[Wikitech-l] The mw.ext construct in lua modules

[John Erling Blad]

At the Extension:Scribunto/Lua reference manual, at several places,[1]
it is pointed out that the lua-libs should use the form 'mw.ext.NAME'.
This creates visual noise in the code. Any lib included should have a
extension page, thus it has already been given an unique name. In
addition, only the libraries that need to be preloaded are added to
the mw-structure, and those are the extensions. The ext-addition is
like saying "this is an extension and it is only extensions that needs
to be added to the mw-struct so we make it abundantly clear that this
is an extension".

The only cases where a name can collide is if some external lib is
included, that external lib has the same name as an extension, and if
someone in addition preloads the external lib. The chance is quite
frankly pretty slim, as there are rather few external libs that makes
sense to preload in this environment, especially as preloading imply
some kind of interaction with the environment. That means it is an
extension.

I guess I'm stepping on some toes here…

So to make it abundantly clear, not 'mw.ext.NAME' (or 'mw.ext.NaMe',
or 'mw.ext.name') but 'mw.name' (lowercase, not camelcase). If the
call is a constructor or some kind of builder interface, then
'mw.name(…)' is totally valid. I do not believe it is wise to turn the
lib into an instance by the call, but it can return an instance, it
can cache previously returned instances, and it can somehow install
the instance(s) in the current environment.

An extension should have any pure root libs at 'pure/name.lua' and
additional libs at 'pure/name/additional.lua', where 'pure' is
resolved in the 'ScribuntoExternalLibraries' hook.

[1] 
https://www.mediawiki.org/wiki/Extension:Scribunto/Lua_reference_manual#Extension_libraries_(mw.ext)

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