[issue31715] Add mimetype for extension .mjs

[Ned Deily]

Ned Deily  added the comment:


New changeset 25ee15a15c2d274afeea2dc5a0a0b4fb4bea904b by Ned Deily (Myles 
Borins) in branch '3.7':
[3.7] bpo-31715 Add mimetype for extension .mjs (GH-3908) (GH-10977)
https://github.com/python/cpython/commit/25ee15a15c2d274afeea2dc5a0a0b4fb4bea904b


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[issue31715] Add mimetype for extension .mjs

[Ned Deily]

Change by Ned Deily :


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versions: +Python 2.7, Python 3.6, Python 3.7

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[issue31715] Add mimetype for extension .mjs

[Ned Deily]

Ned Deily  added the comment:


New changeset d9a2aca839b1326e011ecca17ba7b45123c47a64 by Ned Deily (Myles 
Borins) in branch '2.7':
[2.7] bpo-31715 Add mimetype for extension .mjs (GH-3908) (GH-10978)
https://github.com/python/cpython/commit/d9a2aca839b1326e011ecca17ba7b45123c47a64


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[issue31715] Add mimetype for extension .mjs

[Ned Deily]

Ned Deily  added the comment:


New changeset 70db385944ecf2ceed10ed7d91fce68399f9ca8a by Ned Deily (Myles 
Borins) in branch '3.6':
[3.6] bpo-31715 Add mimetype for extension .mjs (GH-3908) (GH-10976)
https://github.com/python/cpython/commit/70db385944ecf2ceed10ed7d91fce68399f9ca8a


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[issue31715] Add mimetype for extension .mjs

[Ned Deily]

Ned Deily  added the comment:


New changeset c7b7a43cd8964a90669bb37735cdafc5b0ec60cc by Ned Deily (Myles 
Borins) in branch '3.7':
[3.7] bpo-31715 Add mimetype for extension .mjs (GH-3908) (GH-10977)
https://github.com/python/cpython/commit/c7b7a43cd8964a90669bb37735cdafc5b0ec60cc


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[issue31715] Add mimetype for extension .mjs

[Myles Borins]

Myles Borins  added the comment:

Thanks for chiming in R. David Murray

> Think of the absence of the mimetype rule as a bug, rather than its presence 
> as a feature.

Very much appreciate this sentiment.

I've opened backports to simplify the process if y'all decide to approve.

2.7: https://github.com/python/cpython/pull/10978
3.6: https://github.com/python/cpython/pull/10976
3.7: https://github.com/python/cpython/pull/10977

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[issue31715] Add mimetype for extension .mjs

[Myles Borins]

Change by Myles Borins :


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pull_requests: +10219

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[issue31715] Add mimetype for extension .mjs

[Myles Borins]

Change by Myles Borins :


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pull_requests: +10218

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[issue31715] Add mimetype for extension .mjs

[Myles Borins]

Change by Myles Borins :


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pull_requests: +10217

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[issue31715] Add mimetype for extension .mjs

[R. David Murray]

R. David Murray  added the comment:

We have generally made an exception to the "new feature" rule for mimetypes.  
That is, we don't really consider a mimetype addition to be a new feature in 
the sense that our backward compatibility rules mean.  It is true that an 
application could work on x.y.z and break on x.y.z-1, but this isn't because an 
*API* present in x.y.z is not there in x.y.z-1.  is more akin to a bugfix (it 
threw an exception before, now it works).  Think of the absence of the mimetype 
rule as a bug, rather than its presence as a feature.

And yes, this is a policy evolution.  This way of looking at mimetypes changes 
has been in effect formaybe five years now?...and before that we treated 
them as features.  But then, too, before that we required there be an actual 
IANA accepted RFC, but that requirement too has had to evolve as mimetype 
management became more decentralized.

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[issue31715] Add mimetype for extension .mjs

[Dustin Ingram]

Change by Dustin Ingram :


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nosy: +di

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[issue31715] Add mimetype for extension .mjs

[Myles Borins]

Myles Borins  added the comment:

Also wanted to point out some prior art of a mimetype (json) being backported 
to all active runtimes

https://bugs.python.org/issue30824#msg297527

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[issue31715] Add mimetype for extension .mjs

[Myles Borins]

Myles Borins  added the comment:

Thanks for cc'ing the other folks. I help run the Node.js release + LTS team... 
so I 100% understand the balance necessary to keep a stable API. In this 
particular case I would gauge that this has a near 0 case for breakage, but 
leaving it unpatched has a high risk of breaking user expectations

https://github.com/search?q=extension%3Amjs+function=Code

This is a really heavy handed search against github showing 13k+ files with the 
.mjs extension that include the word "function"

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[issue31715] Add mimetype for extension .mjs

[Andrew Svetlov]

Andrew Svetlov  added the comment:

Christian Heimes is right: it is a new feature, not a bug fix. 
I regret too often when I cannot backport a brilliant patch to old Python 
version but this is the price of API stability.

You can try to convince release managers (Benjamin and Ned, I've added you to 
nosy list) but I suspect you'll get a rejection.

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nosy: +benjamin.peterson, ned.deily

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[issue31715] Add mimetype for extension .mjs

[Myles Borins]

Myles Borins  added the comment:

There are a number of tutorials that suggest using the .mjs extension for 
working with ESM modules for front end development.

https://developers.google.com/web/fundamentals/primers/modules 

https://hacks.mozilla.org/2018/03/es-modules-a-cartoon-deep-dive/ 


There are many tutorials that suggest web developers use `python -m 
SimpleHTTPServer` as a way to spin up a quick development server.  If a .mjs 
file is not served with the correct mime type 

 the browser will throw when trying to load the module, and the error is not 
the most obvious if developers are not aware of what mime types even are.

As such I would like propose that this is a bug fix, rather than a feature, as 
popular browser workflow is going to be broken without an obvious way to fix it 
for anyone using python right now.

> On Dec 5, 2018, at 2:23 PM, Christian Heimes  wrote:
> 
> 
> Christian Heimes  added the comment:
> 
> It's technically a new feature. New features are not added to existing 
> releases unless there is a very compelling reason.
> 
> --
> nosy: +christian.heimes
> 
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[issue31715] Add mimetype for extension .mjs

[Christian Heimes]

Christian Heimes  added the comment:

It's technically a new feature. New features are not added to existing releases 
unless there is a very compelling reason.

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nosy: +christian.heimes

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[issue31715] Add mimetype for extension .mjs

[Myles Borins]

Myles Borins  added the comment:

I see that when this landed it appears that it was removed from landing on 
"Python 2.7, Python 3.6, Python 3.7".

Is there any chance to revisit this decision? I dug into the mimetype code and 
it doesn't appear that there is a way to rely on operating system mimetypes for 
systems aside from Windows... as such this is going to be a fairly large 
experience gap for people developing front-end applications that utilize the 
file extension on any version other than 3.8, which will likely take quite a 
while to be distributed as a default in various OS distributions.

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[issue31715] Add mimetype for extension .mjs

[Andrew Svetlov]

Change by Andrew Svetlov :


--
resolution:  -> fixed
stage: patch review -> resolved
status: open -> closed
versions:  -Python 2.7, Python 3.6, Python 3.7

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[issue31715] Add mimetype for extension .mjs

[Andrew Svetlov]

Andrew Svetlov  added the comment:


New changeset 0854b92cd25613269d21de3cb5239379ddc0f2fb by Andrew Svetlov 
(Bradley Meck) in branch 'master':
bpo-31715 Add mimetype for extension .mjs (#3908)
https://github.com/python/cpython/commit/0854b92cd25613269d21de3cb5239379ddc0f2fb


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nosy: +asvetlov

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[issue31715] Add mimetype for extension .mjs

[Mariatta Wijaya]

Change by Mariatta Wijaya :


--
nosy: +barry, r.david.murray

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[issue31715] Add mimetype for extension .mjs

[Bradley Meck]

Change by Bradley Meck :


--
keywords: +patch
pull_requests: +3879
stage:  -> patch review

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[issue31715] Add mimetype for extension .mjs

[Bradley Meck]

New submission from Bradley Meck :

I propose to add a mapping of file extension .mjs to mime type 
"text/javascript".
The "text/javascript" MIME is registered in 
https://www.iana.org/assignments/media-types, was moved to *should* as the MIME 
in HTML ( https://github.com/whatwg/html/pull/3096), and is being updated by 
https://datatracker.ietf.org/doc/draft-bfarias-javascript-mjs/

This extension is being used by Node.js for support of ECMAScript Modules (ESM).

--
components: Library (Lib)
messages: 303824
nosy: Bradley Meck
priority: normal
severity: normal
status: open
title: Add mimetype for extension .mjs
type: enhancement
versions: Python 2.7, Python 3.6, Python 3.7, Python 3.8

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