Internet DRAFT - draft-bfarias-javascript-mjs
draft-bfarias-javascript-mjs
Network Working Group B. Farias
Internet-Draft
Updates: 4329 (if approved) M. Miller
Intended status: Informational Mozilla
Expires: February 24, 2018 August 23, 2017
ECMAScript Media Types Updates
draft-bfarias-javascript-mjs-01
Abstract
This document proposes updates to the ECMAScript media types,
superseding the existing registrations for "application/javascript"
and "text/javascript" by adding an additional extension and removing
usage warnings. This document updates RFC4329, "Scripting Media
Types".
Note to Readers
The issues list for this draft can be found at
https://github.com/bmeck/I-D/labels/javascript-mjs.
The most recent (often, unpublished) draft is at
https://github.com/bmeck/I-D/tree/master/javascript-mjs.
Recent changes are listed at https://github.com/bmeck/I-
D/commits/master/javascript-mjs.
Status of This Memo
This Internet-Draft is submitted in full conformance with the
provisions of BCP 78 and BCP 79.
Internet-Drafts are working documents of the Internet Engineering
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material or to cite them other than as "work in progress."
This Internet-Draft will expire on February 24, 2018.
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Copyright Notice
Copyright (c) 2017 IETF Trust and the persons identified as the
document authors. All rights reserved.
This document is subject to BCP 78 and the IETF Trust's Legal
Provisions Relating to IETF Documents
(http://trustee.ietf.org/license-info) in effect on the date of
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described in the Simplified BSD License.
Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2
2. Background . . . . . . . . . . . . . . . . . . . . . . . . . 2
3. Notational Conventions . . . . . . . . . . . . . . . . . . . 3
4. Registration . . . . . . . . . . . . . . . . . . . . . . . . 3
4.1. text/javascript . . . . . . . . . . . . . . . . . . . . . 3
4.2. application/javascript . . . . . . . . . . . . . . . . . 4
5. References . . . . . . . . . . . . . . . . . . . . . . . . . 5
5.1. Normative References . . . . . . . . . . . . . . . . . . 5
5.2. Informative References . . . . . . . . . . . . . . . . . 5
Appendix A. Acknowledgements . . . . . . . . . . . . . . . . . . 6
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 6
1. Introduction
This document updates the existing media types for the ECMAScript
programming language. It supersedes the media types registrations in
[RFC4329] for "application/javascript" and "text/javascript".
2. Background
In order to formalize support for modular programs [ECMA-262] now
defines two top-level goal symbols for the ECMAScript grammar. This
means that (in the absence of additional information) there are two
possible interpretations for any given ECMAScript Source Text. The
TC39 standards body for ECMAScript has determined that media types
are outside of their scope of work [TC39-MIME-ISSUE].
It is not possible to fully determine if a Source Text of ECMAScript
is meant to be parsed in the Module or Script grammar goals based
upon content alone. Therefore, scripting environments must use out
of band information in order to determine what goal a Source Text
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should be treated as. To this end some scripting environments have
chosen to adopt a new file extension of .mjs for determining the goal
of a given Source Text.
3. Notational Conventions
The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
"SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
document are to be interpreted as described in [RFC2119].
4. Registration
The ECMAScript media types are to be updated to point to a non-vendor
specific standard undated specification of ECMAScript. In addition,
a new file extension of .mjs is to be added to the list of file
extensions with the restriction that it must correspond to the Module
grammar of [ECMA-262]. Finally, the [HTML] specification is using
text/javascript as the default media type of ECMAScript when
preparing script tags; therefore, text/javascript has been moved
intended usage from OBSOLETE to COMMON.
4.1. text/javascript
Type name: text
Subtype name: javascript
Required parameters: none
Optional parameters: charset, see section 4.1 of [RFC4329].
Encoding considerations: The same as the considerations in section
3.1 of [RFC3023].
Security considerations: See section 5 of [RFC4329].
Interoperability considerations: See notes in various sections of
[RFC4329]. This media type does not specify the grammar of
[ECMA-262] used.
Published specification: [[RFCXXXX]]
Applications which use this media type: Script interpreters as
discussed in [RFC4329].
Additional information:
Magic number(s): n/a
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File extension(s): .js, .mjs
Macintosh File Type Code(s): TEXT
Person & email address to contact for further information: See
Author's Address section.
Intended usage: COMMON
Restrictions on usage: The file extension .mjs must be parsed using
the Module grammar of [ECMA-262]
Author: See Author's Address section.
Change controller: IESG <iesg@ietf.org>
4.2. application/javascript
Type name: application
Subtype name: javascript
Required parameters: none
Optional parameters: charset, see section 4.1 of [RFC4329].
Encoding considerations: The same as the considerations in section
3.2 of [RFC3023].
Security considerations: See section 5 of [RFC4329].
Interoperability considerations: See notes in various sections of
[RFC4329]. This media type does not specify the grammar of
[ECMA-262] used.
Published specification: [[RFCXXXX]]
Applications which use this media type: Script interpreters as
discussed in [RFC4329].
Additional information:
Magic number(s): n/a
File extension(s): .js, .mjs
Macintosh File Type Code(s): TEXT
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Person & email address to contact for further information: See
Author's Address section.
Intended usage: COMMON
Restrictions on usage: The file extension .mjs must be parsed using
the Module grammar of [ECMA-262]
Author: See Author's Address section.
Change controller: IESG <iesg@ietf.org>.
5. References
5.1. Normative References
[ECMA-262]
Ecma International, "Standard ECMA-262: ECMAScript
Language Specification", August 2017, <http://www.ecma-
international.org/publications/standards/Ecma-262.htm>.
[RFC2119] Bradner, S., "Key words for use in RFCs to Indicate
Requirement Levels", BCP 14, RFC 2119,
DOI 10.17487/RFC2119, March 1997,
<http://www.rfc-editor.org/info/rfc2119>.
[RFC3023] Murata, M., St. Laurent, S., and D. Kohn, "XML Media
Types", RFC 3023, DOI 10.17487/RFC3023, January 2001,
<http://www.rfc-editor.org/info/rfc3023>.
[RFC4329] Hoehrmann, B., "Scripting Media Types", RFC 4329,
DOI 10.17487/RFC4329, April 2006,
<http://www.rfc-editor.org/info/rfc4329>.
5.2. Informative References
[HTML] WHATWG, "HTML Living Standard", August 2017,
<https://html.spec.whatwg.org/multipage/
scripting.html#prepare-a-script>.
[TC39-MIME-ISSUE]
TC39, "Add `application/javascript+module` mime to remove
ambiguity5", August 2017, <https://web.archive.org/web/201
70814193912/https://github.com/tc39/ecma262/issues/322>.
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Appendix A. Acknowledgements
Thanks to Suresh Krishnan, Alexey Melnikov, Mark Nottingham, James
Snell, Matthew A. Miller, Adam Roach, and Allen Wirfs-Brock for
guiding me through this process.
Authors' Addresses
Bradley Farias
Email: bradley.meck@gmail.com
Matthew A. Miller
Mozilla
Email: linuxwolf+ietf@outer-planes.net
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