]>

bradley.meck@gmail.com

Mozilla

linuxwolf+ietf@outer-planes.net

ART DISPATCH Internet-Draft 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”. 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.

This document updates the existing media types for the ECMAScript programming language. It supersedes the media types registrations in for “application/javascript” and “text/javascript”.

In order to formalize support for modular programs 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 . 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 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.

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 .

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 . Finally, the 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.

application ecmascript none charset, see section 4.1 of . goal, declares the goal symbol within to be used while parsing. Encoding is host dependent with differences in byte order marks, the charset parameter, and text preprocessing. See section 5 of . See notes in various sections of . This media type does not specify the grammar of used when missing the goal parameter. [[RFCXXXX]] Script interpreters as discussed in . n/a .js, .mjs TEXT See Author’s Address section. OBSOLETE The file extension .mjs must be parsed using the Module grammar of See Author’s Address section. IESG <iesg@ietf.org>

application javascript none charset, see section 4.1 of . goal, declares the goal symbol within to be used while parsing. Encoding is host dependent with differences in byte order marks, the charset parameter, and text preprocessing. See section 5 of . See notes in various sections of . This media type does not specify the grammar of used when missing the goal parameter. [[RFCXXXX]] Script interpreters as discussed in . n/a .js, .mjs TEXT See Author’s Address section. OBSOLETE The file extension .mjs must be parsed using the Module grammar of See Author’s Address section. IESG <iesg@ietf.org>.

application x-ecmascript none charset, see section 4.1 of . goal, declares the goal symbol within to be used while parsing. Encoding is host dependent with differences in byte order marks, the charset parameter, and text preprocessing. See section 5 of . See notes in various sections of . This media type does not specify the grammar of used when missing the goal parameter. [[RFCXXXX]] Script interpreters as discussed in . n/a .js, .mjs TEXT See Author’s Address section. OBSOLETE The file extension .mjs must be parsed using the Module grammar of See Author’s Address section. IESG <iesg@ietf.org>

application x-javascript none charset, see section 4.1 of . goal, declares the goal symbol within to be used while parsing. Encoding is host dependent with differences in byte order marks, the charset parameter, and text preprocessing. See section 5 of . See notes in various sections of . This media type does not specify the grammar of used when missing the goal parameter. [[RFCXXXX]] Script interpreters as discussed in . n/a .js, .mjs TEXT See Author’s Address section. OBSOLETE The file extension .mjs must be parsed using the Module grammar of See Author’s Address section. IESG <iesg@ietf.org>

text ecmascript none charset, see section 4.1 of . goal, declares the goal symbol within to be used while parsing. Encoding is host dependent with differences in byte order marks, the charset parameter, and text preprocessing. See section 5 of . See notes in various sections of . This media type does not specify the grammar of used when missing the goal parameter. [[RFCXXXX]] Script interpreters as discussed in . n/a .js, .mjs TEXT See Author’s Address section. OBSOLETE The file extension .mjs must be parsed using the Module grammar of See Author’s Address section. IESG <iesg@ietf.org>

text javascript none charset, see section 4.1 of . goal, declares the goal symbol within to be used while parsing. Encoding is host dependent with differences in byte order marks, the charset parameter, and text preprocessing. See section 5 of . See notes in various sections of . This media type does not specify the grammar of used when missing the goal parameter. [[RFCXXXX]] Script interpreters as discussed in . n/a .js, .mjs TEXT See Author’s Address section. COMMON The file extension .mjs must be parsed using the Module grammar of See Author’s Address section. IESG <iesg@ietf.org>

text javascript1.0 none charset, see section 4.1 of . goal, declares the goal symbol within to be used while parsing. Encoding is host dependent with differences in byte order marks, the charset parameter, and text preprocessing. See section 5 of . See notes in various sections of . This media type does not specify the grammar of used when missing the goal parameter. [[RFCXXXX]] Script interpreters as discussed in . n/a .js, .mjs TEXT See Author’s Address section. OBSOLETE The file extension .mjs must be parsed using the Module grammar of See Author’s Address section. IESG <iesg@ietf.org>

text javascript1.1 none charset, see section 4.1 of . goal, declares the goal symbol within to be used while parsing. Encoding is host dependent with differences in byte order marks, the charset parameter, and text preprocessing. See section 5 of . See notes in various sections of . This media type does not specify the grammar of used when missing the goal parameter. [[RFCXXXX]] Script interpreters as discussed in . n/a .js, .mjs TEXT See Author’s Address section. OBSOLETE The file extension .mjs must be parsed using the Module grammar of See Author’s Address section. IESG <iesg@ietf.org>

text javascript1.2 none charset, see section 4.1 of . goal, declares the goal symbol within to be used while parsing. Encoding is host dependent with differences in byte order marks, the charset parameter, and text preprocessing. See section 5 of . See notes in various sections of . This media type does not specify the grammar of used when missing the goal parameter. [[RFCXXXX]] Script interpreters as discussed in . n/a .js, .mjs TEXT See Author’s Address section. OBSOLETE The file extension .mjs must be parsed using the Module grammar of See Author’s Address section. IESG <iesg@ietf.org>

text javascript1.3 none charset, see section 4.1 of . goal, declares the goal symbol within to be used while parsing. Encoding is host dependent with differences in byte order marks, the charset parameter, and text preprocessing. See section 5 of . See notes in various sections of . This media type does not specify the grammar of used when missing the goal parameter. [[RFCXXXX]] Script interpreters as discussed in . n/a .js, .mjs TEXT See Author’s Address section. OBSOLETE The file extension .mjs must be parsed using the Module grammar of See Author’s Address section. IESG <iesg@ietf.org>

text javascript1.4 none charset, see section 4.1 of . goal, declares the goal symbol within to be used while parsing. Encoding is host dependent with differences in byte order marks, the charset parameter, and text preprocessing. See section 5 of . See notes in various sections of . This media type does not specify the grammar of used when missing the goal parameter. [[RFCXXXX]] Script interpreters as discussed in . n/a .js, .mjs TEXT See Author’s Address section. OBSOLETE The file extension .mjs must be parsed using the Module grammar of See Author’s Address section. IESG <iesg@ietf.org>

text javascript1.5 none charset, see section 4.1 of . goal, declares the goal symbol within to be used while parsing. Encoding is host dependent with differences in byte order marks, the charset parameter, and text preprocessing. See section 5 of . See notes in various sections of . This media type does not specify the grammar of used when missing the goal parameter. [[RFCXXXX]] Script interpreters as discussed in . n/a .js, .mjs TEXT See Author’s Address section. OBSOLETE The file extension .mjs must be parsed using the Module grammar of See Author’s Address section. IESG <iesg@ietf.org>

text jscript none charset, see section 4.1 of . goal, declares the goal symbol within to be used while parsing. Encoding is host dependent with differences in byte order marks, the charset parameter, and text preprocessing. See section 5 of . See notes in various sections of . This media type does not specify the grammar of used when missing the goal parameter. [[RFCXXXX]] Script interpreters as discussed in . n/a .js, .mjs TEXT See Author’s Address section. OBSOLETE The file extension .mjs must be parsed using the Module grammar of See Author’s Address section. IESG <iesg@ietf.org>

text livescript none charset, see section 4.1 of . goal, declares the goal symbol within to be used while parsing. Encoding is host dependent with differences in byte order marks, the charset parameter, and text preprocessing. See section 5 of . See notes in various sections of . This media type does not specify the grammar of used when missing the goal parameter. [[RFCXXXX]] Script interpreters as discussed in . n/a .js, .mjs TEXT See Author’s Address section. OBSOLETE The file extension .mjs must be parsed using the Module grammar of See Author’s Address section. IESG <iesg@ietf.org>

text x-ecmascript none charset, see section 4.1 of . goal, declares the goal symbol within to be used while parsing. Encoding is host dependent with differences in byte order marks, the charset parameter, and text preprocessing. See section 5 of . See notes in various sections of . This media type does not specify the grammar of used when missing the goal parameter. [[RFCXXXX]] Script interpreters as discussed in . n/a .js, .mjs TEXT See Author’s Address section. OBSOLETE The file extension .mjs must be parsed using the Module grammar of See Author’s Address section. IESG <iesg@ietf.org>

text x-javascript none charset, see section 4.1 of . goal, declares the goal symbol within to be used while parsing. Encoding is host dependent with differences in byte order marks, the charset parameter, and text preprocessing. See section 5 of . See notes in various sections of . This media type does not specify the grammar of used when missing the goal parameter. [[RFCXXXX]] Script interpreters as discussed in . n/a .js, .mjs TEXT See Author’s Address section. OBSOLETE The file extension .mjs must be parsed using the Module grammar of See Author’s Address section. IESG <iesg@ietf.org>

&RFC4329; &RFC2119; &RFC3023; Ecma International WHATWG TC39

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.