See https://github.com/tc39/ecma262. This proposal is currently at stage one. To find out more about what that means, read the process document <https://docs.google.com/document/d/1QbEE0BsO4lvl7NFTn5WXWeiEIBfaVUF7Dk0hpPpPDzU> .
On Wed, Apr 22, 2015 at 8:15 AM, Jussi Kalliokoski < jussi.kallioko...@gmail.com> wrote: > I just noticed that Babel support trailing commas in function arguments > lists, imports and destructuring as well: > > > http://babeljs.io/repl/#?experimental=true&evaluate=true&loose=false&spec=false&code=import%20%7B%0A%20%20voo%2C%0A%20%20doo%2C%0A%7D%20from%20%22.%2Fdat.js%22%3B%0A%0Alet%20%7B%0A%20%20x%2C%0A%20%20y%2C%0A%7D%20%3D%20voo%3B%0A%0Alet%20%5B%0A%20%20z%2C%0A%20%20m%2C%0A%5D%20%3D%20doo%3B%0A%0Afunction%20qoo%20(%0A%20%20x%2C%0A%20%20y%2C%0A)%20%7B%7D > > Is this correct behavior? I'm not > > FWIW as I already use trailing commas object and array literals for better > diffs, I really like this feature as it comes in handy especially in > function signatures where you define types (TypeScript/flow style > annotations), for example: > > function sort <T> ( > array : Array<T>, > compareFn : ((left: T, right: T) => number), > ) : Array<T> { > ... > } > > as well as import statements for modules that declare constants: > > import { > BRAND_COLOR, > DEFAULT_TEXT_COLOR, > DARK_GRAY, > LIGHT_GRAY, > } from "./constants/COLORS"; > > not to mention "options object" style function signatures: > > class Person { > constructor ({ > firstName, > lastName, > birthDate, > country, > city, > zipCode, > }) { > this.firstName = firstName; > this.lastName = lastName; > this.birthDate = birthDate; > this.country = country; > this.city = city; > this.zipCode = zipCode; > } > } > > To me, the spec language as per Jason's HTML version looks like at least > for destructuring this is supported, but at least I can't read the spec to > allow trailing commas in function signatures. At least this doesn't seem to > be incorporated into the spec: > > https://esdiscuss.org/notes/2014-09/trailing_comma_proposal.pdf > > Is the proposal still on track for ES7 and am I correct in my reading of > the destructuring allowing trailing commas? > > _______________________________________________ > es-discuss mailing list > es-discuss@mozilla.org > https://mail.mozilla.org/listinfo/es-discuss > > -- Shape Security is hiring outstanding individuals. Check us out at *https://shapesecurity.com/jobs/ <https://shapesecurity.com/jobs/>*
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