Add docs: Using only a subset of languages with Node/npm

[vladshcherbin]

If you install the package from npm, the built file has all languages.

How is it possible to use only some languages?

[isagalaev]

Sure. You can pass languageSubset as a parameter for highlightAuto(): http://highlightjs.readthedocs.io/en/latest/api.html#highlightauto-value-languagesubset

[Remo]

@isagalaev but that will not exclude the files from the packed JavaScript file or am I missing something?

in index.js we have a ton of calls to require:

var hljs = require('./highlight');

hljs.registerLanguage('1c', require('./languages/1c'));
hljs.registerLanguage('abnf', require('./languages/abnf'));
...

As far as I understand we can just avoid index.js and include highlight.js directly and then call registerLanguage for the languages we actually need?

[Remo]

Here's my complete example which is working for me

var hljs = require("highlight.js/lib/highlight.js");
hljs.registerLanguage('xml', require('highlight.js/lib/languages/xml'));
hljs.registerLanguage('sql', require('highlight.js/lib/languages/sql'));

[danoc]

Thanks, @Remo. This was incredibly helpful. Would love to see it documented on the website or README.

[joshgoebel]

This is in the README now.